docs(readme): move breaking changes out, add more, remove duplicates

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README.md
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# Ionic Angular v4
# Ionic
Ionic components will be working toward embracing web components with the following goals:
[Ionic](https://ionicframework.com/) is the open-source mobile app development framework that makes it easy to
build top quality native and progressive web apps with web technologies.
- Users continue to use Angular to develop their apps and components
- No changes to the development and build time experience
- Minimal changes to the users markup
- Reduce build times
- Reduce startup times
- Ionic components are loaded asynchronously by default and without added configuration
For the most part, `ionic-angular` will continue to work the same way, using the same API as previous versions. However, the implementation of some of the less complex components, such as `ion-badge`, will use the standardized web component v1 spec, which ships today in a majority of browsers. Additionally, for browsers that do not support web components, polyfills are added on-demand, which is already built into `ionic-angular` v4.
We will continue to develop and support ionic-angular v3 in the master branch. Ultimately the differences between v3 and v4 are internal, but on the surface it's the same `ionic-angular` as v3. :beers:
Ionic is based on [Web Components](https://www.webcomponents.org/introduction) and comes with many significant performance, usability, and feature improvements over the past versions.
### Breaking Changes
# Packages
#### Dynamic Mode
Components are no longer able to have their mode changed dynamically. You can change the mode before the first render, but after that it will not style properly because only the initial mode's styles are included.
#### Button
##### Markup Changed
Button should now be written as an `<ion-button>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute.
**Old Usage Example:**
```html
<button ion-button (click)="doSomething()">
Default Button
</button>
<a ion-button href="#">
Default Anchor
</a>
```
**New Usage Example:**
```html
<ion-button (click)="doSomething()">
Default Button
</ion-button>
<ion-button href="#">
Default Anchor
</ion-button>
```
##### Icon Attributes Renamed
Previously to style icons inside of a button the following attributes were used: `icon-left`, `icon-right`, (and with the added support of RTL) `icon-start`, `icon-end`.
These have been renamed to the following, and moved from the button element to the icon itself:
| Old Property | New Property | Property Behavior |
|---------------------------|----------------|-----------------------------------------------------------------------|
| `icon-left`, `icon-start` | `slot="start"` | Positions to the left of the button in LTR, and to the right in RTL. |
| `icon-right`, `icon-end` | `slot="end"` | Positions to the right of the button in LTR, and to the left in RTL. |
- [Core](packages/core/README.md)
- [Ionic Angular](packages/ionic-angular/README.md)
**Old Usage Example:**
### Getting Started
```html
<ion-button icon-left>
<ion-icon name="home"></ion-icon>
Icon Left
</ion-button>
<ion-button icon-start>
<ion-icon name="home"></ion-icon>
Icon Left on LTR, Right on RTL
</ion-button>
<ion-button icon-right>
Icon Right
<ion-icon name="home"></ion-icon>
</ion-button>
<ion-button icon-end>
Icon Right on LTR, Left on RTL
<ion-icon name="home"></ion-icon>
</ion-button>
```
**New Usage Example:**
```html
<ion-button>
<ion-icon slot="start" name="home"></ion-icon>
Icon Left on LTR, Right on RTL
</ion-button>
<ion-button>
Icon Right on LTR, Left on RTL
<ion-icon slot="end" name="home"></ion-icon>
</ion-button>
```
Start a new project by following our quick [Getting Started guide](https://ionicframework.com/getting-started/).
We would love to hear from you! If you have any feedback or run into issues using our framework, please file
an [issue](https://github.com/ionic-team/ionic/issues/new) on this repository.
#### Item
### Contributing
##### Label Required
Previously an `ion-label` would automatically get added to an `ion-item` if one wasn't provided. Now an `ion-label` should always be added if the item is used to display text.
```html
<ion-item>
<ion-label>Item Label</ion-label>
</ion-item>
```
##### Attributes Renamed
Previously to position elements inside of an `ion-item` the following attributes were used: `item-left`, `item-right`, (and with the added support of RTL) `item-start`, `item-end`.
