chore(): prep move from ionic to core for use of vanilla

packages/core/src/utils/helpers.ts

@@ -0,0 +1,95 @@
+
+export function isDef(v: any): boolean { return v !== undefined && v !== null; }
+
+export function isUndef(v: any): boolean { return v === undefined || v === null; }
+
+export function isArray(v: any): v is Array<any> { return Array.isArray(v); }
+
+export function isObject(v: any): v is Object { return v !== null && typeof v === 'object'; }
+
+export function isBoolean(v: any): v is (boolean) { return typeof v === 'boolean'; }
+
+export function isString(v: any): v is (string) { return typeof v === 'string'; }
+
+export function isNumber(v: any): v is (number) { return typeof v === 'number'; }
+
+export function isFunction(v: any): v is (Function) { return typeof v === 'function'; }
+
+export function isStringOrNumber(v: any): v is (string | number) { return isString(v) || isNumber(v); }
+
+export function toDashCase(str: string) {
+  return str.replace(/([A-Z])/g, (g) => '-' + g[0].toLowerCase());
+}
+
+export function noop() {}
+
+export function pointerCoordX(ev: any): number {
+  // get X coordinates for either a mouse click
+  // or a touch depending on the given event
+  if (ev) {
+    var changedTouches = ev.changedTouches;
+    if (changedTouches && changedTouches.length > 0) {
+      return changedTouches[0].clientX;
+    }
+    if (ev.pageX !== undefined) {
+      return ev.pageX;
+    }
+  }
+  return 0;
+}
+
+export function pointerCoordY(ev: any): number {
+  // get Y coordinates for either a mouse click
+  // or a touch depending on the given event
+  if (ev) {
+    var changedTouches = ev.changedTouches;
+    if (changedTouches && changedTouches.length > 0) {
+      return changedTouches[0].clientY;
+    }
+    if (ev.pageY !== undefined) {
+      return ev.pageY;
+    }
+  }
+  return 0;
+}
+
+export function getElementReference(elm: any, ref: string) {
+  if (ref === 'child') {
+    return elm.firstElementChild;
+  }
+  if (ref === 'parent') {
+    return getParentElement(elm) || elm;
+  }
+  if (ref === 'body') {
+    return elm.ownerDocument.body;
+  }
+  if (ref === 'document') {
+    return elm.ownerDocument;
+  }
+  if (ref === 'window') {
+    return elm.ownerDocument.defaultView;
+  }
+  return elm;
+}
+
+export function getParentElement(elm: any) {
+  if (elm.parentElement ) {
+    // normal element with a parent element
+    return elm.parentElement;
+  }
+  if (elm.parentNode && elm.parentNode.host) {
+    // shadow dom's document fragment
+    return elm.parentNode.host;
+  }
+  return null;
+}
+
+export function applyStyles(elm: HTMLElement, styles: {[styleProp: string]: string|number}) {
+  const styleProps = Object.keys(styles);
+
+  if (elm) {
+    for (var i = 0; i < styleProps.length; i++) {
+      (<any>elm.style)[styleProps[i]] = styles[styleProps[i]];
+    }
+  }
+}