diff --git a/core/package-lock.json b/core/package-lock.json
index 46b6556f6e..e145ff8962 100644
--- a/core/package-lock.json
+++ b/core/package-lock.json
@@ -203,9 +203,9 @@
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@@ -1761,7 +1681,7 @@
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@@ -1977,7 +1897,7 @@
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+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.3.tgz",
+      "integrity": "sha512-63ZOUnL4SIXj4L0NixR3L1lcjO38crAbgrTpl28t8jjrfuiOBL5Iygm+60qPs/KsZGzPNg6Smnc/oY16QTjF0g==",
       "dev": true,
       "requires": {
-        "spdx-correct": "1.0.2",
-        "spdx-expression-parse": "1.0.4"
+        "spdx-correct": "3.0.0",
+        "spdx-expression-parse": "3.0.0"
       }
     },
     "verror": {
@@ -11563,21 +11149,12 @@
       "dev": true
     },
     "worker-farm": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.5.2.tgz",
-      "integrity": "sha512-XxiQ9kZN5n6mmnW+mFJ+wXjNNI/Nx4DIdaAKLX1Bn6LYBWlN/zaBhu34DQYPZ1AJobQuu67S2OfDdNSVULvXkQ==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.6.0.tgz",
+      "integrity": "sha512-6w+3tHbM87WnSWnENBUvA2pxJPLhQUg5LKwUQHq3r+XPhIM+Gh2R5ycbwPCyuGbNg+lPgdcnQUhuC02kJCvffQ==",
       "dev": true,
       "requires": {
-        "errno": "0.1.7",
-        "xtend": "4.0.1"
-      },
-      "dependencies": {
-        "xtend": {
-          "version": "4.0.1",
-          "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-          "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
-          "dev": true
-        }
+        "errno": "0.1.7"
       }
     },
     "wrap-ansi": {
@@ -11711,11 +11288,26 @@
           "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
           "dev": true,
           "requires": {
-            "lru-cache": "4.1.1",
+            "lru-cache": "4.1.2",
             "shebang-command": "1.2.0",
             "which": "1.3.0"
           }
         },
+        "execa": {
+          "version": "0.7.0",
+          "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz",
+          "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=",
+          "dev": true,
+          "requires": {
+            "cross-spawn": "5.1.0",
+            "get-stream": "3.0.0",
+            "is-stream": "1.1.0",
+            "npm-run-path": "2.0.2",
+            "p-finally": "1.0.0",
+            "signal-exit": "3.0.2",
+            "strip-eof": "1.0.0"
+          }
+        },
         "find-up": {
           "version": "2.1.0",
           "resolved": "https://registry.npmjs.org/find-up/-/find-up-2.1.0.tgz",
@@ -11740,23 +11332,6 @@
             "execa": "0.7.0",
             "lcid": "1.0.0",
             "mem": "1.1.0"
-          },
-          "dependencies": {
-            "execa": {
-              "version": "0.7.0",
-              "resolved": "https://registry.npmjs.org/execa/-/execa-0.7.0.tgz",
-              "integrity": "sha1-lEvs00zEHuMqY6n68nrVpl/Fl3c=",
-              "dev": true,
-              "requires": {
-                "cross-spawn": "5.1.0",
-                "get-stream": "3.0.0",
-                "is-stream": "1.1.0",
-                "npm-run-path": "2.0.2",
-                "p-finally": "1.0.0",
-                "signal-exit": "3.0.2",
-                "strip-eof": "1.0.0"
-              }
-            }
           }
         },
         "string-width": {
diff --git a/core/src/components.d.ts b/core/src/components.d.ts
index 22f260ae39..834a0dc373 100644
--- a/core/src/components.d.ts
+++ b/core/src/components.d.ts
@@ -134,8 +134,8 @@ import {
 
 declare global {
   interface HTMLIonActionSheetControllerElement extends HTMLStencilElement {
-    'create': (opts?: ActionSheetOptions) => Promise<HTMLIonActionSheetElement>;
-    'dismiss': (data?: any, role?: string, actionSheetId?: number) => Promise<void>;
+    'create': (opts?: ActionSheetOptions | undefined) => Promise<HTMLIonActionSheetElement>;
+    'dismiss': (data?: any, role?: string | undefined, actionSheetId?: number) => Promise<void>;
     'getTop': () => HTMLIonActionSheetElement;
   }
   var HTMLIonActionSheetControllerElement: {
@@ -174,7 +174,7 @@ declare global {
     /**
      * Dismiss the action sheet overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * If true, the action sheet will be dismissed when the backdrop is clicked. Defaults to `true`.
      */
@@ -195,11 +195,11 @@ declare global {
     /**
      * Returns a promise that resolves when the action-sheet did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await actionSheet.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the action-sheet will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await actionSheet.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * Present the action sheet overlay after it has been created.
@@ -304,8 +304,8 @@ declare global {
 
 declare global {
   interface HTMLIonAlertControllerElement extends HTMLStencilElement {
-    'create': (opts?: AlertOptions) => Promise<HTMLIonAlertElement>;
-    'dismiss': (data?: any, role?: string, alertId?: number) => Promise<void>;
+    'create': (opts?: AlertOptions | undefined) => Promise<HTMLIonAlertElement>;
+    'dismiss': (data?: any, role?: string | undefined, alertId?: number) => Promise<void>;
     'getTop': () => HTMLIonAlertElement;
   }
   var HTMLIonAlertControllerElement: {
@@ -344,7 +344,7 @@ declare global {
     /**
      * Dismiss the alert overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * If true, the alert will be dismissed when the backdrop is clicked. Defaults to `true`.
      */
@@ -374,11 +374,11 @@ declare global {
     /**
      * Returns a promise that resolves when the alert did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await alert.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the alert will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await alert.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * Present the alert overlay after it has been created.
@@ -521,7 +521,7 @@ declare global {
 
 declare global {
   interface HTMLIonAnimationControllerElement extends HTMLStencilElement {
-    'create': (animationBuilder?: AnimationBuilder, baseEl?: any, opts?: any) => Promise<Animation>;
+    'create': (animationBuilder?: AnimationBuilder | undefined, baseEl?: any, opts?: any) => Promise<Animation>;
   }
   var HTMLIonAnimationControllerElement: {
     prototype: HTMLIonAnimationControllerElement;
@@ -1354,14 +1354,14 @@ declare global {
      * If true, the content will scroll behind the headers and footers. This effect can easily be seen by setting the toolbar to transparent.
      */
     'fullscreen': boolean;
-    'scrollByPoint': (x: number, y: number, duration: number, done?: Function) => Promise<any>;
+    'scrollByPoint': (x: number, y: number, duration: number, done?: Function | undefined) => Promise<any>;
     'scrollEnabled': boolean;
     'scrollEvents': boolean;
     /**
      * Scroll to the bottom of the content component.  Duration of the scroll animation in milliseconds. Defaults to `300`. Returns a promise which is resolved when the scroll has completed.
      */
     'scrollToBottom': (duration?: number) => Promise<void>;
-    'scrollToPoint': (x: number, y: number, duration: number, done?: Function) => Promise<any>;
+    'scrollToPoint': (x: number, y: number, duration: number, done?: Function | undefined) => Promise<any>;
     /**
      * Scroll to the top of the content component.  Duration of the scroll animation in milliseconds. Defaults to `300`. Returns a promise which is resolved when the scroll has completed.
      */
@@ -1436,15 +1436,15 @@ declare global {
     /**
      * Full day of the week names. This can be used to provide locale names for each day in the week. Defaults to English.
      */
-    'dayNames': string[] | string;
+    'dayNames': string[] | string | undefined;
     /**
      * Short abbreviated day of the week names. This can be used to provide locale names for each day in the week. Defaults to English.
      */
-    'dayShortNames': string[] | string;
+    'dayShortNames': string[] | string | undefined;
     /**
      * Values used to create the list of selectable days. By default every day is shown for the given month. However, to control exactly which days of the month to display, the `dayValues` input can take a number, an array of numbers, or a string of comma separated numbers. Note that even if the array days have an invalid number for the selected month, like `31` in February, it will correctly not show days which are not valid for the selected month.
      */
-    'dayValues': number[] | number | string;
+    'dayValues': number[] | number | string | undefined;
     /**
      * If true, the user cannot interact with the datetime. Defaults to `false`.
      */
@@ -1460,35 +1460,35 @@ declare global {
     /**
      * Values used to create the list of selectable hours. By default the hour values range from `0` to `23` for 24-hour, or `1` to `12` for 12-hour. However, to control exactly which hours to display, the `hourValues` input can take a number, an array of numbers, or a string of comma separated numbers.
      */
-    'hourValues': number[] | number | string;
+    'hourValues': number[] | number | string | undefined;
     /**
      * The maximum datetime allowed. Value must be a date string following the [ISO 8601 datetime format standard](https://www.w3.org/TR/NOTE-datetime), `1996-12-19`. The format does not have to be specific to an exact datetime. For example, the maximum could just be the year, such as `1994`. Defaults to the end of this year.
      */
-    'max': string;
+    'max': string | undefined;
     /**
      * The minimum datetime allowed. Value must be a date string following the [ISO 8601 datetime format standard](https://www.w3.org/TR/NOTE-datetime), such as `1996-12-19`. The format does not have to be specific to an exact datetime. For example, the minimum could just be the year, such as `1994`. Defaults to the beginning of the year, 100 years ago from today.
      */
-    'min': string;
+    'min': string | undefined;
     /**
      * Values used to create the list of selectable minutes. By default the mintues range from `0` to `59`. However, to control exactly which minutes to display, the `minuteValues` input can take a number, an array of numbers, or a string of comma separated numbers. For example, if the minute selections should only be every 15 minutes, then this input value would be `minuteValues="0,15,30,45"`.
      */
-    'minuteValues': number[] | number | string;
+    'minuteValues': number[] | number | string | undefined;
     /**
      * Full names for each month name. This can be used to provide locale month names. Defaults to English.
      */
-    'monthNames': string[] | string;
+    'monthNames': string[] | string | undefined;
     /**
      * Short abbreviated names for each month name. This can be used to provide locale month names. Defaults to English.
      */
-    'monthShortNames': string[] | string;
+    'monthShortNames': string[] | string | undefined;
     /**
      * Values used to create the list of selectable months. By default the month values range from `1` to `12`. However, to control exactly which months to display, the `monthValues` input can take a number, an array of numbers, or a string of comma separated numbers. For example, if only summer months should be shown, then this input value would be `monthValues="6,7,8"`. Note that month numbers do *not* have a zero-based index, meaning January's value is `1`, and December's is `12`.
      */
-    'monthValues': number[] | number | string;
+    'monthValues': number[] | number | string | undefined;
     /**
      * The format of the date and time picker columns the user selects. A datetime input can have one or many datetime parts, each getting their own column which allow individual selection of that particular datetime part. For example, year and month columns are two individually selectable columns which help choose an exact date from the datetime picker. Each column follows the string parse format. Defaults to use `displayFormat`.
      */
-    'pickerFormat': string;
+    'pickerFormat': string | undefined;
     /**
      * Any additional options that the picker interface can accept. See the [Picker API docs](../../picker/Picker) for the picker options.
      */
@@ -1496,7 +1496,7 @@ declare global {
     /**
      * The text to display when there's no date selected yet. Using lowercase to match the input attribute
      */
-    'placeholder': string;
+    'placeholder': string | undefined;
     /**
      * the value of the datetime.
      */
@@ -1504,7 +1504,7 @@ declare global {
     /**
      * Values used to create the list of selectable years. By default the year values range between the `min` and `max` datetime inputs. However, to control exactly which years to display, the `yearValues` input can take a number, an array of numbers, or string of comma separated numbers. For example, to show upcoming and recent leap years, then this input's value would be `yearValues="2024,2020,2016,2012,2008"`.
      */
-    'yearValues': number[] | number | string;
+    'yearValues': number[] | number | string | undefined;
   }
   var HTMLIonDatetimeElement: {
     prototype: HTMLIonDatetimeElement;
@@ -1530,15 +1530,15 @@ declare global {
       /**
        * Full day of the week names. This can be used to provide locale names for each day in the week. Defaults to English.
        */
-      'dayNames'?: string[] | string;
+      'dayNames'?: string[] | string | undefined;
       /**
        * Short abbreviated day of the week names. This can be used to provide locale names for each day in the week. Defaults to English.
        */
-      'dayShortNames'?: string[] | string;
+      'dayShortNames'?: string[] | string | undefined;
       /**
        * Values used to create the list of selectable days. By default every day is shown for the given month. However, to control exactly which days of the month to display, the `dayValues` input can take a number, an array of numbers, or a string of comma separated numbers. Note that even if the array days have an invalid number for the selected month, like `31` in February, it will correctly not show days which are not valid for the selected month.
        */
-      'dayValues'?: number[] | number | string;
+      'dayValues'?: number[] | number | string | undefined;
       /**
        * If true, the user cannot interact with the datetime. Defaults to `false`.
        */
@@ -1554,31 +1554,31 @@ declare global {
       /**
        * Values used to create the list of selectable hours. By default the hour values range from `0` to `23` for 24-hour, or `1` to `12` for 12-hour. However, to control exactly which hours to display, the `hourValues` input can take a number, an array of numbers, or a string of comma separated numbers.
        */
-      'hourValues'?: number[] | number | string;
+      'hourValues'?: number[] | number | string | undefined;
       /**
        * The maximum datetime allowed. Value must be a date string following the [ISO 8601 datetime format standard](https://www.w3.org/TR/NOTE-datetime), `1996-12-19`. The format does not have to be specific to an exact datetime. For example, the maximum could just be the year, such as `1994`. Defaults to the end of this year.
        */
-      'max'?: string;
+      'max'?: string | undefined;
       /**
        * The minimum datetime allowed. Value must be a date string following the [ISO 8601 datetime format standard](https://www.w3.org/TR/NOTE-datetime), such as `1996-12-19`. The format does not have to be specific to an exact datetime. For example, the minimum could just be the year, such as `1994`. Defaults to the beginning of the year, 100 years ago from today.
        */
-      'min'?: string;
+      'min'?: string | undefined;
       /**
        * Values used to create the list of selectable minutes. By default the mintues range from `0` to `59`. However, to control exactly which minutes to display, the `minuteValues` input can take a number, an array of numbers, or a string of comma separated numbers. For example, if the minute selections should only be every 15 minutes, then this input value would be `minuteValues="0,15,30,45"`.
        */
-      'minuteValues'?: number[] | number | string;
+      'minuteValues'?: number[] | number | string | undefined;
       /**
        * Full names for each month name. This can be used to provide locale month names. Defaults to English.
        */
-      'monthNames'?: string[] | string;
+      'monthNames'?: string[] | string | undefined;
       /**
        * Short abbreviated names for each month name. This can be used to provide locale month names. Defaults to English.
        */
-      'monthShortNames'?: string[] | string;
+      'monthShortNames'?: string[] | string | undefined;
       /**
        * Values used to create the list of selectable months. By default the month values range from `1` to `12`. However, to control exactly which months to display, the `monthValues` input can take a number, an array of numbers, or a string of comma separated numbers. For example, if only summer months should be shown, then this input value would be `monthValues="6,7,8"`. Note that month numbers do *not* have a zero-based index, meaning January's value is `1`, and December's is `12`.
        */
-      'monthValues'?: number[] | number | string;
+      'monthValues'?: number[] | number | string | undefined;
       /**
        * Emitted when the datetime selection was cancelled.
        */
@@ -1590,7 +1590,7 @@ declare global {
       /**
        * The format of the date and time picker columns the user selects. A datetime input can have one or many datetime parts, each getting their own column which allow individual selection of that particular datetime part. For example, year and month columns are two individually selectable columns which help choose an exact date from the datetime picker. Each column follows the string parse format. Defaults to use `displayFormat`.
        */
-      'pickerFormat'?: string;
+      'pickerFormat'?: string | undefined;
       /**
        * Any additional options that the picker interface can accept. See the [Picker API docs](../../picker/Picker) for the picker options.
        */
@@ -1598,7 +1598,7 @@ declare global {
       /**
        * The text to display when there's no date selected yet. Using lowercase to match the input attribute
        */
-      'placeholder'?: string;
+      'placeholder'?: string | undefined;
       /**
        * the value of the datetime.
        */
@@ -1606,7 +1606,7 @@ declare global {
       /**
        * Values used to create the list of selectable years. By default the year values range between the `min` and `max` datetime inputs. However, to control exactly which years to display, the `yearValues` input can take a number, an array of numbers, or string of comma separated numbers. For example, to show upcoming and recent leap years, then this input's value would be `yearValues="2024,2020,2016,2012,2008"`.
        */
-      'yearValues'?: number[] | number | string;
+      'yearValues'?: number[] | number | string | undefined;
     }
   }
 }
@@ -1987,12 +1987,12 @@ declare global {
 