These have been renamed to the following:
| Old Property | New Property | Property Behavior |
|---------------------------|----------------|---------------------------------------------------------------------|
| `item-left`, `item-start` | `slot="start"` | Positions to the left of the item in LTR, and to the right in RTL. |
| `item-right`, `item-end` | `slot="end"` | Positions to the right of the item in LTR, and to the left in RTL. |
Thanks for your interest in contributing! Read up on our guidelines for
[contributing](https://github.com/ionic-team/ionic/blob/master/.github/CONTRIBUTING.md)
and then look through our issues with a [help wanted](https://github.com/ionic-team/ionic/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22)
label.
**Old Usage Example:**
### Examples
```html
<ion-item>
<div item-left>Left</div>
<ion-label>Item Label</ion-label>
<div item-right>Right</div>
</ion-item>
<ion-item>
<div item-start>Left on LTR, Right on RTL</div>
<ion-label>Item Label</ion-label>
<div item-end>Right on LTR, Left on RTL</div>
</ion-item>
```
**New Usage Example:**
```html
<ion-item>
<div slot="start">Left on LTR, Right on RTL</div>
<ion-label>Item Label</ion-label>
<div slot="end">Right on LTR, Left on RTL</div>
</ion-item>
```
#### Toolbar
##### Attributes Renamed
The attributes to position an `ion-buttons` element inside of a toolbar have been renamed, as well as the behavior attached to the name. We noticed there was some confusion behind the behavior of the `start` and `end` attributes, and with the new support for RTL we wanted to make the behavior of these match RTL. In order to do this we had to rename the old `start`/`end` to something that makes more sense with their behavior.
The names and behavior of each of the properties was previously:
| Old Property | Property Behavior |
|--------------|--------------------------------------------------------------------------------------------------------------|
| `start` | Positions element to the left of the content in `ios` mode, and directly to the right in `md` and `wp` mode. |
| `end` | Positions element to the right of the content in `ios` mode, and to the far right in `md` and `wp` mode. |
| `left` | Positions element to the left of all other elements. |
| `right` | Positions element to the right of all other elements. |
The properties have been renamed to the following:
| Old Property | New Property | Property Behavior |
|--------------|---------------------|------------------------------------------------------------------------------------------------------------------|
| `start` | `slot="mode-start"` | Positions element to the `left` of the content in `ios` mode, and directly to the `right` in `md` and `wp` mode. |
| `end` | `slot="mode-end"` | Positions element to the `right` of the content in `ios` mode, and to the far right in `md` and `wp` mode. |
| `left` | `slot="start"` | Positions element to the `left` of all other elements in `LTR`, and to the `right` in `RTL`. |
| `right` | `slot="end"` | Positions element to the `right` of all other elements in `LTR`, and to the `left` in `RTL`. |
### Testing
Update your `package.json` to match the following dependencies, remove the existing node_modules directory, and then run npm install:
```
"@ionic/app-scripts": "nightly"
"ionic-angular": "canary"
```
The [Ionic Conference App](https://github.com/ionic-team/ionic-conference-app) is a full featured Ionic app.
It is the perfect starting point for learning and building your own app.
### Future Goals
As Ionic components migrate to the web component standard, a goal of ours is to have Ionic components easily work within all of the popular frameworks.
[![npm version](https://badge.fury.io/js/ionic-angular.svg)](https://badge.fury.io/js/ionic-angular)
[![Circle CI](https://circleci.com/gh/ionic-team/ionic.svg?style=shield&circle-token=:circle-token)](https://circleci.com/gh/ionic-team/ionic)
### Ionic V1
The source code for Ionic V1 has been moved to [ionic-team/ionic-v1](https://github.com/ionic-team/ionic-v1).
Please open any issues and pull requests related to Ionic V1 on that repository.

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# Breaking Changes
A list of the breaking changes introduced in Ionic Angular v4.
- [Dynamic Mode](#dynamic-mode)
- [Button](#button)
- [FAB](#fab)
- [Fixed Content](#fixed-content)
- [Icon](#icon)
- [Item](#item)
- [Segment](#segment)
- [Toolbar](#toolbar)
## Dynamic Mode
Components are no longer able to have their mode changed dynamically. You can change the mode before the first render, but after that it will not style properly because only the initial mode's styles are included.
## Button
### Markup Changed
Button should now be written as an `<ion-button>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute.
**Old Usage Example:**
```html
<button ion-button (click)="doSomething()">
Default Button
</button>
<a ion-button href="#">
Default Anchor
</a>
```
**New Usage Example:**
```html
<ion-button (click)="doSomething()">
Default Button
</ion-button>
<ion-button href="#">
Default Anchor
</ion-button>
```
### Icon Attributes Renamed
Previously to style icons inside of a button the following attributes were used: `icon-left`, `icon-right`, (and with the added support of RTL) `icon-start`, `icon-end`.
These have been renamed to the following, and moved from the button element to the icon itself:
| Old Property | New Property | Property Behavior |
|---------------------------|----------------|-----------------------------------------------------------------------|
| `icon-left`, `icon-start` | `slot="start"` | Positions to the left of the button in LTR, and to the right in RTL. |
| `icon-right`, `icon-end` | `slot="end"` | Positions to the right of the button in LTR, and to the left in RTL. |
**Old Usage Example:**
```html
<ion-button icon-left>
<ion-icon name="home"></ion-icon>
Icon Left
</ion-button>
<ion-button icon-start>
<ion-icon name="home"></ion-icon>
Icon Left on LTR, Right on RTL
</ion-button>
<ion-button icon-right>
Icon Right
<ion-icon name="home"></ion-icon>
</ion-button>
<ion-button icon-end>
Icon Right on LTR, Left on RTL
<ion-icon name="home"></ion-icon>
</ion-button>
```
**New Usage Example:**
```html
<ion-button>
<ion-icon slot="start" name="home"></ion-icon>
Icon Left on LTR, Right on RTL
</ion-button>
<ion-button>
Icon Right on LTR, Left on RTL
<ion-icon slot="end" name="home"></ion-icon>
</ion-button>
```
## FAB
### Markup Changed
Buttons inside of an `<ion-fab>` container should now be written as an `<ion-fab-button>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute.
**Old Usage Example:**
```html
<ion-fab top right edge>
<button ion-fab>
<ion-icon name="add"></ion-icon>
</button>
<ion-fab-list>
<button ion-fab>
<ion-icon name="logo-facebook"></ion-icon>
</button>
<button ion-fab>
<ion-icon name="logo-twitter"></ion-icon>
</button>
<button ion-fab>
<ion-icon name="logo-vimeo"></ion-icon>
</button>
<button ion-fab>
<ion-icon name="logo-googleplus"></ion-icon>
</button>
</ion-fab-list>
</ion-fab>
```
**New Usage Example:**
```html
<ion-fab top right edge>
<ion-fab-button>
<ion-icon name="add"></ion-icon>
</ion-fab-button>
<ion-fab-list>
<ion-fab-button>
<ion-icon name="logo-facebook"></ion-icon>
</ion-fab-button>
<ion-fab-button>
<ion-icon name="logo-twitter"></ion-icon>
</ion-fab-button>
<ion-fab-button>
<ion-icon name="logo-vimeo"></ion-icon>
</ion-fab-button>
<ion-fab-button>
<ion-icon name="logo-googleplus"></ion-icon>
</ion-fab-button>
</ion-fab-list>
</ion-fab>
```
### Fixed Content
The `<ion-fab>` container was previously placed inside of the fixed content by default. Now, any fixed content should go inside of the `<ion-fixed>` container.
**Old Usage Example:**
```html
<ion-content>
<ion-fab top right edge>
<!-- fab buttons and lists -->
</ion-fab>
Scrollable Content
</ion-content>
```
**New Usage Example:**
```html
<ion-fixed>
<ion-fab top right edge>
<!-- fab buttons and lists -->
</ion-fab>
</ion-fixed>
<ion-content>
Scrollable Content
</ion-content>
```
## Icon
### Fonts Removed
Icons have been refactored to use SVGs instead of fonts. Ionic will only fetch the SVG for the icon when it is needed, instead of having a large font file that is always loaded in.