 declare global {
   interface HTMLIonHideWhenElement extends HTMLStencilElement {
-    'mediaQuery': string;
-    'mode': string;
+    'mediaQuery': string|undefined;
+    'mode': string|undefined;
     'or': boolean;
-    'orientation': string;
-    'platform': string;
-    'size': string;
+    'orientation': string|undefined;
+    'platform': string|undefined;
+    'size': string|undefined;
   }
   var HTMLIonHideWhenElement: {
     prototype: HTMLIonHideWhenElement;
@@ -2011,12 +2011,12 @@ declare global {
   }
   namespace JSXElements {
     export interface IonHideWhenAttributes extends HTMLAttributes {
-      'mediaQuery'?: string;
-      'mode'?: string;
+      'mediaQuery'?: string|undefined;
+      'mode'?: string|undefined;
       'or'?: boolean;
-      'orientation'?: string;
-      'platform'?: string;
-      'size'?: string;
+      'orientation'?: string|undefined;
+      'platform'?: string|undefined;
+      'size'?: string|undefined;
     }
   }
 }
@@ -2829,11 +2829,11 @@ declare global {
     /**
      * Get the [Item Sliding](../../item-sliding/ItemSliding) that is currently opene.
      */
-    'getOpenItem': () => ItemSliding;
+    'getOpenItem': () => ItemSliding | null;
     /**
      * Set an [Item Sliding](../../item-sliding/ItemSliding) as the open item.
      */
-    'setOpenItem': (itemSliding: ItemSliding) => void;
+    'setOpenItem': (itemSliding: ItemSliding | null) => void;
   }
   var HTMLIonListElement: {
     prototype: HTMLIonListElement;
@@ -2860,8 +2860,8 @@ declare global {
 
 declare global {
   interface HTMLIonLoadingControllerElement extends HTMLStencilElement {
-    'create': (opts?: LoadingOptions) => Promise<HTMLIonLoadingElement>;
-    'dismiss': (data?: any, role?: string, loadingId?: number) => Promise<void>;
+    'create': (opts?: LoadingOptions | undefined) => Promise<HTMLIonLoadingElement>;
+    'dismiss': (data?: any, role?: string | undefined, loadingId?: number) => Promise<void>;
     'getTop': () => HTMLIonLoadingElement;
   }
   var HTMLIonLoadingControllerElement: {
@@ -2900,7 +2900,7 @@ declare global {
     /**
      * Dismiss the loading overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * If true, the loading indicator will dismiss when the page changes. Defaults to `false`.
      */
@@ -2925,11 +2925,11 @@ declare global {
     /**
      * Returns a promise that resolves when the loading did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await loading.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the loading will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await loading.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * Present the loading overlay after it has been created.
@@ -3094,34 +3094,34 @@ declare global {
     /**
      * Programatically close the Menu. If no `menuId` is given as the first argument then it'll close any menu which is open. If a `menuId` is given then it'll close that exact menu.
      */
-    'close': (menuId?: string) => Promise<boolean>;
+    'close': (menuId?: string | undefined) => Promise<boolean>;
     'createAnimation': (type: string, menuCmp: Menu) => Promise<Animation>;
     /**
      * Used to enable or disable a menu. For example, there could be multiple left menus, but only one of them should be able to be opened at the same time. If there are multiple menus on the same side, then enabling one menu will also automatically disable all the others that are on the same side.
      */
-    'enable': (shouldEnable: boolean, menuId?: string) => HTMLIonMenuElement;
+    'enable': (shouldEnable: boolean, menuId?: string | undefined) => HTMLIonMenuElement | null;
     /**
      * Used to get a menu instance. If a `menuId` is not provided then it'll return the first menu found. If a `menuId` is `left` or `right`, then it'll return the enabled menu on that side. Otherwise, if a `menuId` is provided, then it'll try to find the menu using the menu's `id` property. If a menu is not found then it'll return `null`.
      */
-    'get': (menuId?: string) => HTMLIonMenuElement;
+    'get': (menuId?: string | undefined) => HTMLIonMenuElement | null;
     'getMenus': () => HTMLIonMenuElement[];
-    'getOpen': () => HTMLIonMenuElement;
+    'getOpen': () => HTMLIonMenuElement | null;
     'isAnimating': () => boolean;
-    'isEnabled': (menuId?: string) => boolean;
-    'isOpen': (menuId?: string) => boolean;
+    'isEnabled': (menuId?: string | undefined) => boolean;
+    'isOpen': (menuId?: string | undefined) => boolean;
     /**
      * Programatically open the Menu.
      */
-    'open': (menuId?: string) => Promise<boolean>;
+    'open': (menuId?: string | undefined) => Promise<boolean>;
     'registerAnimation': (name: string, animation: AnimationBuilder) => void;
     /**
      * Used to enable or disable the ability to swipe open the menu.
      */
-    'swipeEnable': (shouldEnable: boolean, menuId?: string) => HTMLIonMenuElement;
+    'swipeEnable': (shouldEnable: boolean, menuId?: string | undefined) => HTMLIonMenuElement | null;
     /**
      * Toggle the menu. If it's closed, it will open, and if opened, it will close.
      */
-    'toggle': (menuId?: string) => Promise<boolean>;
+    'toggle': (menuId?: string | undefined) => Promise<boolean>;
   }
   var HTMLIonMenuControllerElement: {
     prototype: HTMLIonMenuControllerElement;
@@ -3287,8 +3287,8 @@ declare global {
 
 declare global {
   interface HTMLIonModalControllerElement extends HTMLStencilElement {
-    'create': (opts?: ModalOptions) => Promise<HTMLIonModalElement>;
-    'dismiss': (data?: any, role?: string, modalId?: number) => Promise<void>;
+    'create': (opts?: ModalOptions | undefined) => Promise<HTMLIonModalElement>;
+    'dismiss': (data?: any, role?: string | undefined, modalId?: number) => Promise<void>;
     'getTop': () => HTMLIonModalElement;
   }
   var HTMLIonModalControllerElement: {
@@ -3336,7 +3336,7 @@ declare global {
     /**
      * Dismiss the modal overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * If true, the modal will be dismissed when the backdrop is clicked. Defaults to `true`.
      */
@@ -3357,11 +3357,11 @@ declare global {
     /**
      * Returns a promise that resolves when the modal did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await modal.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the modal will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await modal.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * Present the modal overlay after it has been created.
@@ -3557,24 +3557,24 @@ declare global {
 declare global {
   interface HTMLIonNavElement extends HTMLStencilElement {
     'animated': boolean;
-    'canGoBack': (view?: ViewController) => boolean;
+    'canGoBack': (view?: ViewController | undefined) => boolean;
     'delegate': FrameworkDelegate|undefined;
-    'getActive': () => ViewController;
-    'getByIndex': (index: number) => ViewController;
-    'getPrevious': (view?: ViewController) => ViewController;
-    'getRouteId': () => RouteID;
-    'insert': (insertIndex: number, component: NavComponent, componentProps?: ComponentProps, opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
-    'insertPages': (insertIndex: number, insertComponents: NavComponent[], opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
+    'getActive': () => ViewController | undefined;
+    'getByIndex': (index: number) => ViewController | undefined;
+    'getPrevious': (view?: ViewController | undefined) => ViewController | undefined;
+    'getRouteId': () => RouteID | undefined;
+    'insert': (insertIndex: number, component: NavComponent, componentProps?: ComponentProps | undefined, opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
+    'insertPages': (insertIndex: number, insertComponents: NavComponent[], opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
     'length': () => number;
-    'pop': (opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
-    'popTo': (indexOrViewCtrl: number | ViewController, opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
-    'popToRoot': (opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
-    'push': (component: NavComponent, componentProps?: ComponentProps, opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
-    'removeIndex': (startIndex: number, removeCount?: number, opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
+    'pop': (opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
+    'popTo': (indexOrViewCtrl: number | ViewController, opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
+    'popToRoot': (opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
+    'push': (component: NavComponent, componentProps?: ComponentProps | undefined, opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
+    'removeIndex': (startIndex: number, removeCount?: number, opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
     'root': NavComponent|undefined;
     'rootParams': ComponentProps|undefined;
-    'setPages': (views: any[], opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
-    'setRoot': (component: NavComponent, componentProps?: ComponentProps, opts?: NavOptions, done?: TransitionDoneFn) => Promise<boolean>;
+    'setPages': (views: any[], opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
+    'setRoot': (component: NavComponent, componentProps?: ComponentProps | undefined, opts?: NavOptions | undefined, done?: TransitionDoneFn | undefined) => Promise<boolean>;
     'setRouteId': (id: string, params: any, direction: number) => Promise<RouteWrite>;
     'swipeBackEnabled': boolean;
   }
@@ -3677,8 +3677,8 @@ declare global {
 
 declare global {
   interface HTMLIonPickerControllerElement extends HTMLStencilElement {
-    'create': (opts?: PickerOptions) => Promise<HTMLIonPickerElement>;
-    'dismiss': (data?: any, role?: string, pickerId?: number) => Promise<void>;
+    'create': (opts?: PickerOptions | undefined) => Promise<HTMLIonPickerElement>;
+    'dismiss': (data?: any, role?: string | undefined, pickerId?: number) => Promise<void>;
     'getTop': () => HTMLIonPickerElement;
   }
   var HTMLIonPickerControllerElement: {
@@ -3723,7 +3723,7 @@ declare global {
     /**
      * Dismiss the picker overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * Number of milliseconds to wait before dismissing the picker.
      */
@@ -3736,7 +3736,7 @@ declare global {
      * Animation to use when the picker is presented.
      */
     'enterAnimation': AnimationBuilder;
-    'getColumn': (name: string) => PickerColumn;
+    'getColumn': (name: string) => PickerColumn | undefined;
     'getColumns': () => PickerColumn[];
     'keyboardClose': boolean;
     /**
@@ -3746,11 +3746,11 @@ declare global {
     /**
      * Returns a promise that resolves when the picker did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await picker.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the picker will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await picker.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * Present the picker overlay after it has been created.
@@ -3893,8 +3893,8 @@ declare global {
 
 declare global {
   interface HTMLIonPopoverControllerElement extends HTMLStencilElement {
-    'create': (opts?: PopoverOptions) => Promise<HTMLIonPopoverElement>;
-    'dismiss': (data?: any, role?: string, popoverId?: number) => Promise<void>;
+    'create': (opts?: PopoverOptions | undefined) => Promise<HTMLIonPopoverElement>;
+    'dismiss': (data?: any, role?: string | undefined, popoverId?: number) => Promise<void>;
     'getTop': () => HTMLIonPopoverElement;
   }
   var HTMLIonPopoverControllerElement: {
@@ -3942,7 +3942,7 @@ declare global {
     /**
      * Dismiss the popover overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * If true, the popover will be dismissed when the backdrop is clicked. Defaults to `true`.
      */
@@ -3967,11 +3967,11 @@ declare global {
     /**
      * Returns a promise that resolves when the popover did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await popover.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the popover will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await popover.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * Present the popover overlay after it has been created.
@@ -4322,7 +4322,7 @@ declare global {
     /**
      * Returns the ratio of the upper value's is current location, which is a number between `0` and `1`. If there is only one knob, then this will return `null`.
      */
-    'ratioUpper': () => number;
+    'ratioUpper': () => number | null;
     /**
      * If true, the knob snaps to tick marks evenly spaced based on the step property value. Defaults to `false`.
      */
@@ -4751,10 +4751,10 @@ declare global {
   interface HTMLIonRouterOutletElement extends HTMLStencilElement {
     'animated': boolean;
     'animationBuilder': AnimationBuilder;
-    'commit': (enteringEl: HTMLElement, leavingEl: HTMLElement, opts?: RouterOutletOptions) => Promise<boolean>;
+    'commit': (enteringEl: HTMLElement, leavingEl: HTMLElement | undefined, opts?: RouterOutletOptions | undefined) => Promise<boolean>;
     'delegate': FrameworkDelegate;
-    'getRouteId': () => RouteID;
-    'setRoot': (component: ComponentRef, params?: ComponentProps, opts?: RouterOutletOptions) => Promise<boolean>;
+    'getRouteId': () => RouteID | undefined;
+    'setRoot': (component: ComponentRef, params?: ComponentProps | undefined, opts?: RouterOutletOptions | undefined) => Promise<boolean>;
     'setRouteId': (id: string, params: any, direction: number) => Promise<RouteWrite>;
   }
   var HTMLIonRouterOutletElement: {
@@ -4850,10 +4850,10 @@ declare global {
      */
     'forceOverscroll': boolean;
     'mode': string;
-    'scrollByPoint': (x: number, y: number, duration: number, done?: Function) => Promise<any>;
+    'scrollByPoint': (x: number, y: number, duration: number, done?: Function | undefined) => Promise<any>;
     'scrollEvents': boolean;
     'scrollToBottom': (duration: number) => Promise<void>;
-    'scrollToPoint': (x: number, y: number, duration: number, done?: Function) => Promise<any>;
+    'scrollToPoint': (x: number, y: number, duration: number, done?: Function | undefined) => Promise<any>;
     'scrollToTop': (duration: number) => Promise<void>;
   }
   var HTMLIonScrollElement: {
@@ -5178,7 +5178,7 @@ declare global {
     /**
      * The text value of the option.
      */
-    'value': string|null;
+    'value': string;
   }
   var HTMLIonSelectOptionElement: {
     prototype: HTMLIonSelectOptionElement;
@@ -5216,7 +5216,7 @@ declare global {
       /**
        * The text value of the option.
        */
-      'value'?: string|null;
+      'value'?: string;
     }
   }
 }
@@ -5296,7 +5296,7 @@ declare global {
     /**
      * the value of the select.
      */
-    'value': string | string[] | null;
+    'value': string | string[] | undefined;
   }
   var HTMLIonSelectElement: {
     prototype: HTMLIonSelectElement;
@@ -5374,7 +5374,7 @@ declare global {
       /**
        * the value of the select.
        */
-      'value'?: string | string[] | null;
+      'value'?: string | string[] | undefined;
     }
   }
 }
@@ -5516,15 +5516,15 @@ declare global {
     /**
      * Transition to the next slide.
      */
-    'slideNext': (speed?: number, runCallbacks?: boolean) => void;
+    'slideNext': (speed?: number | undefined, runCallbacks?: boolean | undefined) => void;
     /**
      * Transition to the previous slide.
      */
-    'slidePrev': (speed?: number, runCallbacks?: boolean) => void;
+    'slidePrev': (speed?: number | undefined, runCallbacks?: boolean | undefined) => void;
     /**
      * Transition to the specified slide.
      */
-    'slideTo': (index: number, speed?: number, runCallbacks?: boolean) => void;
+    'slideTo': (index: number, speed?: number | undefined, runCallbacks?: boolean | undefined) => void;
     /**
      * Start auto play.
      */
@@ -5816,7 +5816,7 @@ declare global {
      * If true, the user cannot interact with the tab. Defaults to `false`.
      */
     'disabled': boolean;
-    'getTabId': () => string;
+    'getTabId': () => string | null;
     /**
      * The URL which will be used as the `href` within this tab's `<ion-tab-button>` anchor.
      */
@@ -5971,9 +5971,9 @@ declare global {
      * The color to use from your Sass `$colors` map. Default options are: `"primary"`, `"secondary"`, `"tertiary"`, `"success"`, `"warning"`, `"danger"`, `"light"`, `"medium"`, and `"dark"`. For more information, see [Theming your App](/docs/theming/theming-your-app).
      */
     'color': string;
-    'getRouteId': () => RouteID;
-    'getSelected': () => HTMLIonTabElement;
-    'getTab': (tabOrIndex: string | number | HTMLIonTabElement) => HTMLIonTabElement;
+    'getRouteId': () => RouteID | undefined;
+    'getSelected': () => HTMLIonTabElement | undefined;
+    'getTab': (tabOrIndex: string | number | HTMLIonTabElement) => HTMLIonTabElement | undefined;
     /**
      * A unique name for the tabs
      */
@@ -6362,8 +6362,8 @@ declare global {
 