If any `CSS` is being overridden for an icon it will need to change to override the SVG itself. Below is a usage example of the differences in changing the icon color.
**Old Usage Example:**
```css
.icon {
color: #000;
}
```
**New Usage Example:**
```css
.icon {
fill: #000;
}
```
## Item
### Markup Changed
Item should now be written as an `<ion-item>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute, and a button tag based on the presence of a click. Otherwise, it will render a div.
**Old Usage Example:**
```html
<ion-item>
Default Item
</ion-item>
<button ion-item (click)="doSomething()">
Button Item
</button>
<a ion-item href="#">
Anchor Item
</a>
```
**New Usage Example:**
```html
<ion-item>
Default Item
</ion-item>
<ion-item (click)="doSomething()">
Button Item
</ion-item>
<ion-item href="#">
Anchor Item
</ion-item>
```
### Label Required
Previously an `ion-label` would automatically get added to an `ion-item` if one wasn't provided. Now an `ion-label` should always be added if the item is used to display text.
```html
<ion-item>
<ion-label>Item Label</ion-label>
</ion-item>
```
### Attributes Renamed
Previously to position elements inside of an `ion-item` the following attributes were used: `item-left`, `item-right`, (and with the added support of RTL) `item-start`, `item-end`.
These have been renamed to the following:
| Old Property | New Property | Property Behavior |
|---------------------------|----------------|---------------------------------------------------------------------|
| `item-left`, `item-start` | `slot="start"` | Positions to the left of the item in LTR, and to the right in RTL. |
| `item-right`, `item-end` | `slot="end"` | Positions to the right of the item in LTR, and to the left in RTL. |
**Old Usage Example:**
```html
<ion-item>
<div item-left>Left</div>
<ion-label>Item Label</ion-label>
<div item-right>Right</div>
</ion-item>
<ion-item>
<div item-start>Left on LTR, Right on RTL</div>
<ion-label>Item Label</ion-label>
<div item-end>Right on LTR, Left on RTL</div>
</ion-item>
```
**New Usage Example:**
```html
<ion-item>
<div slot="start">Left on LTR, Right on RTL</div>
<ion-label>Item Label</ion-label>
<div slot="end">Right on LTR, Left on RTL</div>
</ion-item>
```
## Segment
The markup hasn't changed for Segments, but now writing `<ion-segment-button>` will render a native button element inside of it.
## Toolbar
### Attributes Renamed
The attributes to position an `ion-buttons` element inside of a toolbar have been renamed, as well as the behavior attached to the name. We noticed there was some confusion behind the behavior of the `start` and `end` attributes, and with the new support for RTL we wanted to make the behavior of these match RTL. In order to do this we had to rename the old `start`/`end` to something that makes more sense with their behavior.
The names and behavior of each of the properties was previously:
| Old Property | Property Behavior |
|--------------|--------------------------------------------------------------------------------------------------------------|
| `start` | Positions element to the left of the content in `ios` mode, and directly to the right in `md` and `wp` mode. |
| `end` | Positions element to the right of the content in `ios` mode, and to the far right in `md` and `wp` mode. |
| `left` | Positions element to the left of all other elements. |
| `right` | Positions element to the right of all other elements. |
The properties have been renamed to the following:
| Old Property | New Property | Property Behavior |
|--------------|---------------------|------------------------------------------------------------------------------------------------------------------|
| `start` | `slot="mode-start"` | Positions element to the `left` of the content in `ios` mode, and directly to the `right` in `md` and `wp` mode. |
| `end` | `slot="mode-end"` | Positions element to the `right` of the content in `ios` mode, and to the far right in `md` and `wp` mode. |
| `left` | `slot="start"` | Positions element to the `left` of all other elements in `LTR`, and to the `right` in `RTL`. |
| `right` | `slot="end"` | Positions element to the `right` of all other elements in `LTR`, and to the `left` in `RTL`. |

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@ -16,294 +16,7 @@ We will continue to develop and support ionic-angular v3 in the master branch. U
### Breaking Changes
#### Dynamic Mode
Components are no longer able to have their mode changed dynamically. You can change the mode before the first render, but after that it will not style properly because only the initial mode's styles are included.
#### Button
##### Markup Changed
Button should now be written as an `<ion-button>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute.
**Old Usage Example:**
```html
<button ion-button (click)="doSomething()">
Default Button
</button>
<a ion-button href="#">
Default Anchor
</a>
```
**New Usage Example:**
```html
<ion-button (click)="doSomething()">
Default Button
</ion-button>
<ion-button href="#">
Default Anchor
</ion-button>
```
##### Icon Attributes Renamed
Previously to style icons inside of a button the following attributes were used: `icon-left`, `icon-right`, (and with the added support of RTL) `icon-start`, `icon-end`.
These have been renamed to the following, and moved from the button element to the icon itself:
| Old Property | New Property | Property Behavior |
|---------------------------|----------------|-----------------------------------------------------------------------|
| `icon-left`, `icon-start` | `slot="start"` | Positions to the left of the button in LTR, and to the right in RTL. |
| `icon-right`, `icon-end` | `slot="end"` | Positions to the right of the button in LTR, and to the left in RTL. |
**Old Usage Example:**
```html
<ion-button icon-left>
<ion-icon name="home"></ion-icon>
Icon Left
</ion-button>
<ion-button icon-start>
<ion-icon name="home"></ion-icon>
Icon Left on LTR, Right on RTL
</ion-button>
<ion-button icon-right>
Icon Right
<ion-icon name="home"></ion-icon>
</ion-button>
<ion-button icon-end>
Icon Right on LTR, Left on RTL
<ion-icon name="home"></ion-icon>
</ion-button>
```
**New Usage Example:**
```html
<ion-button>
<ion-icon slot="start" name="home"></ion-icon>
Icon Left on LTR, Right on RTL
</ion-button>
<ion-button>
Icon Right on LTR, Left on RTL
<ion-icon slot="end" name="home"></ion-icon>
</ion-button>
```
#### FAB
##### Markup Changed
Buttons inside of an `<ion-fab>` container should now be written as an `<ion-fab-button>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute.
**Old Usage Example:**
```html
<ion-fab top right edge>
<button ion-fab>
<ion-icon name="add"></ion-icon>
</button>
<ion-fab-list>
<button ion-fab>
<ion-icon name="logo-facebook"></ion-icon>
</button>
<button ion-fab>
<ion-icon name="logo-twitter"></ion-icon>
</button>
<button ion-fab>
<ion-icon name="logo-vimeo"></ion-icon>
</button>
<button ion-fab>
<ion-icon name="logo-googleplus"></ion-icon>
</button>
</ion-fab-list>
</ion-fab>
```
**New Usage Example:**
```html
<ion-fab top right edge>
<ion-fab-button>
<ion-icon name="add"></ion-icon>
</ion-fab-button>
<ion-fab-list>
<ion-fab-button>
<ion-icon name="logo-facebook"></ion-icon>
</ion-fab-button>
<ion-fab-button>
<ion-icon name="logo-twitter"></ion-icon>
</ion-fab-button>
<ion-fab-button>
<ion-icon name="logo-vimeo"></ion-icon>
</ion-fab-button>
<ion-fab-button>
<ion-icon name="logo-googleplus"></ion-icon>
</ion-fab-button>
</ion-fab-list>
</ion-fab>
```
##### Fixed Content
The `<ion-fab>` container was previously placed inside of the fixed content by default. Now, any fixed content should go inside of the `<ion-fixed>` container.