 declare global {
   interface HTMLIonToastControllerElement extends HTMLStencilElement {
-    'create': (opts?: ToastOptions) => Promise<HTMLIonToastElement>;
-    'dismiss': (data?: any, role?: string, toastId?: number) => Promise<void>;
+    'create': (opts?: ToastOptions | undefined) => Promise<HTMLIonToastElement>;
+    'dismiss': (data?: any, role?: string | undefined, toastId?: number) => Promise<void>;
     'getTop': () => HTMLIonToastElement;
   }
   var HTMLIonToastControllerElement: {
@@ -6402,7 +6402,7 @@ declare global {
     /**
      * Dismiss the toast overlay after it has been presented.
      */
-    'dismiss': (data?: any, role?: string) => Promise<void>;
+    'dismiss': (data?: any, role?: string | undefined) => Promise<void>;
     /**
      * If true, the toast will dismiss when the page changes. Defaults to `false`.
      */
@@ -6427,11 +6427,11 @@ declare global {
     /**
      * Returns a promise that resolves when the toast did dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await toast.onDidDismiss(); ```
      */
-    'onDidDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onDidDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     /**
      * Returns a promise that resolves when the toast will dismiss. It also accepts a callback that is called in the same circustances.  ``` const {data, role} = await toast.onWillDismiss(); ```
      */
-    'onWillDismiss': (callback?: (detail: OverlayEventDetail) => void) => Promise<OverlayEventDetail>;
+    'onWillDismiss': (callback?: ((detail: OverlayEventDetail) => void) | undefined) => Promise<OverlayEventDetail>;
     'overlayId': number;
     /**
      * The position of the toast on the screen. Possible values: "top", "middle", "bottom".
diff --git a/core/src/components/datetime/datetime-util.ts b/core/src/components/datetime/datetime-util.ts
index fab4b713f0..90975c1b61 100644
--- a/core/src/components/datetime/datetime-util.ts
+++ b/core/src/components/datetime/datetime-util.ts
@@ -1,9 +1,7 @@
 
-export function isBlank(val: any): val is null { return val === undefined || val === null; }
-
 export function renderDatetime(template: string, value: DatetimeData, locale: LocaleData) {
   if (value === undefined) {
-    return '';
+    return undefined;
   }
 
   const tokens: string[] = [];
@@ -24,7 +22,7 @@ export function renderDatetime(template: string, value: DatetimeData, locale: Lo
   });
 
   if (!hasText) {
-    return '';
+    return undefined;
   }
 
   for (let i = 0; i < tokens.length; i += 2) {
@@ -37,9 +35,9 @@ export function renderDatetime(template: string, value: DatetimeData, locale: Lo
 
 export function renderTextFormat(format: string, value: any, date: DatetimeData|null, locale: LocaleData): string {
 
-  if (format === FORMAT_DDDD || format === FORMAT_DDD) {
+  if ((format === FORMAT_DDDD || format === FORMAT_DDD)) {
     try {
-      value = (new Date(date.year, date.month - 1, date.day)).getDay();
+      value = (new Date(date!.year!, date!.month! - 1, date!.day)).getDay();
 
       if (format === FORMAT_DDDD) {
         return (locale.dayNames ? locale.dayNames : DAY_NAMES)[value];
@@ -62,7 +60,7 @@ export function renderTextFormat(format: string, value: any, date: DatetimeData|
     return date && date.hour ? date.hour < 12 ? 'am' : 'pm' : value ? value : '';
   }
 
-  if (isBlank(value)) {
+  if (value == null) {
     return '';
   }
 
@@ -155,7 +153,7 @@ export function dateValueRange(format: string, min: DatetimeData, max: DatetimeD
   return opts;
 }
 
-export function dateSortValue(year: number, month: number, day: number, hour = 0, minute = 0): number {
+export function dateSortValue(year: number|undefined, month: number|undefined, day: number|undefined, hour = 0, minute = 0): number {
   return parseInt(`1${fourDigit(year)}${twoDigit(month)}${twoDigit(day)}${twoDigit(hour)}${twoDigit(minute)}`, 10);
 }
 
@@ -181,7 +179,7 @@ const TIME_REGEXP = /^((\d{2}):(\d{2})(?::(\d{2})(?:\.(\d{3}))?)?(?:(Z)|([+\-])(
 export function parseDate(val: any): DatetimeData|null {
   // manually parse IS0 cuz Date.parse cannot be trusted
   // ISO 8601 format: 1994-12-15T13:47:20Z
-  let parse: any[] = null;
+  let parse: any[]|null = null;
 
   if (val && val !== '') {
     // try parsing for just time first, HH:MM
@@ -197,7 +195,7 @@ export function parseDate(val: any): DatetimeData|null {
     }
   }
 
-  if (isBlank(parse)) {
+  if (parse == null) {
     // wasn't able to parse the ISO datetime
     return null;
   }
@@ -316,12 +314,12 @@ export function parseTemplate(template: string): string[] {
 
 export function getValueFromFormat(date: DatetimeData, format: string) {
   if (format === FORMAT_A || format === FORMAT_a) {
-    return (date.hour < 12 ? 'am' : 'pm');
+    return (date.hour! < 12 ? 'am' : 'pm');
   }
   if (format === FORMAT_hh || format === FORMAT_h) {
-    return (date.hour > 12 ? date.hour - 12 : date.hour);
+    return (date.hour! > 12 ? date.hour! - 12 : date.hour);
   }
-  return (date as any)[convertFormatToKey(format)];
+  return (date as any)[convertFormatToKey(format)!];
 }
 
 
@@ -356,12 +354,12 @@ export function convertDataToISO(data: DatetimeData): string {
             // YYYY-MM-DDTHH:mm:SS
             rtn += `T${twoDigit(data.hour)}:${twoDigit(data.minute)}:${twoDigit(data.second)}`;
 
-            if (data.millisecond > 0) {
+            if (data.millisecond! > 0) {
               // YYYY-MM-DDTHH:mm:SS.SSS
               rtn += '.' + threeDigit(data.millisecond);
             }
 
-            if (isBlank(data.tzOffset) || data.tzOffset === 0) {
+            if (data.tzOffset == null || data.tzOffset === 0) {
               // YYYY-MM-DDTHH:mm:SSZ
               rtn += 'Z';
 
@@ -397,9 +395,9 @@ export function convertDataToISO(data: DatetimeData): string {
  * Use to convert a string of comma separated strings or
  * an array of strings, and clean up any user input
  */
-export function convertToArrayOfStrings(input: string | string[] | undefined | null, type: string): string[] {
+export function convertToArrayOfStrings(input: string | string[] | undefined | null, type: string): string[]|undefined {
   if (!input) {
-    return null;
+    return undefined;
   }
 
   if (typeof input === 'string') {
@@ -408,7 +406,7 @@ export function convertToArrayOfStrings(input: string | string[] | undefined | n
     input = input.replace(/\[|\]/g, '').split(',');
   }
 
-  let values: string[];
+  let values: string[] | undefined = undefined;
   if (Array.isArray(input)) {
     // trim up each string value
     values = input.map(val => val.toString().trim());
diff --git a/core/src/components/datetime/datetime.tsx b/core/src/components/datetime/datetime.tsx
index ac3d9e6237..1f0b646624 100644
--- a/core/src/components/datetime/datetime.tsx
+++ b/core/src/components/datetime/datetime.tsx
@@ -12,7 +12,6 @@ import {
   dateValueRange,
   daysInMonth,
   getValueFromFormat,
-  isBlank,
   parseDate,
   parseTemplate,
   renderDatetime,
@@ -67,7 +66,7 @@ export class Datetime {
    * datetime. For example, the minimum could just be the year, such as `1994`.
    * Defaults to the beginning of the year, 100 years ago from today.
    */
-  @Prop({ mutable: true }) min: string;
+  @Prop({ mutable: true }) min: string | undefined;
 
   /**
    * The maximum datetime allowed. Value must be a date string
@@ -77,7 +76,7 @@ export class Datetime {
    * datetime. For example, the maximum could just be the year, such as `1994`.
    * Defaults to the end of this year.
    */
-  @Prop({ mutable: true }) max: string;
+  @Prop({ mutable: true }) max: string | undefined;
 
   /**
    * The display format of the date and time as text that shows
@@ -96,7 +95,7 @@ export class Datetime {
    * choose an exact date from the datetime picker. Each column follows the string
    * parse format. Defaults to use `displayFormat`.
    */
-  @Prop() pickerFormat: string;
+  @Prop() pickerFormat: string | undefined;
 
   /**
    * The text to display on the picker's cancel button. Default: `Cancel`.
@@ -115,7 +114,7 @@ export class Datetime {
    * of numbers, or string of comma separated numbers. For example, to show upcoming and
    * recent leap years, then this input's value would be `yearValues="2024,2020,2016,2012,2008"`.
    */
-  @Prop() yearValues: number[] | number | string;
+  @Prop() yearValues: number[] | number | string | undefined;
 
   /**
    * Values used to create the list of selectable months. By default
@@ -125,7 +124,7 @@ export class Datetime {
    * input value would be `monthValues="6,7,8"`. Note that month numbers do *not* have a
    * zero-based index, meaning January's value is `1`, and December's is `12`.
    */
-  @Prop() monthValues: number[] | number | string;
+  @Prop() monthValues: number[] | number | string | undefined;
 
   /**
    * Values used to create the list of selectable days. By default
@@ -135,7 +134,7 @@ export class Datetime {
    * number for the selected month, like `31` in February, it will correctly not show
    * days which are not valid for the selected month.
    */
-  @Prop() dayValues: number[] | number | string;
+  @Prop() dayValues: number[] | number | string | undefined;
 
   /**
    * Values used to create the list of selectable hours. By default
@@ -143,7 +142,7 @@ export class Datetime {
    * to control exactly which hours to display, the `hourValues` input can take a number, an
    * array of numbers, or a string of comma separated numbers.
    */
-  @Prop() hourValues: number[] | number | string;
+  @Prop() hourValues: number[] | number | string | undefined;
 
   /**
    * Values used to create the list of selectable minutes. By default
@@ -152,31 +151,31 @@ export class Datetime {
    * separated numbers. For example, if the minute selections should only be every 15 minutes,
    * then this input value would be `minuteValues="0,15,30,45"`.
    */
-  @Prop() minuteValues: number[] | number | string;
+  @Prop() minuteValues: number[] | number | string | undefined;
 
   /**
    * Full names for each month name. This can be used to provide
    * locale month names. Defaults to English.
    */
-  @Prop() monthNames: string[] | string;
+  @Prop() monthNames: string[] | string | undefined;
 
   /**
    * Short abbreviated names for each month name. This can be used to provide
    * locale month names. Defaults to English.
    */
-  @Prop() monthShortNames: string[] | string;
+  @Prop() monthShortNames: string[] | string | undefined;
 
   /**
    * Full day of the week names. This can be used to provide
    * locale names for each day in the week. Defaults to English.
    */
-  @Prop() dayNames: string[] | string;
+  @Prop() dayNames: string[] | string | undefined;
 
   /**
    * Short abbreviated day of the week names. This can be used to provide
    * locale names for each day in the week. Defaults to English.
    */
-  @Prop() dayShortNames: string[] | string;
+  @Prop() dayShortNames: string[] | string | undefined;
 
   /**
    * Any additional options that the picker interface can accept.
@@ -191,7 +190,7 @@ export class Datetime {
    * The text to display when there's no date selected yet.
    * Using lowercase to match the input attribute
    */
-  @Prop() placeholder: string;
+  @Prop() placeholder: string | undefined;
 
   /**
    * the value of the datetime.
@@ -237,7 +236,7 @@ export class Datetime {
     this.emitStyle();
   }
 
-  emitStyle() {
+  private emitStyle() {
     clearTimeout(this.styleTmr);
 
     this.styleTmr = setTimeout(() => {
@@ -249,15 +248,12 @@ export class Datetime {
     });
   }
 
-  /**
-   * Update the datetime text and datetime value
-   */
-  updateValue() {
+  private updateValue() {
     updateDate(this.datetimeValue, this.value);
     this.updateText();
   }
 
-  buildPicker(pickerOptions: PickerOptions) {
+  private buildPicker(pickerOptions: PickerOptions) {
     console.debug('Build Datetime: Picker with', pickerOptions);
 
     // If the user has not passed in picker buttons,
@@ -293,7 +289,7 @@ export class Datetime {
     return picker;
   }
 
-  open() {
+  private open() {
     const pickerOptions = {...this.pickerOptions};
 
     // TODO check this.isFocus() || this.disabled
@@ -315,10 +311,7 @@ export class Datetime {
     });
   }
 
-
-  /**
-   */
-  generateColumns(): PickerColumn[] {
+  private generateColumns(): PickerColumn[] {
     let columns: PickerColumn[] = [];
 
     // if a picker format wasn't provided, then fallback
@@ -344,7 +337,7 @@ export class Datetime {
       parseTemplate(template).forEach((format: any) => {
         // loop through each format in the template
         // create a new picker column to build up with data
-        const key = convertFormatToKey(format);
+        const key = convertFormatToKey(format)!;
         let values: any[];
 
         // check if they have exact values to use for this date part
@@ -393,10 +386,7 @@ export class Datetime {
     return columns;
   }
 
-  /**
-   * @private
-   */
-  validate() {
+  private validate() {
     const today = new Date();
     const minCompareVal = dateDataSortValue(this.datetimeMin);
     const maxCompareVal = dateDataSortValue(this.datetimeMax);
@@ -409,10 +399,13 @@ export class Datetime {
         selectedYear = yearCol.options[0].value;
       }
 
-      const yearOpt = yearCol.options[yearCol.selectedIndex];
-      if (yearOpt) {
-        // they have a selected year value
-        selectedYear = yearOpt.value;
+      const selectedIndex = yearCol.selectedIndex;
+      if (selectedIndex != null) {
+        const yearOpt = yearCol.options[selectedIndex];
+        if (yearOpt) {
+          // they have a selected year value
+          selectedYear = yearOpt.value;
+        }
       }
     }
 
@@ -446,30 +439,27 @@ export class Datetime {
     );
   }
 
-
-  /**
-   */
-  calcMinMax(now?: Date) {
+  private calcMinMax(now?: Date) {
     const todaysYear = (now || new Date()).getFullYear();
 
     if (this.yearValues) {
       const years = convertToArrayOfNumbers(this.yearValues, 'year');
-      if (isBlank(this.min)) {
+      if (this.min == null) {
         this.min = Math.min.apply(Math, years);
       }
-      if (isBlank(this.max)) {
+      if (this.max == null) {
         this.max = Math.max.apply(Math, years);
       }
     } else {
-      if (isBlank(this.min)) {
+      if (this.min == null) {
         this.min = (todaysYear - 100).toString();
       }
-      if (isBlank(this.max)) {
+      if (this.max == null) {
         this.max = todaysYear.toString();
       }
     }
-    const min = this.datetimeMin = parseDate(this.min);
-    const max = this.datetimeMax = parseDate(this.max);
+    const min = this.datetimeMin = parseDate(this.min)!;
+    const max = this.datetimeMax = parseDate(this.max)!;
 
     min.year = min.year || todaysYear;
     max.year = max.year || todaysYear;
@@ -501,10 +491,7 @@ export class Datetime {
     }
   }
 
-
-  /**
-   */
-  validateColumn(name: string, index: number, min: number, max: number, lowerBounds: number[], upperBounds: number[]): number {
+  private validateColumn(name: string, index: number, min: number, max: number, lowerBounds: number[], upperBounds: number[]): number {
     const column = this.picker.getColumn(name);
     if (!column) {
       return 0;
@@ -533,7 +520,7 @@ export class Datetime {
         indexMax = Math.max(indexMax, i);
       }
     }
-    const selectedIndex = column.selectedIndex = clamp(indexMin, column.selectedIndex, indexMax);
+    const selectedIndex = column.selectedIndex = clamp(indexMin, column.selectedIndex!, indexMax);
     const opt = column.options[selectedIndex];
     if (opt) {
       return opt.value;
@@ -542,9 +529,7 @@ export class Datetime {
   }
 
 
-  /**
-   */
-  divyColumns(columns: PickerColumn[]): PickerColumn[] {
+  private divyColumns(columns: PickerColumn[]): PickerColumn[] {
     const pickerColumns = columns;
     const columnsWidth: number[] = [];
     let col: PickerColumn;
@@ -554,7 +539,7 @@ export class Datetime {
       columnsWidth.push(0);
 
       for (let j = 0; j < col.options.length; j++) {
-        width = col.options[j].text.length;
+        width = col.options[j].text!.length;
         if (width > columnsWidth[i]) {
           columnsWidth[i] = width;
         }
@@ -580,9 +565,10 @@ export class Datetime {
 
   /**
    */
-  updateText() {
+  private updateText() {
     // create the text of the formatted data
     const template = this.displayFormat || this.pickerFormat || DEFAULT_FORMAT;
+    // debugger;
     this.text = renderDatetime(template, this.datetimeValue, this.locale);
   }
 
@@ -608,9 +594,13 @@ export class Datetime {
 
     // If selected text has been passed in, use that first
     let datetimeText = this.text;
-    if (!datetimeText && this.placeholder) {
-      datetimeText = this.placeholder;
-      addPlaceholderClass = true;
+    if (datetimeText == null) {
+      if (this.placeholder) {
+        datetimeText = this.placeholder;
+        addPlaceholderClass = true;
+      } else {
+        datetimeText = '';
+      }
     }
 
     const datetimeTextClasses: CssClassMap = {
diff --git a/core/src/components/hide-when/hide-when.tsx b/core/src/components/hide-when/hide-when.tsx
index 8425174f49..38db4e87de 100644
--- a/core/src/components/hide-when/hide-when.tsx
+++ b/core/src/components/hide-when/hide-when.tsx
@@ -16,11 +16,11 @@ export class HideWhen implements DisplayWhen {
   @Prop({ context: 'config' }) config: Config;
   @Prop({ context: 'platforms' }) calculatedPlatforms: PlatformConfig[];
 
-  @Prop() orientation: string = null;
-  @Prop() mediaQuery: string = null;
-  @Prop() size: string = null;
-  @Prop() mode: string = null;
-  @Prop() platform: string = null;
+  @Prop() orientation: string|undefined;
+  @Prop() mediaQuery: string|undefined;
+  @Prop() size: string|undefined;
+  @Prop() mode: string|undefined;
+  @Prop() platform: string|undefined;
   @Prop() or = false;
 
   @State() passesTest = false;
diff --git a/core/src/components/input-shims/hacks/scroll-assist.ts b/core/src/components/input-shims/hacks/scroll-assist.ts
index f47d4afca3..8564072671 100644
--- a/core/src/components/input-shims/hacks/scroll-assist.ts
+++ b/core/src/components/input-shims/hacks/scroll-assist.ts
@@ -10,12 +10,12 @@ export default function enableScrollAssist(
   keyboardHeight: number
 ) {
   let coord: any;
-  const touchStart = (ev: UIEvent) => {
+  const touchStart = (ev: Event) => {
     coord = pointerCoord(ev);
     console.debug(`input-base, pointerStart, type: ${ev.type}`);
   };
 
-  const touchEnd = (ev: UIEvent) => {
+  const touchEnd = (ev: Event) => {
     // input cover touchend/mouseup
     console.debug(`input-base, pointerEnd, type: ${ev.type}`);
     if (!coord) {
@@ -85,6 +85,6 @@ function hasPointerMoved(threshold: number, startCoord: PointerCoordinates, endC
 }
 
 export interface PointerCoordinates {
-  x?: number;
-  y?: number;
+  x: number;
+  y: number;
 }
diff --git a/core/src/components/input-shims/hacks/scroll-padding.ts b/core/src/components/input-shims/hacks/scroll-padding.ts
index 51fb97c40f..d9615165c1 100644
--- a/core/src/components/input-shims/hacks/scroll-padding.ts
+++ b/core/src/components/input-shims/hacks/scroll-padding.ts
@@ -23,7 +23,7 @@ function setScrollPadding(input: HTMLElement, keyboardHeight: number) {
   if (input.tagName !== 'INPUT') {
     return;
   }
-  if (input.parentElement.tagName === 'ION-INPUT') {
+  if (input.parentElement && input.parentElement.tagName === 'ION-INPUT') {
     return;
   }
   const el = input.closest('.scroll-inner') as HTMLElement;
diff --git a/core/src/components/input-shims/input-shims.tsx b/core/src/components/input-shims/input-shims.tsx
index b9d2bdf0dd..75b65b09a0 100644
--- a/core/src/components/input-shims/input-shims.tsx
+++ b/core/src/components/input-shims/input-shims.tsx
@@ -69,12 +69,16 @@ export class InputShims {
     const scrollEl = componentEl.closest('ion-scroll');
     const contentEl = componentEl.closest('ion-content');
 
-    if (HIDE_CARET && this.hideCaret && !this.hideCaretMap.has(componentEl)) {
+    if (!inputEl) {
+      return;
+    }
+
+    if (HIDE_CARET && scrollEl && this.hideCaret && !this.hideCaretMap.has(componentEl)) {
       const rmFn = enableHideCaretOnScroll(componentEl, inputEl, scrollEl);
       this.hideCaretMap.set(componentEl, rmFn);
     }
 
-    if (SCROLL_ASSIST && this.scrollAssist && !this.scrollAssistMap.has(componentEl)) {
+    if (SCROLL_ASSIST && contentEl && this.scrollAssist && !this.scrollAssistMap.has(componentEl)) {
       const rmFn = enableScrollAssist(componentEl, inputEl, contentEl, this.keyboardHeight);
       this.scrollAssistMap.set(componentEl, rmFn);
     }
diff --git a/core/src/components/input/input.tsx b/core/src/components/input/input.tsx
index 3ab9a05b08..5511555b74 100644
--- a/core/src/components/input/input.tsx
+++ b/core/src/components/input/input.tsx
@@ -17,7 +17,7 @@ import { InputComponent } from './input-base';
 })
 export class Input implements InputComponent {
 
-  private nativeInput: HTMLInputElement;
+  private nativeInput: HTMLInputElement|undefined;
   mode: string;
   color: string;
 
@@ -230,7 +230,7 @@ export class Input implements InputComponent {
   }
 
   componentDidUnload() {
-    this.nativeInput = null;
+    this.nativeInput = undefined;
     this.ionInputDidUnload.emit(this.el);
   }
 
@@ -258,7 +258,7 @@ export class Input implements InputComponent {
   }
 
   inputChanged(ev: Event) {
-    this.value = ev.target && (ev.target as HTMLInputElement).value;
+    this.value = ev.target && (ev.target as HTMLInputElement).value || '';
     this.ionInput.emit(ev);
     this.emitStyle();
   }
diff --git a/core/src/components/item-sliding/item-sliding.tsx b/core/src/components/item-sliding/item-sliding.tsx
index e7f8465edd..cdb8f8f679 100644
--- a/core/src/components/item-sliding/item-sliding.tsx
+++ b/core/src/components/item-sliding/item-sliding.tsx
@@ -31,16 +31,16 @@ export const enum SlidingState {
   }
 })
 export class ItemSliding {
-  private item: HTMLIonItemElement|null;
-  private list: HTMLIonListElement|null;
+  private item: HTMLIonItemElement|null = null;
+  private list: HTMLIonListElement|null = null;
   private openAmount = 0;
   private initialOpenAmount = 0;
   private optsWidthRightSide = 0;
   private optsWidthLeftSide = 0;
   private sides: ItemSide;
-  private tmr: number;
-  private leftOptions: HTMLIonItemOptionsElement|null;
-  private rightOptions: HTMLIonItemOptionsElement|null;
+  private tmr: number|undefined;
+  private leftOptions: HTMLIonItemOptionsElement|undefined;
+  private rightOptions: HTMLIonItemOptionsElement|undefined;
   private optsDirty = true;
 
   @Element() private el: HTMLElement;
@@ -60,7 +60,8 @@ export class ItemSliding {
   }
 
   componentDidUnload() {
-    this.item = this.list = this.leftOptions = this.rightOptions = null;
+    this.item = this.list = null;
+    this.leftOptions = this.rightOptions = undefined;
   }
 
   /**
@@ -112,7 +113,7 @@ export class ItemSliding {
     let sides = 0;
 
     // Reset left and right options in case they were removed
-    this.leftOptions = this.rightOptions = null;
+    this.leftOptions = this.rightOptions = undefined;
 
     for (let i = 0; i < options.length; i++) {
       const option = options.item(i);
@@ -143,14 +144,16 @@ export class ItemSliding {
 
     if (this.tmr) {
       clearTimeout(this.tmr);
-      this.tmr = null;
+      this.tmr = undefined;
     }
     if (this.openAmount === 0) {
       this.optsDirty = true;
       this.state = SlidingState.Enabled;
     }
     this.initialOpenAmount = this.openAmount;
-    this.item.style.transition = 'none';
+    if (this.item) {
+      this.item.style.transition = 'none';
+    }
   }
 
   private onDragMove(gesture: GestureDetail) {
@@ -198,9 +201,9 @@ export class ItemSliding {
 
     this.setOpenAmount(restingPoint, true);
 
-    if (this.state & SlidingState.SwipeRight) {
+    if (this.state & SlidingState.SwipeRight && this.rightOptions) {
       this.rightOptions.fireSwipeEvent(this);
-    } else if (this.state & SlidingState.SwipeLeft) {
+    } else if (this.state & SlidingState.SwipeLeft && this.leftOptions) {
       this.leftOptions.fireSwipeEvent(this);
     }
   }
@@ -221,7 +224,10 @@ export class ItemSliding {
   private setOpenAmount(openAmount: number, isFinal: boolean) {
     if (this.tmr) {
       clearTimeout(this.tmr);
-      this.tmr = null;
+      this.tmr = undefined;
+    }
+    if (!this.item) {
+      return;
     }
     const style = this.item.style;
     this.openAmount = openAmount;
@@ -241,7 +247,7 @@ export class ItemSliding {
     } else {
       this.tmr = window.setTimeout(() => {
         this.state = SlidingState.Disabled;
-        this.tmr = null;
+        this.tmr = undefined;
       }, 600);
       this.list && this.list.setOpenItem(null);
       style.transform = '';
diff --git a/core/src/components/item/item.tsx b/core/src/components/item/item.tsx
index 100f110aab..f3de8188b0 100644
--- a/core/src/components/item/item.tsx
+++ b/core/src/components/item/item.tsx
@@ -1,4 +1,4 @@
-import { Component, Element, Listen, Prop, State } from '@stencil/core';
+import { Component, Element, Listen, Prop } from '@stencil/core';
 import { createThemedClasses, getElementClassMap, openURL } from '../../utils/theme';
 import { CssClassMap } from '../../index';
 
@@ -11,11 +11,10 @@ import { CssClassMap } from '../../index';
   }
 })
 export class Item {
+
   private itemStyles: { [key: string]: CssClassMap } = {};
 
-  @Element() private el: HTMLElement;
-
-  @State() hasStyleChange: boolean;
+  @Element() private el: HTMLStencilElement;
 
   /**
    * The color to use from your Sass `$colors` map.
@@ -61,23 +60,24 @@ export class Item {
   itemStyle(ev: UIEvent) {
     ev.stopPropagation();
 
-    let hasChildStyleChange = false;
-
     const tagName: string = (ev.target as HTMLElement).tagName;
-    const updatedStyles: any = ev.detail;
-
-    for (const key in updatedStyles) {
-      if (('item-' + key) !== key) {
-        Object.defineProperty(updatedStyles, 'item-' + key, Object.getOwnPropertyDescriptor(updatedStyles, key));
-        delete updatedStyles[key];
-        hasChildStyleChange = true;
+    const updatedStyles = ev.detail as any;
+    const updatedKeys = Object.keys(ev.detail);
+    const newStyles = {} as any;
+    const childStyles = this.itemStyles[tagName] || {};
+    let hasStyleChange = false;
+    for (const key of updatedKeys) {
+      const itemKey = `item-${key}`;
+      const newValue = updatedStyles[key];
+      if (newValue !== childStyles[itemKey]) {
+        hasStyleChange = true;
       }
+      newStyles[itemKey] = newValue;
     }
 
-    this.itemStyles[tagName] = updatedStyles;
-
-    if (hasChildStyleChange) {
-      this.hasStyleChange = true;
+    if (hasStyleChange) {
+      this.itemStyles[tagName] = newStyles;
+      this.el.forceUpdate();
     }
   }
 
@@ -93,10 +93,9 @@ export class Item {
   }
 
   render() {
-    let childStyles = {};
-
+    const childStyles = {};
     for (const key in this.itemStyles) {
-      childStyles = Object.assign(childStyles, this.itemStyles[key]);
+      Object.assign(childStyles, this.itemStyles[key]);
     }
 
     const clickable = !!(this.href || this.el.onclick || this.button);
@@ -119,8 +118,6 @@ export class Item {
       'item-detail-push': showDetail,
     };
 
-    this.hasStyleChange = false;
-
     return (
       <TagType
         {...attrs}
diff --git a/core/src/components/menu-controller/menu-controller.ts b/core/src/components/menu-controller/menu-controller.ts
index 0a30acc7fc..8891ec6eaa 100644
--- a/core/src/components/menu-controller/menu-controller.ts
+++ b/core/src/components/menu-controller/menu-controller.ts
@@ -78,7 +78,7 @@ export class MenuController {
    * @return {HTMLIonMenuElement}  Returns the instance of the menu, which is useful for chaining.
    */
   @Method()
-  enable(shouldEnable: boolean, menuId?: string): HTMLIonMenuElement {
+  enable(shouldEnable: boolean, menuId?: string): HTMLIonMenuElement|null {
     const menu = this.get(menuId);
     if (menu) {
       menu.disabled = !shouldEnable;
@@ -93,7 +93,7 @@ export class MenuController {
    * @return {HTMLIonMenuElement}  Returns the instance of the menu, which is useful for chaining.
    */
   @Method()
-  swipeEnable(shouldEnable: boolean, menuId?: string): HTMLIonMenuElement {
+  swipeEnable(shouldEnable: boolean, menuId?: string): HTMLIonMenuElement|null {
     const menu = this.get(menuId);
     if (menu) {
       menu.swipeEnabled = shouldEnable;
@@ -138,7 +138,7 @@ export class MenuController {
    * @return {HTMLIonMenuElement} Returns the instance of the menu if found, otherwise `null`.
    */
   @Method()
-  get(menuId?: string): HTMLIonMenuElement {
+  get(menuId?: string): HTMLIonMenuElement | null {
     if (menuId === 'left') {
       console.error('menu.side=left is deprecated, use "start" instead');
       return null;
@@ -179,7 +179,7 @@ export class MenuController {
    * @return {Menu} Returns the instance of the menu already opened, otherwise `null`.
    */
   @Method()
-  getOpen(): HTMLIonMenuElement {
+  getOpen(): HTMLIonMenuElement|null {
     return this.find(m => m.isOpen());
   }
 
@@ -269,7 +269,7 @@ export class MenuController {
     this.menuAnimations.set(name, animation);
   }
 
-  private find(predicate: (menu: Menu) => boolean): HTMLIonMenuElement {
+  private find(predicate: (menu: Menu) => boolean): HTMLIonMenuElement|null {
     const instance = this.menus.find(predicate);
     if (instance) {
       return instance.el;
diff --git a/core/src/components/menu/menu.tsx b/core/src/components/menu/menu.tsx
index 6ba2fa5a4d..8b119a247c 100644
--- a/core/src/components/menu/menu.tsx
+++ b/core/src/components/menu/menu.tsx
@@ -122,10 +122,10 @@ export class Menu {
   @Event() protected ionMenuChange: EventEmitter<MenuChangeEventDetail>;
 
   async componentWillLoad() {
-    this.menuCtrl = await this.lazyMenuCtrl.componentOnReady();
     if (this.type == null) {
       this.type = this.mode === 'ios' ? 'reveal' : 'overlay';
     }
+    this.menuCtrl = await this.lazyMenuCtrl.componentOnReady();
   }
 
   componentDidLoad() {
@@ -135,11 +135,12 @@ export class Menu {
     const el = this.el;
     const content = (this.contentId)
       ? document.getElementById(this.contentId)
-      : el.parentElement.querySelector('[main]');
+      : el.parentElement && el.parentElement.querySelector('[main]');
 
     if (!content || !content.tagName) {
       // requires content element
-      return console.error('Menu: must have a "content" element to listen for drag events on.');
+      console.error('Menu: must have a "content" element to listen for drag events on.');
+      return;
     }
     this.contentEl = content as HTMLElement;
 
@@ -151,13 +152,13 @@ export class Menu {
 
     let isEnabled = !this.disabled;
     if (isEnabled === true || typeof isEnabled === 'undefined') {
-      const menus = this.menuCtrl.getMenus();
+      const menus = this.menuCtrl!.getMenus();
       isEnabled = !menus.some(m => {
         return m.side === this.side && !m.disabled;
       });
     }
     // register this menu with the app's menu controller
-    this.menuCtrl._register(this);
+    this.menuCtrl!._register(this);
     this.ionMenuChange.emit({ disabled: !isEnabled, open: this._isOpen});
 
     // mask it as enabled / disabled
@@ -165,10 +166,10 @@ export class Menu {
   }
 
   componentDidUnload() {
-    this.menuCtrl._unregister(this);
+    this.menuCtrl!._unregister(this);
     this.animation && this.animation.destroy();
 
-    this.menuCtrl = this.animation = undefined;
+    this.animation = undefined;
     this.contentEl = this.backdropEl = this.menuInnerEl = undefined;
   }
 
@@ -210,7 +211,7 @@ export class Menu {
 
   @Method()
   setOpen(shouldOpen: boolean, animated = true): Promise<boolean> {
-    return this.menuCtrl._setOpen(this, shouldOpen, animated);
+    return this.menuCtrl!._setOpen(this, shouldOpen, animated);
   }
 
   async _setOpen(shouldOpen: boolean, animated = true): Promise<boolean> {
@@ -235,7 +236,7 @@ export class Menu {
   private async loadAnimation(): Promise<void> {
     // Menu swipe animation takes the menu's inner width as parameter,
     // If `offsetWidth` changes, we need to create a new animation.
-    const width = this.menuInnerEl.offsetWidth;
+    const width = this.menuInnerEl!.offsetWidth;
     if (width === this.width && this.animation !== undefined) {
       return;
     }
@@ -247,11 +248,11 @@ export class Menu {
       this.animation = undefined;
     }
     // Create new animation
-    this.animation = await this.menuCtrl.createAnimation(this.type, this);
+    this.animation = await this.menuCtrl!.createAnimation(this.type, this);
   }
 
   private async startAnimation(shouldOpen: boolean, animated: boolean): Promise<void> {
-    const ani = this.animation.reverse(!shouldOpen);
+    const ani = this.animation!.reverse(!shouldOpen);
     if (animated) {
       await ani.playAsync();
     } else {
@@ -271,7 +272,7 @@ export class Menu {
     }
     if (this._isOpen) {
       return true;
-    } else if (this.menuCtrl.getOpen()) {
+    } else if (this.menuCtrl!.getOpen()) {
       return false;
     }
     return checkEdgeSide(detail.currentX, this.isRightSide, this.maxEdgeStart);
@@ -283,8 +284,7 @@ export class Menu {
   }
 
   private onDragStart() {
-    assert(!!this.animation, '_type is undefined');
-    if (!this.isAnimating) {
+    if (!this.isAnimating || !this.animation) {
       assert(false, 'isAnimating has to be true');
       return;
     }
@@ -296,8 +296,7 @@ export class Menu {
   }
 
   private onDragMove(detail: GestureDetail) {
-    assert(!!this.animation, '_type is undefined');
-    if (!this.isAnimating) {
+    if (!this.isAnimating || !this.animation) {
       assert(false, 'isAnimating has to be true');
       return;
     }
@@ -308,8 +307,7 @@ export class Menu {
   }
 
   private onDragEnd(detail: GestureDetail) {
-    assert(!!this.animation, '_type is undefined');
-    if (!this.isAnimating) {
+    if (!this.isAnimating || !this.animation) {
       assert(false, 'isAnimating has to be true');
       return;
     }
@@ -355,7 +353,7 @@ export class Menu {
     // this places the menu into the correct location before it animates in
     // this css class doesn't actually kick off any animations
     this.el.classList.add(SHOW_MENU);
-    this.backdropEl.classList.add(SHOW_BACKDROP);
+    this.backdropEl && this.backdropEl.classList.add(SHOW_BACKDROP);
     this.isAnimating = true;
   }
 
@@ -374,7 +372,7 @@ export class Menu {
 
     if (isOpen) {
       // add css class
-      this.contentEl.classList.add(MENU_CONTENT_OPEN);
+      this.contentEl && this.contentEl.classList.add(MENU_CONTENT_OPEN);
 
       // emit open event
       this.ionOpen.emit();
@@ -382,8 +380,8 @@ export class Menu {
     } else {
       // remove css classes
       this.el.classList.remove(SHOW_MENU);
-      this.contentEl.classList.remove(MENU_CONTENT_OPEN);
-      this.backdropEl.classList.remove(SHOW_BACKDROP);
+      this.contentEl && this.contentEl.classList.remove(MENU_CONTENT_OPEN);
+      this.backdropEl && this.backdropEl.classList.remove(SHOW_BACKDROP);
 
       // emit close event
       this.ionClose.emit();
@@ -438,23 +436,20 @@ export class Menu {
         tappable={false}
         stopPropagation={false}/>,
 
-      <ion-gesture {...{
-        'canStart': this.canStart.bind(this),
-        'onWillStart': this.onWillStart.bind(this),
-        'onStart': this.onDragStart.bind(this),
-        'onMove': this.onDragMove.bind(this),
-        'onEnd': this.onDragEnd.bind(this),
-        'maxEdgeStart': this.maxEdgeStart,
-        'edge': this.side,
-        'disabled': !this.isActive() || !this.swipeEnabled,
-        'gestureName': 'menu-swipe',
-        'gesturePriority': 10,
-        'type': 'pan',
-        'direction': 'x',
-        'threshold': 10,
-        'attachTo': 'window',
-        'disableScroll': true,
-      }}/>
+      <ion-gesture
+        canStart={this.canStart.bind(this)}
+        onWillStart={this.onWillStart.bind(this)}
+        onStart={this.onDragStart.bind(this)}
+        onMove={this.onDragMove.bind(this)}
+        onEnd={this.onDragEnd.bind(this)}
+        disabled={!this.isActive() || !this.swipeEnabled}
+        gestureName='menu-swipe'
+        gesturePriority={10}
+        type='pan'
+        direction='x'
+        threshold={10}
+        attachTo='window'
+        disableScroll={true} />
     ]);
   }
 }
diff --git a/core/src/components/modal/animations/ios.leave.ts b/core/src/components/modal/animations/ios.leave.ts
index 054363ef5f..19494d6a6e 100644
--- a/core/src/components/modal/animations/ios.leave.ts
+++ b/core/src/components/modal/animations/ios.leave.ts
@@ -13,7 +13,7 @@ export default function iosLeaveAnimation(Animation: Animation, baseEl: HTMLElem
   const wrapperAnimation = new Animation();
   const wrapperEl = baseEl.querySelector('.modal-wrapper');
   wrapperAnimation.addElement(wrapperEl);
-  const wrapperElRect = wrapperEl.getBoundingClientRect();
+  const wrapperElRect = wrapperEl!.getBoundingClientRect();
 
   wrapperAnimation.beforeStyles({ 'opacity': 1 })
                   .fromTo('translateY', '0%', `${window.innerHeight - wrapperElRect.top}px`);
diff --git a/core/src/components/modal/modal.tsx b/core/src/components/modal/modal.tsx
index e21047185d..c44b097255 100644
--- a/core/src/components/modal/modal.tsx
+++ b/core/src/components/modal/modal.tsx
@@ -166,9 +166,12 @@ export class Modal implements OverlayInterface {
   @Method()
   async present(): Promise<void> {
     if (this.presented) {
-      return Promise.resolve();
+      return;
     }
     const container = this.el.querySelector(`.modal-wrapper`);
+    if (!container) {
+      throw new Error('container is undefined');
+    }
     const componentProps = {
       ...this.componentProps,
       modal: this.el
diff --git a/core/src/components/nav/nav-util.ts b/core/src/components/nav/nav-util.ts
index 357143e75d..c27df6ac69 100644
--- a/core/src/components/nav/nav-util.ts
+++ b/core/src/components/nav/nav-util.ts
@@ -87,5 +87,4 @@ export interface TransitionInstruction {
   done?: TransitionDoneFn;
   leavingRequiresTransition?: boolean;
   enteringRequiresTransition?: boolean;
-  requiresTransition?: boolean;
 }
diff --git a/core/src/components/nav/nav.tsx b/core/src/components/nav/nav.tsx
index 623c8f073a..0e55244af1 100644
--- a/core/src/components/nav/nav.tsx
+++ b/core/src/components/nav/nav.tsx
@@ -75,13 +75,14 @@ export class Nav implements NavOutlet {
 
   componentDidUnload() {
     for (const view of this.views) {
-      lifecycle(view.element, ViewLifecycle.WillUnload);
+      lifecycle(view.element!, ViewLifecycle.WillUnload);
       view._destroy();
     }
 
     // release swipe back gesture and transition
     this.sbTrns && this.sbTrns.destroy();
-    this.queue = this.views = this.sbTrns = null;
+    this.queue.length = this.views.length = 0;
+    this.sbTrns = undefined;
     this.destroyed = true;
   }
 
@@ -222,7 +223,7 @@ export class Nav implements NavOutlet {
   getRouteId(): RouteID|undefined {
     const active = this.getActive();
     return active ? {
-      id: active.element.tagName,
+      id: active.element!.tagName,
       params: active.params,
       element: active.element
     } : undefined;
@@ -245,6 +246,9 @@ export class Nav implements NavOutlet {
 
   @Method()
   getPrevious(view = this.getActive()): ViewController|undefined {
+    if (!view) {
+      return undefined;
+    }
     const views = this.views;
     const index = views.indexOf(view);
     return (index > 0) ? views[index - 1] : undefined;
@@ -303,9 +307,9 @@ export class Nav implements NavOutlet {
         result.direction
       );
     }
-    ti.resolve(result.hasCompleted);
+    ti.resolve!(result.hasCompleted);
 
-    if (ti.opts.updateURL !== false && this.useRouter) {
+    if (ti.opts!.updateURL !== false && this.useRouter) {
       const router = document.querySelector('ion-router');
       if (router) {
         const direction = (result.direction === NavDirection.Back)
@@ -333,7 +337,7 @@ export class Nav implements NavOutlet {
     if (ti.reject && !this.destroyed) {
       ti.reject(rejectReason);
     } else {
-      ti.resolve(false);
+      ti.resolve!(false);
     }
   }
 
@@ -369,15 +373,24 @@ export class Nav implements NavOutlet {
         throw new Error('no views in the stack to be removed');
       }
 
-      // Needs transition?
-      ti.requiresTransition = (ti.enteringRequiresTransition || ti.leavingRequiresTransition) && enteringView !== leavingView;
-
       if (enteringView && enteringView.state === ViewState.New) {
         await enteringView.init(this.el);
       }
       this.postViewInit(enteringView, leavingView, ti);
 
-      const result = await this.transition(enteringView, leavingView, ti);
+      // Needs transition?
+      const requiresTransition = (ti.enteringRequiresTransition || ti.leavingRequiresTransition) && enteringView !== leavingView;
+      const result = requiresTransition
+        ? await this.transition(enteringView!, leavingView, ti)
+        : {
+          // transition is not required, so we are already done!
+          // they're inserting/removing the views somewhere in the middle or
+          // beginning, so visually nothing needs to animate/transition
+          // resolve immediately because there's no animation that's happening
+          hasCompleted: true,
+          requiresTransition: false
+        };
+
       this.success(result, ti);
       this.ionNavDidChange.emit();
     } catch (rejectReason) {
@@ -403,22 +416,22 @@ export class Nav implements NavOutlet {
       if (index < 0) {
         throw new Error('removeView was not found');
       }
-      ti.removeStart += index;
+      ti.removeStart! += index;
     }
     if (ti.removeStart != null) {
       if (ti.removeStart < 0) {
         ti.removeStart = (viewsLength - 1);
       }
-      if (ti.removeCount < 0) {
+      if (ti.removeCount! < 0) {
         ti.removeCount = (viewsLength - ti.removeStart);
       }
-      ti.leavingRequiresTransition = (ti.removeCount > 0) && ((ti.removeStart + ti.removeCount) === viewsLength);
+      ti.leavingRequiresTransition = (ti.removeCount! > 0) && ((ti.removeStart + ti.removeCount!) === viewsLength);
     }
 
     if (ti.insertViews) {
       // allow -1 to be passed in to auto push it on the end
       // and clean up the index if it's larger then the size of the stack
-      if (ti.insertStart < 0 || ti.insertStart > viewsLength) {
+      if (ti.insertStart! < 0 || ti.insertStart! > viewsLength) {
         ti.insertStart = viewsLength;
       }
       ti.enteringRequiresTransition = (ti.insertStart === viewsLength);
@@ -449,7 +462,7 @@ export class Nav implements NavOutlet {
     ti.insertViews = viewControllers;
   }
 
-  private getEnteringView(ti: TransitionInstruction, leavingView: ViewController): ViewController|undefined {
+  private getEnteringView(ti: TransitionInstruction, leavingView: ViewController|undefined): ViewController|undefined {
     const insertViews = ti.insertViews;
     if (insertViews) {
       // grab the very last view of the views to be inserted
@@ -460,7 +473,7 @@ export class Nav implements NavOutlet {
     const removeStart = ti.removeStart;
     if (removeStart != null) {
       const views = this.views;
-      const removeEnd = removeStart + ti.removeCount;
+      const removeEnd = removeStart + ti.removeCount!;
       for (let i = views.length - 1; i >= 0; i--) {
         const view = views[i];
         if ((i < removeStart || i >= removeEnd) && view !== leavingView) {
@@ -471,19 +484,19 @@ export class Nav implements NavOutlet {
     return undefined;
   }
 
-  private postViewInit(enteringView: ViewController, leavingView: ViewController, ti: TransitionInstruction) {
+  private postViewInit(enteringView: ViewController|undefined, leavingView: ViewController|undefined, ti: TransitionInstruction) {
     assert(leavingView || enteringView, 'Both leavingView and enteringView are null');
     assert(ti.resolve, 'resolve must be valid');
     assert(ti.reject, 'reject must be valid');
 
-    const opts = ti.opts;
+    const opts = ti.opts!;
     const insertViews = ti.insertViews;
     const removeStart = ti.removeStart;
     const removeCount = ti.removeCount;
-    let destroyQueue: ViewController[] = undefined;
+    let destroyQueue: ViewController[]|undefined = undefined;
 
     // there are views to remove
-    if (removeStart != null) {
+    if (removeStart != null && removeCount != null) {
       assert(removeStart >= 0, 'removeStart can not be negative');
       assert(removeCount >= 0, 'removeCount can not be negative');
 
@@ -511,7 +524,7 @@ export class Nav implements NavOutlet {
     // there are views to insert
     if (insertViews) {
       // add the views to the
-      let insertIndex = ti.insertStart;
+      let insertIndex = ti.insertStart!;
       for (const view of insertViews) {
         this.insertViewAt(view, insertIndex);
         insertIndex++;
@@ -542,34 +555,24 @@ export class Nav implements NavOutlet {
     }
   }
 
-  private async transition(enteringView: ViewController, leavingView: ViewController, ti: TransitionInstruction): Promise<NavResult> {
-    if (!ti.requiresTransition) {
-      // transition is not required, so we are already done!
-      // they're inserting/removing the views somewhere in the middle or
-      // beginning, so visually nothing needs to animate/transition
-      // resolve immediately because there's no animation that's happening
-      return Promise.resolve({
-        hasCompleted: true,
-        requiresTransition: false
-      });
-    }
+  private async transition(enteringView: ViewController, leavingView: ViewController|undefined, ti: TransitionInstruction): Promise<NavResult> {
     if (this.sbTrns) {
       this.sbTrns.destroy();
-      this.sbTrns = null;
+      this.sbTrns = undefined;
     }
 
     // we should animate (duration > 0) if the pushed page is not the first one (startup)
     // or if it is a portal (modal, actionsheet, etc.)
+    const opts = ti.opts!;
 
-    const animationBuilder = this.getAnimationBuilder(ti.opts);
+    const animationBuilder = this.getAnimationBuilder(opts);
 
-    const progressAnimation = ti.opts.progressAnimation
+    const progressAnimation = opts.progressAnimation
       ? (animation: Animation) => this.sbTrns = animation
       : undefined;
 
-    const opts = ti.opts;
-    const enteringEl = enteringView && enteringView.element;
-    const leavingEl = leavingView && leavingView.element;
+    const enteringEl = enteringView.element!;
+    const leavingEl = leavingView && leavingView.element!;
     const animationOpts: AnimationOptions = {
       animationCtrl: this.animationCtrl,
       animationBuilder: animationBuilder,
@@ -587,14 +590,16 @@ export class Nav implements NavOutlet {
       leavingEl
     };
     const trns = await transition(animationOpts);
-    return this.transitionFinish(trns, enteringView, leavingView, ti.opts);
+    return this.transitionFinish(trns, enteringView, leavingView, opts);
   }
 
-  private transitionFinish(transition: Animation|void, enteringView: ViewController, leavingView: ViewController, opts: NavOptions): NavResult {
+  private transitionFinish(transition: Animation|null, enteringView: ViewController, leavingView: ViewController | undefined, opts: NavOptions): NavResult {
     const hasCompleted = transition ? transition.hasCompleted : true;
 
     const cleanupView = hasCompleted ? enteringView : leavingView;
-    this.cleanup(cleanupView);
+    if (cleanupView) {
+      this.cleanup(cleanupView);
+    }
 
     // this is the root transition
     // it's safe to destroy this transition
@@ -676,7 +681,7 @@ export class Nav implements NavOutlet {
       } else if (i < activeViewIndex) {
         // this view comes before the active view
         // and it is not a portal then ensure it is hidden
-        view.element.hidden = true;
+        view.element!.hidden = true;
       }
     }
   }
diff --git a/core/src/components/nav/test/nav-controller.spec.ts b/core/src/components/nav/test/nav-controller.spec.ts
index 0b8dd4d5a2..c0c9267ff6 100644
--- a/core/src/components/nav/test/nav-controller.spec.ts
+++ b/core/src/components/nav/test/nav-controller.spec.ts
@@ -977,8 +977,8 @@ describe('NavController', () => {
       nav.push(view1).then((succeded: boolean) => {
         expect(succeded).toEqual(false);
         done();
-      }).catch(() => {
-        fail('should never get here');
+      }).catch((e) => {
+        fail(e);
         done();
       });
       nav.componentDidUnload();
diff --git a/core/src/components/nav/view-controller.ts b/core/src/components/nav/view-controller.ts
index e370df3e2b..20ef85841b 100644
--- a/core/src/components/nav/view-controller.ts
+++ b/core/src/components/nav/view-controller.ts
@@ -6,10 +6,10 @@ import { attachComponent } from '../../utils/framework-delegate';
 
 export class ViewController {
 
-  nav: Nav;
+  nav: Nav|undefined;
   state: ViewState = ViewState.New;
-  element: HTMLElement;
-  delegate: FrameworkDelegate;
+  element: HTMLElement|undefined;
+  delegate: FrameworkDelegate|undefined;
 
   constructor(
     public component: any,
@@ -43,12 +43,12 @@ export class ViewController {
         element.remove();
       }
     }
-    this.nav = null;
+    this.nav = undefined;
     this.state = ViewState.Destroyed;
   }
 }
 
-export function matches(view: ViewController|undefined, id: string, params: ComponentProps): boolean {
+export function matches(view: ViewController|undefined, id: string, params: ComponentProps): view is ViewController {
   if (!view) {
     return false;
   }
diff --git a/core/src/components/picker-column/picker-column.tsx b/core/src/components/picker-column/picker-column.tsx
index 9dfb84a032..f1ce28299d 100644
--- a/core/src/components/picker-column/picker-column.tsx
+++ b/core/src/components/picker-column/picker-column.tsx
@@ -22,7 +22,7 @@ export class PickerColumnCmp {
   private pos: number[] = [];
   private rotateFactor: number;
   private scaleFactor: number;
-  private startY: number;
+  private startY: number|undefined;
   private velocity: number;
   private y = 0;
 
@@ -47,7 +47,7 @@ export class PickerColumnCmp {
 
   componentDidLoad() {
     // get the scrollable element within the column
-    const colEl = this.el.querySelector('.picker-opts');
+    const colEl = this.el.querySelector('.picker-opts')!;
 
     // get the height of one option
     this.optHeight = (colEl.firstElementChild ? colEl.firstElementChild.clientHeight : 0);
@@ -84,13 +84,13 @@ export class PickerColumnCmp {
     let opt: PickerColumnOption;
     let optOffset: number;
     let visible: boolean;
-    let translateY: number;
-    let translateZ: number;
+    let translateY = 0;
+    let translateZ = 0;
     let rotateX: number;
     let transform: string;
     let selected: boolean;
 
-    const parent = this.el.querySelector('.picker-opts');
+    const parent = this.el.querySelector('.picker-opts')!;
     const children = parent.children;
     const length = children.length;
     const selectedIndex = this.col.selectedIndex = Math.min(Math.max(Math.round(-y / this.optHeight), 0), length - 1);
@@ -280,7 +280,7 @@ export class PickerColumnCmp {
     const currentY = detail.currentY;
     this.pos.push(currentY, Date.now());
 
-    if (this.startY === null) {
+    if (this.startY === undefined) {
       return;
     }
 
@@ -310,7 +310,7 @@ export class PickerColumnCmp {
   }
 
   private onDragEnd(detail: GestureDetail) {
-    if (this.startY === null) {
+    if (this.startY === undefined) {
       return;
     }
 
@@ -356,7 +356,7 @@ export class PickerColumnCmp {
       this.update(y, 0, true, true);
     }
 
-    this.startY = null;
+    this.startY = undefined;
     this.decelerate();
   }
 
@@ -371,7 +371,7 @@ export class PickerColumnCmp {
       }
     }
 
-    const selectedIndex = clamp(min, this.col.selectedIndex, max);
+    const selectedIndex = clamp(min, this.col.selectedIndex!, max);
     if (this.col.prevSelected !== selectedIndex) {
       const y = (selectedIndex * this.optHeight) * -1;
       this.velocity = 0;
@@ -394,7 +394,7 @@ export class PickerColumnCmp {
   render() {
     const col = this.col;
 
-    const options = this.col.options.map(o => {
+    const options = col.options.map(o => {
       if (typeof o === 'string') {
         o = { text: o };
       }
@@ -406,7 +406,7 @@ export class PickerColumnCmp {
 
     if (col.prefix) {
       results.push(
-        <div class='picker-prefix' style={{width: col.prefixWidth}}>
+        <div class='picker-prefix' style={{width: col.prefixWidth!}}>
           {col.prefix}
         </div>
       );
@@ -426,12 +426,12 @@ export class PickerColumnCmp {
         threshold={0}
         attachTo='parent'
       ></ion-gesture>,
-      <div class='picker-opts' style={{maxWidth: col.optionsWidth}}>
+      <div class='picker-opts' style={{maxWidth: col.optionsWidth!}}>
         {options.map((o, index) =>
           <button
-            class={{'picker-opt': true, 'picker-opt-disabled': o.disabled}}
+            class={{'picker-opt': true, 'picker-opt-disabled': !!o.disabled}}
             disable-activated
-            onClick={() => this.optClick(event, index)}>
+            onClick={(event) => this.optClick(event, index)}>
             {o.text}
           </button>
         )}
@@ -440,7 +440,7 @@ export class PickerColumnCmp {
 
     if (col.suffix) {
       results.push(
-        <div class='picker-suffix' style={{width: col.suffixWidth}}>
+        <div class='picker-suffix' style={{width: col.suffixWidth!}}>
           {col.suffix}
         </div>
       );
diff --git a/core/src/components/popover/popover.tsx b/core/src/components/popover/popover.tsx
index c18680a199..b4d1dbe4d5 100644
--- a/core/src/components/popover/popover.tsx
+++ b/core/src/components/popover/popover.tsx
@@ -176,9 +176,12 @@ export class Popover implements OverlayInterface {
   @Method()
   async present(): Promise<void> {
     if (this.presented) {
-      return Promise.reject('df');
+      return;
     }
     const container = this.el.querySelector('.popover-content');
+    if (!container) {
+      throw new Error('container is undefined');
+    }
     const data = {
       ...this.componentProps,
       popover: this.el
diff --git a/core/src/components/range/range.tsx b/core/src/components/range/range.tsx
index ad37ddb1af..d7d3c5a603 100644
--- a/core/src/components/range/range.tsx
+++ b/core/src/components/range/range.tsx
@@ -222,7 +222,7 @@ export class Range implements BaseInputComponent {
     const ratio = this.ratio;
     if (this.snaps && ticks) {
       if (this.dualKnobs) {
-        const upperRatio = this.ratioUpper();
+        const upperRatio = this.ratioUpper()!;
 
         ticks.forEach(t => {
           t.active = t.ratio >= ratio && t.ratio <= upperRatio;
@@ -256,7 +256,7 @@ export class Range implements BaseInputComponent {
     }
   }
 
-  update(current: { x?: number; y?: number }, rect: ClientRect, isPressed: boolean) {
+  update(current: { x: number; y: number }, rect: ClientRect, isPressed: boolean) {
     // figure out where the pointer is currently at
     // update the knob being interacted with
     let ratio = clamp(0, (current.x - rect.left) / rect.width, 1);
@@ -365,7 +365,7 @@ export class Range implements BaseInputComponent {
     this.fireFocus();
 
     const current = { x: detail.currentX, y: detail.currentY };
-    const el = this.el.querySelector('.range-slider');
+    const el = this.el.querySelector('.range-slider')!;
     this.rect = el.getBoundingClientRect();
     const rect = this.rect;
 
@@ -432,9 +432,9 @@ export class Range implements BaseInputComponent {
         <div class='range-slider'>
           {this.ticks.map(t =>
             <div
-              style={{ left: t.left }}
+              style={{ left: t.left! }}
               role='presentation'
-              class={{ 'range-tick': true, 'range-tick-active': t.active }}
+              class={{ 'range-tick': true, 'range-tick-active': !!t.active }}
             />
           )}
 
diff --git a/core/src/components/reorder-group/reorder-group.tsx b/core/src/components/reorder-group/reorder-group.tsx
index 3c8341a0b4..efb2d0fc90 100644
--- a/core/src/components/reorder-group/reorder-group.tsx
+++ b/core/src/components/reorder-group/reorder-group.tsx
@@ -23,12 +23,13 @@ export class ReorderIndexes {
   }
 })
 export class ReorderGroup {
-  private selectedItemEl: HTMLElement|null = null;
+
+  private selectedItemEl: HTMLElement|undefined;
   private selectedItemHeight: number;
   private lastToIndex: number;
   private cachedHeights: number[] = [];
   private containerEl: HTMLElement;
-  private scrollEl: HTMLElement;
+  private scrollEl: HTMLElement|null = null;
 
   private scrollElTop: number;
   private scrollElBottom: number;
@@ -64,7 +65,7 @@ export class ReorderGroup {
   }
 
   componentDidLoad() {
-    this.containerEl = this.el.querySelector('ion-gesture');
+    this.containerEl = this.el.querySelector('ion-gesture')!;
     this.scrollEl = this.el.closest('ion-scroll');
     if (!this.disabled) {
       this.disabledChanged(false);
@@ -188,7 +189,7 @@ export class ReorderGroup {
       if (this.selectedItemEl) {
         this.selectedItemEl.style.transition = '';
         this.selectedItemEl.classList.remove(ITEM_REORDER_SELECTED);
-        this.selectedItemEl = null;
+        this.selectedItemEl = undefined;
       }
     };
     if (toIndex === fromIndex) {
diff --git a/core/src/components/router-outlet/route-outlet.tsx b/core/src/components/router-outlet/route-outlet.tsx
index 9b3c7e3a93..332c25cf50 100644
--- a/core/src/components/router-outlet/route-outlet.tsx
+++ b/core/src/components/router-outlet/route-outlet.tsx
@@ -14,7 +14,7 @@ import mdTransitionAnimation from '../nav/animations/md.transition';
 export class RouterOutlet implements NavOutlet {
 
   private isTransitioning = false;
-  private activeEl: HTMLElement = undefined;
+  private activeEl: HTMLElement|undefined;
   private activeComponent: any;
 
   mode: string;
@@ -63,7 +63,7 @@ export class RouterOutlet implements NavOutlet {
   }
 
   @Method()
-  async commit(enteringEl: HTMLElement, leavingEl: HTMLElement, opts?: RouterOutletOptions): Promise<boolean> {
+  async commit(enteringEl: HTMLElement, leavingEl: HTMLElement|undefined, opts?: RouterOutletOptions): Promise<boolean> {
     // isTransitioning acts as a lock to prevent reentering
     if (this.isTransitioning || leavingEl === enteringEl) {
       return false;
diff --git a/core/src/components/router/router.tsx b/core/src/components/router/router.tsx
index 0e64fc2999..2a65045730 100644
--- a/core/src/components/router/router.tsx
+++ b/core/src/components/router/router.tsx
@@ -12,7 +12,7 @@ import { routeRedirect, routerIDsToChain, routerPathToChain } from './utils/matc
 export class Router {
 
   private routes: RouteChain[];
-  private previousPath: string = null;
+  private previousPath: string|null = null;
   private redirects: RouteRedirect[];
   private busy = false;
   private init = false;
@@ -139,16 +139,20 @@ export class Router {
     return this.writeNavStateRoot(path, direction);
   }
 
-  private async writeNavStateRoot(path: string[], direction: RouterDirection): Promise<boolean> {
+  private async writeNavStateRoot(path: string[]|null, direction: RouterDirection): Promise<boolean> {
     if (this.busy) {
       return false;
     }
+    if (!path) {
+      console.error('[ion-router] URL is not part of the routing set');
+      return false;
+    }
     const redirect = routeRedirect(path, this.redirects);
-    let redirectFrom: string[] = null;
+    let redirectFrom: string[]|null = null;
     if (redirect) {
-      this.setPath(redirect.to, direction);
+      this.setPath(redirect.to!, direction);
       redirectFrom = redirect.from;
-      path = redirect.to;
+      path = redirect.to!;
     }
     const chain = routerPathToChain(path, this.routes);
     const changed = await this.writeNavState(document.body, chain, direction);
@@ -158,7 +162,7 @@ export class Router {
     return changed;
   }
 
-  private async writeNavState(node: any, chain: RouteChain, direction: RouterDirection, index = 0): Promise<boolean> {
+  private async writeNavState(node: any, chain: RouteChain | null, direction: RouterDirection, index = 0): Promise<boolean> {
     if (this.busy) {
       return false;
     }
diff --git a/core/src/components/router/utils/dom.ts b/core/src/components/router/utils/dom.ts
index 00d8acb115..62d0d38e41 100644
--- a/core/src/components/router/utils/dom.ts
+++ b/core/src/components/router/utils/dom.ts
@@ -36,10 +36,10 @@ export async function writeNavState(root: HTMLElement|undefined, chain: RouteCha
   }
 }
 
-export function readNavState(root: HTMLElement | null) {
+export function readNavState(root: HTMLElement | undefined) {
   const ids: RouteID[] = [];
   let outlet: NavOutlet|null;
-  let node: HTMLElement|null = root;
+  let node: HTMLElement|undefined = root;
   while (true) {
     outlet = searchNavNode(node);
     if (outlet) {
diff --git a/core/src/components/router/utils/matching.ts b/core/src/components/router/utils/matching.ts
index 111ce5efa1..ad77dba5ee 100644
--- a/core/src/components/router/utils/matching.ts
+++ b/core/src/components/router/utils/matching.ts
@@ -81,7 +81,7 @@ export function matchesPath(path: string[], chain: RouteChain): RouteChain | nul
     return chain.map((route, i) => ({
       id: route.id,
       path: route.path,
-      params: mergeParams(route.params, allparams[i])
+      params: mergeParams(route.params, allparams![i])
     }));
   }
   return chain;
diff --git a/core/src/components/router/utils/parser.ts b/core/src/components/router/utils/parser.ts
index 0c27ae9416..d738a64bda 100644
--- a/core/src/components/router/utils/parser.ts
+++ b/core/src/components/router/utils/parser.ts
@@ -18,23 +18,27 @@ export function readRoutes(root: Element, node = root): RouteTree {
   return (Array.from(node.children) as HTMLIonRouteElement[])
     .filter(el => el.tagName === 'ION-ROUTE' && el.component)
     .map(el => {
+      const component = readProp(el, 'component');
+      if (!component) {
+        throw new Error('component missing in ion-route');
+      }
       return {
         path: parsePath(readProp(el, 'url')),
-        id: readProp(el, 'component').toLowerCase(),
+        id: component.toLowerCase(),
         params: el.componentProps,
         children: readRoutes(root, el)
       };
     });
 }
 
-export function readProp(el: HTMLElement, prop: string): string|undefined {
+export function readProp(el: HTMLElement, prop: string): string|null {
   if (prop in el) {
     return (el as any)[prop];
   }
   if (el.hasAttribute(prop)) {
     return el.getAttribute(prop);
   }
-  return undefined;
+  return null;
 }
 
 export function flattenRouterTree(nodes: RouteTree): RouteChain[] {
diff --git a/core/src/components/router/utils/path.ts b/core/src/components/router/utils/path.ts
index b283e1c125..f81d1666ee 100644
--- a/core/src/components/router/utils/path.ts
+++ b/core/src/components/router/utils/path.ts
@@ -50,7 +50,7 @@ export function readPath(loc: Location, base: string, useHash: boolean): string[
   return null;
 }
 
-export function parsePath(path: string|null|undefined): string[] {
+export function parsePath(path: string|undefined|null): string[] {
   if (path == null) {
     return [''];
   }
diff --git a/core/src/components/scroll/scroll.tsx b/core/src/components/scroll/scroll.tsx
index 08b9b3b10c..c9d0dde356 100644
--- a/core/src/components/scroll/scroll.tsx
+++ b/core/src/components/scroll/scroll.tsx
@@ -61,7 +61,7 @@ export class Scroll {
       scrollTop: 0,
       scrollLeft: 0,
       type: 'scroll',
-      event: undefined,
+      event: undefined!,
       startX: 0,
       startY: 0,
       startTimeStamp: 0,
@@ -132,27 +132,23 @@ export class Scroll {
     // scroll animation loop w/ easing
     // credit https://gist.github.com/dezinezync/5487119
 
-    let promise: Promise<any>;
-    if (done === undefined) {
-      // only create a promise if a done callback wasn't provided
-      // done can be a null, which avoids any functions
-      promise = new Promise(resolve => {
-        done = resolve;
-      });
-    }
+    let resolve!: Function;
+    const promise = new Promise(r => {
+      resolve = r;
+    }).then(() => done && done());
 
     const self = this;
     const el = self.el;
     if (!el) {
       // invalid element
-      done();
+      resolve();
       return promise;
     }
 
     if (duration < 32) {
       el.scrollTop = y;
       el.scrollLeft = x;
-      done();
+      resolve();
       return promise;
     }
 
@@ -172,7 +168,7 @@ export class Scroll {
       if (!self.el || stopScroll || attempts > maxAttempts) {
         self.isScrolling = false;
         el.style.transform = el.style.webkitTransform = '';
-        done();
+        resolve();
         return;
       }
 
@@ -199,7 +195,7 @@ export class Scroll {
         stopScroll = true;
         self.isScrolling = false;
         el.style.transform = el.style.webkitTransform = '';
-        done();
+        resolve();
       }
     }
 
diff --git a/core/src/components/searchbar/searchbar.tsx b/core/src/components/searchbar/searchbar.tsx
index d6531eae48..3cd5c0ad60 100644
--- a/core/src/components/searchbar/searchbar.tsx
+++ b/core/src/components/searchbar/searchbar.tsx
@@ -159,7 +159,7 @@ export class Searchbar {
    * Update the Searchbar input value when the input changes
    */
   inputChanged(ev: Event) {
-    this.value = ev.target && (ev.target as HTMLInputElement).value;
+    this.value = ev.target && (ev.target as HTMLInputElement).value || '';
     this.ionInput.emit(ev);
   }
 
diff --git a/core/src/components/select-option/select-option.tsx b/core/src/components/select-option/select-option.tsx
index 3950e0cafe..bb2870c723 100644
--- a/core/src/components/select-option/select-option.tsx
+++ b/core/src/components/select-option/select-option.tsx
@@ -25,7 +25,7 @@ export class SelectOption {
   /**
    * The text value of the option.
    */
-  @Prop({ mutable: true }) value: string|null = null;
+  @Prop({ mutable: true }) value: string;
 
   /**
    * Emitted when the select option loads.
@@ -42,7 +42,9 @@ export class SelectOption {
   }
 
   componentWillLoad() {
-    this.value = this.value || this.el.textContent;
+    if (this.value == null) {
+      this.value = this.el.textContent || '';
+    }
   }
 
   componentDidLoad() {
diff --git a/core/src/components/select/select.tsx b/core/src/components/select/select.tsx
index d14ffd7a2c..bad752834e 100644
--- a/core/src/components/select/select.tsx
+++ b/core/src/components/select/select.tsx
@@ -96,7 +96,7 @@ export class Select {
   /**
    * the value of the select.
    */
-  @Prop({ mutable: true }) value: string | string[] | null = null;
+  @Prop({ mutable: true }) value: string | string[] | undefined;
 
   /**
    * Emitted when the value has changed.
@@ -146,7 +146,7 @@ export class Select {
       const texts: string[] = [];
 
       this.childOpts.forEach(selectOption => {
-        if ((Array.isArray(this.value) && this.value.indexOf(selectOption.value) > -1) || (selectOption.value === this.value)) {
+        if ((Array.isArray(this.value) && this.value.includes(selectOption.value)) || (selectOption.value === this.value)) {
           if (!selectOption.selected && (this.multiple || !hasChecked)) {
             // correct value for this select option
             // but this select option isn't checked yet
@@ -170,7 +170,7 @@ export class Select {
         }
 
         if (selectOption.selected) {
-          texts.push(selectOption.textContent);
+          texts.push(selectOption.textContent || '');
         }
       });
 
@@ -190,7 +190,7 @@ export class Select {
     const selectOption = ev.target;
     this.childOpts = Array.from(this.el.querySelectorAll('ion-select-option'));
 
-    if (this.value !== undefined && (Array.isArray(this.value) && this.value.indexOf(selectOption.value) > -1) || (selectOption.value === this.value)) {
+    if (this.value != null && (Array.isArray(this.value) && this.value.includes(selectOption.value)) || (selectOption.value === this.value)) {
       // this select has a value and this
       // option equals the correct select value
       // so let's check this select option
@@ -267,7 +267,7 @@ export class Select {
       const checked = this.childOpts.find(o => o.selected);
       if (checked) {
         this.value = checked.value;
-        this.text = checked.textContent;
+        this.text = checked.textContent || '';
       }
     }
     this.emitStyle();
@@ -511,9 +511,19 @@ export class Select {
         <slot></slot>
         { this.mode === 'md' && <ion-ripple-effect tapClick={true}/> }
       </button>,
-      <input type='hidden' name={this.name} value={this.value}/>
+      <input type='hidden' name={this.name} value={parseValue(this.value)}/>
     ];
   }
 }
 
+function parseValue(value: string[]|string|undefined) {
+  if (value == null) {
+    return undefined;
+  }
+  if (typeof value === 'string') {
+    return value;
+  }
+  return value.join(',');
+}
+
 let selectIds = 0;
diff --git a/core/src/components/slides/slides.tsx b/core/src/components/slides/slides.tsx
index 4c1092675e..1121b80ac5 100644
--- a/core/src/components/slides/slides.tsx
+++ b/core/src/components/slides/slides.tsx
@@ -103,9 +103,7 @@ export class Slides {
   @Prop() pager = true;
 
   componentDidLoad() {
-    let timer: number;
-    clearTimeout(timer);
-    timer = setTimeout(this.initSlides.bind(this), 10);
+    setTimeout(this.initSlides.bind(this), 10);
   }
 
   componentDidUnload() {
diff --git a/core/src/components/status-tap/status-tap.tsx b/core/src/components/status-tap/status-tap.tsx
index e213fbbd15..ac0d928545 100644
--- a/core/src/components/status-tap/status-tap.tsx
+++ b/core/src/components/status-tap/status-tap.tsx
@@ -17,7 +17,7 @@ export class StatusTap {
       const height = window.innerWidth;
       const el = document.elementFromPoint(width / 2, height / 2);
       if (!el) {
-        return null;
+        return;
       }
       const scrollEl = el.closest('ion-scroll');
       if (scrollEl) {
diff --git a/core/src/components/tabbar/tabbar.tsx b/core/src/components/tabbar/tabbar.tsx
index 2081cdfde5..fec2ddf2be 100644
--- a/core/src/components/tabbar/tabbar.tsx
+++ b/core/src/components/tabbar/tabbar.tsx
@@ -73,10 +73,10 @@ export class Tabbar {
     const tabs: HTMLIonTabButtonElement[] = Array.from(document.querySelectorAll('ion-tab-button'));
     const scrollLeft = this.scrollEl.scrollLeft;
     const tabsWidth = this.scrollEl.clientWidth;
-    let previous: {tab: HTMLIonTabButtonElement, amount: number};
-    let next: {tab: HTMLIonTabButtonElement, amount: number};
+    let previous: {tab: HTMLIonTabButtonElement, amount: number}|undefined = undefined;
+    let next: {tab: HTMLIonTabButtonElement, amount: number}|undefined = undefined;
 
-    tabs.forEach((tab: HTMLIonTabButtonElement) => {
+    for (const tab of tabs) {
       const left = tab.offsetLeft;
       const right = left + tab.offsetWidth;
 
@@ -88,7 +88,7 @@ export class Tabbar {
         const amount = right - tabsWidth;
         next = {tab, amount};
       }
-    });
+    }
 
     return {previous, next};
   }
@@ -127,11 +127,11 @@ export class Tabbar {
 
   private scrollByTab(direction: 'left' | 'right') {
     this.dom.read(() => {
-      const {previous, next} = this.analyzeTabs(),
-        info = direction === 'right' ? next : previous,
-        amount = info && info.amount;
+      const {previous, next} = this.analyzeTabs();
+      const info = direction === 'right' ? next : previous;
+      const amount = info && info.amount;
 
-      if (info) {
+      if (info && amount) {
         this.scrollEl.scrollToPoint(amount, 0, 250).then(() => {
           this.updateBoundaries();
         });
@@ -184,7 +184,7 @@ export class Tabbar {
           <ion-icon name='arrow-dropleft'/>
         </ion-button>,
 
-        <ion-scroll forceOverscroll={false} ref={(scrollEl: HTMLIonScrollElement) => this.scrollEl = scrollEl}>
+        <ion-scroll forceOverscroll={false} ref={(scrollEl) => this.scrollEl = scrollEl as HTMLIonScrollElement}>
           {tabButtons}
           {ionTabbarHighlight}
         </ion-scroll>,
diff --git a/core/src/components/tabs/tabs.tsx b/core/src/components/tabs/tabs.tsx
index 30637ae875..78e5e19916 100644
--- a/core/src/components/tabs/tabs.tsx
+++ b/core/src/components/tabs/tabs.tsx
@@ -93,12 +93,12 @@ export class Tabs implements NavOutlet {
   }
 
   @Listen('ionTabbarClick')
-  protected tabChange(ev: CustomEvent) {
-    const selectedTab = ev.detail as HTMLIonTabElement;
-    if (this.useRouter && this.selectedTab.href != null) {
+  protected tabChange(ev: CustomEvent<HTMLIonTabElement>) {
+    const selectedTab = ev.detail;
+    if (this.useRouter && selectedTab.href != null) {
       const router = document.querySelector('ion-router');
       if (router) {
-        router.push(this.selectedTab.href);
+        router.push(selectedTab.href);
       }
       return;
     }
@@ -143,7 +143,7 @@ export class Tabs implements NavOutlet {
   }
 
   @Method()
-  getTab(tabOrIndex: string | number | HTMLIonTabElement): HTMLIonTabElement {
+  getTab(tabOrIndex: string | number | HTMLIonTabElement): HTMLIonTabElement|undefined {
     if (typeof tabOrIndex === 'string') {
       return this.tabs.find(tab => tab.getTabId() === tabOrIndex);
     }
@@ -264,9 +264,9 @@ export class Tabs implements NavOutlet {
     return Promise.resolve(false);
   }
 
-  private shouldSwitch(selectedTab: HTMLIonTabElement) {
+  private shouldSwitch(selectedTab: HTMLIonTabElement|undefined): selectedTab is HTMLIonTabElement {
     const leavingTab = this.selectedTab;
-    return selectedTab && selectedTab !== leavingTab && !this.transitioning;
+    return !!(selectedTab && selectedTab !== leavingTab && !this.transitioning);
   }
 
   render() {
diff --git a/core/src/components/textarea/textarea.tsx b/core/src/components/textarea/textarea.tsx
index 7c47c0226b..0c0d23c6ff 100644
--- a/core/src/components/textarea/textarea.tsx
+++ b/core/src/components/textarea/textarea.tsx
@@ -149,7 +149,7 @@ export class Textarea implements TextareaComponent {
    */
   @Watch('value')
   protected valueChanged() {
-    const inputEl = this.el.querySelector('textarea');
+    const inputEl = this.el.querySelector('textarea')!;
     if (inputEl.value !== this.value) {
       inputEl.value = this.value;
     }
@@ -189,7 +189,7 @@ export class Textarea implements TextareaComponent {
   }
 
   inputChanged(ev: Event) {
-    this.value = ev.target && (ev.target as HTMLInputElement).value;
+    this.value = ev.target && (ev.target as HTMLInputElement).value || '';
     this.ionInput.emit(ev);
     this.emitStyle();
   }
diff --git a/core/src/utils/framework-delegate.ts b/core/src/utils/framework-delegate.ts
index 1c86468904..496d429ae6 100644
--- a/core/src/utils/framework-delegate.ts
+++ b/core/src/utils/framework-delegate.ts
@@ -5,7 +5,7 @@ export interface FrameworkDelegate {
   removeViewFromDom(container: any, component: any): Promise<void>;
 }
 
-export function attachComponent(delegate: FrameworkDelegate, container: Element, component: ComponentRef, cssClasses?: string[], componentProps?: {[key: string]: any}): Promise<HTMLElement> {
+export function attachComponent(delegate: FrameworkDelegate|undefined, container: Element, component: ComponentRef, cssClasses?: string[], componentProps?: {[key: string]: any}): Promise<HTMLElement> {
   if (delegate) {
     return delegate.attachViewToDom(container, component, componentProps, cssClasses);
   }
@@ -27,7 +27,7 @@ export function attachComponent(delegate: FrameworkDelegate, container: Element,
   return Promise.resolve(el);
 }
 
-export function detachComponent(delegate: FrameworkDelegate, element: HTMLElement) {
+export function detachComponent(delegate: FrameworkDelegate, element: HTMLElement|undefined) {
   if (element) {
     if (delegate) {
       const container = element.parentElement;
diff --git a/core/src/utils/input-interfaces.ts b/core/src/utils/input-interfaces.ts
index b65229dcf5..bf134df56c 100644
--- a/core/src/utils/input-interfaces.ts
+++ b/core/src/utils/input-interfaces.ts
@@ -142,7 +142,7 @@ export interface SelectInput extends BaseInput {
 
 
 export interface SelectInputChangeEvent {
-  value: string|string[];
+  value: string|string[]|undefined;
   text: string;
 }
 
diff --git a/core/src/utils/show-hide-when-utils.ts b/core/src/utils/show-hide-when-utils.ts
index fb51036461..d88ba61f18 100644
--- a/core/src/utils/show-hide-when-utils.ts
+++ b/core/src/utils/show-hide-when-utils.ts
@@ -97,11 +97,11 @@ const SIZE_TO_MEDIA: any = {
 export interface DisplayWhen {
   calculatedPlatforms: PlatformConfig[];
   config: Config;
-  mediaQuery: string;
-  mode: string;
+  mediaQuery: string|undefined;
+  mode: string|undefined;
   or: boolean;
-  orientation: string;
+  orientation: string|undefined;
   passesTest: boolean;
-  platform: string;
-  size: string;
+  platform: string|undefined;
+  size: string|undefined;
 }
diff --git a/core/src/utils/transition.ts b/core/src/utils/transition.ts
index d5c864a45f..a6188e62dc 100644
--- a/core/src/utils/transition.ts
+++ b/core/src/utils/transition.ts
@@ -6,7 +6,7 @@ export let MyCustomEvent = CustomEvent;
 export function transition(opts: AnimationOptions): Promise<Animation|null> {
   beforeTransition(opts);
 
-  return (opts.enteringEl && opts.leavingEl && (opts.animationBuilder || opts.animation))
+  return (opts.leavingEl && (opts.animationBuilder || opts.animation))
     ? animation(opts)
     : noAnimation(opts); // fast path for no animation
 }
@@ -17,14 +17,12 @@ function beforeTransition(opts: AnimationOptions) {
 
   setZIndex(enteringEl, leavingEl, opts.direction);
 
-  if (enteringEl) {
-    if (opts.showGoBack) {
-      enteringEl.classList.add('can-go-back');
-    } else {
-      enteringEl.classList.remove('can-go-back');
-    }
-    enteringEl.hidden = false;
+  if (opts.showGoBack) {
+    enteringEl.classList.add('can-go-back');
+  } else {
+    enteringEl.classList.remove('can-go-back');
   }
+  enteringEl.hidden = false;
   if (leavingEl) {
     leavingEl.hidden = false;
   }
@@ -54,7 +52,7 @@ async function noAnimation(opts: AnimationOptions): Promise<null> {
 
   fireWillEvents(enteringEl, leavingEl);
   fireDidEvents(enteringEl, leavingEl);
-  return undefined;
+  return null;
 }
 
 async function waitForReady(opts: AnimationOptions, defaultDeep: boolean) {
@@ -105,17 +103,17 @@ function playTransition(transition: Animation, opts: AnimationOptions): Promise<
   return promise;
 }
 
-function fireWillEvents(enteringEl: HTMLElement, leavingEl: HTMLElement) {
+function fireWillEvents(enteringEl: HTMLElement|undefined, leavingEl: HTMLElement|undefined) {
   lifecycle(leavingEl, ViewLifecycle.WillLeave);
   lifecycle(enteringEl, ViewLifecycle.WillEnter);
 }
 
-function fireDidEvents(enteringEl: HTMLElement, leavingEl: HTMLElement) {
+function fireDidEvents(enteringEl: HTMLElement|undefined, leavingEl: HTMLElement|undefined) {
   lifecycle(enteringEl, ViewLifecycle.DidEnter);
   lifecycle(leavingEl, ViewLifecycle.DidLeave);
 }
 
-export function lifecycle(el: HTMLElement, lifecycle: ViewLifecycle) {
+export function lifecycle(el: HTMLElement|undefined, lifecycle: ViewLifecycle) {
   if (el) {
     const event = new MyCustomEvent(lifecycle, {
       bubbles: false,
@@ -129,14 +127,14 @@ export function mockLifecycle(fn: any) {
   MyCustomEvent = fn;
 }
 
-function shallowReady(el: Element): Promise<any> {
+function shallowReady(el: Element|undefined): Promise<any> {
   if (el && (el as any).componentOnReady) {
     return (el as any).componentOnReady();
   }
   return Promise.resolve();
 }
 
-function deepReady(el: Element): Promise<any> {
+function deepReady(el: Element|undefined): Promise<any> {
   if (!el) {
     return Promise.resolve();
   }
@@ -158,7 +156,7 @@ function componentOnReady(el: Element) {
   }
 }
 
-function setZIndex(enteringEl: HTMLElement, leavingEl: HTMLElement, direction: NavDirection) {
+function setZIndex(enteringEl: HTMLElement|undefined, leavingEl: HTMLElement|undefined, direction: NavDirection | undefined) {
   if (enteringEl) {
     enteringEl.style.zIndex = (direction === NavDirection.Back)
       ? '99'
@@ -179,7 +177,7 @@ export const enum ViewLifecycle {
 
 export interface AnimationOptions {
   animationCtrl: HTMLIonAnimationControllerElement;
-  animationBuilder: AnimationBuilder;
+  animationBuilder: AnimationBuilder|undefined;
   animation?: Animation;
   direction?: NavDirection;
   duration?: number;
@@ -189,6 +187,6 @@ export interface AnimationOptions {
   showGoBack?: boolean;
   progressAnimation?: Function;
   enteringEl: HTMLElement;
-  leavingEl: HTMLElement;
+  leavingEl: HTMLElement|undefined;
   baseEl: HTMLElement;
 }
diff --git a/core/tsconfig.json b/core/tsconfig.json
index cdf60fee15..5c7b854221 100644
--- a/core/tsconfig.json
+++ b/core/tsconfig.json
@@ -1,5 +1,6 @@
 {
   "compilerOptions": {
+    "strict": true,
     "alwaysStrict": true,
     "allowSyntheticDefaultImports": true,
     "allowUnreachableCode": false,
diff --git a/core/tslint.json b/core/tslint.json
index 4114b1829d..5547888288 100644
--- a/core/tslint.json
+++ b/core/tslint.json
@@ -2,6 +2,7 @@
   "extends": "tslint-ionic-rules",
   "rules": {
     "no-conditional-assignment": false,
+    "no-non-null-assertion": false,
     "no-unnecessary-type-assertion": false,
     "prefer-for-of": false,
     "no-import-side-effect": false