**Old Usage Example:**
```html
<ion-content>
<ion-fab top right edge>
<ion-fab-button>Main Button</ion-fab-button>
<ion-fab-list>
<ion-fab-button>List Button</ion-fab-button>
<ion-fab-button>List Button</ion-fab-button>
<ion-fab-button>List Button</ion-fab-button>
<ion-fab-button>List Button</ion-fab-button>
</ion-fab-list>
</ion-fab>
Scrollable Content
</ion-content>
```
**New Usage Example:**
```html
<ion-fixed>
<ion-fab top right edge>
<ion-fab-button>Main Button</ion-fab-button>
<ion-fab-list>
<ion-fab-button>List Button</ion-fab-button>
<ion-fab-button>List Button</ion-fab-button>
<ion-fab-button>List Button</ion-fab-button>
<ion-fab-button>List Button</ion-fab-button>
</ion-fab-list>
</ion-fab>
</ion-fixed>
<ion-content>
Scrollable Content
</ion-content>
```
#### Item
##### Markup Changed
Item should now be written as an `<ion-item>` element. Ionic will determine when to render an anchor tag based on the presence of an `href` attribute, and a button tag based on the presence of a click. Otherwise, it will render a div.
**Old Usage Example:**
```html
<ion-item>
Default Item
</ion-item>
<button ion-item (click)="doSomething()">
Button Item
</button>
<a ion-item href="#">
Anchor Item
</a>
```
**New Usage Example:**
```html
<ion-item>
Default Item
</ion-item>
<ion-item (click)="doSomething()">
Button Item
</ion-item>
<ion-item href="#">
Anchor Item
</ion-item>
```
##### Label Required
Previously an `ion-label` would automatically get added to an `ion-item` if one wasn't provided. Now an `ion-label` should always be added if the item is used to display text.
```html
<ion-item>
<ion-label>Item Label</ion-label>
</ion-item>
```
##### Attributes Renamed
Previously to position elements inside of an `ion-item` the following attributes were used: `item-left`, `item-right`, (and with the added support of RTL) `item-start`, `item-end`.
These have been renamed to the following:
| Old Property | New Property | Property Behavior |
|---------------------------|----------------|---------------------------------------------------------------------|
| `item-left`, `item-start` | `slot="start"` | Positions to the left of the item in LTR, and to the right in RTL. |
| `item-right`, `item-end` | `slot="end"` | Positions to the right of the item in LTR, and to the left in RTL. |
**Old Usage Example:**
```html
<ion-item>
<div item-left>Left</div>
<ion-label>Item Label</ion-label>
<div item-right>Right</div>
</ion-item>
<ion-item>
<div item-start>Left on LTR, Right on RTL</div>
<ion-label>Item Label</ion-label>
<div item-end>Right on LTR, Left on RTL</div>
</ion-item>
```
**New Usage Example:**
```html
<ion-item>
<div slot="start">Left on LTR, Right on RTL</div>
<ion-label>Item Label</ion-label>
<div slot="end">Right on LTR, Left on RTL</div>
</ion-item>
```
#### Toolbar
##### Attributes Renamed
The attributes to position an `ion-buttons` element inside of a toolbar have been renamed, as well as the behavior attached to the name. We noticed there was some confusion behind the behavior of the `start` and `end` attributes, and with the new support for RTL we wanted to make the behavior of these match RTL. In order to do this we had to rename the old `start`/`end` to something that makes more sense with their behavior.
The names and behavior of each of the properties was previously:
| Old Property | Property Behavior |
|--------------|--------------------------------------------------------------------------------------------------------------|
| `start` | Positions element to the left of the content in `ios` mode, and directly to the right in `md` and `wp` mode. |
| `end` | Positions element to the right of the content in `ios` mode, and to the far right in `md` and `wp` mode. |
| `left` | Positions element to the left of all other elements. |
| `right` | Positions element to the right of all other elements. |
The properties have been renamed to the following:
| Old Property | New Property | Property Behavior |
|--------------|---------------------|------------------------------------------------------------------------------------------------------------------|
| `start` | `slot="mode-start"` | Positions element to the `left` of the content in `ios` mode, and directly to the `right` in `md` and `wp` mode. |
| `end` | `slot="mode-end"` | Positions element to the `right` of the content in `ios` mode, and to the far right in `md` and `wp` mode. |
| `left` | `slot="start"` | Positions element to the `left` of all other elements in `LTR`, and to the `right` in `RTL`. |
| `right` | `slot="end"` | Positions element to the `right` of all other elements in `LTR`, and to the `left` in `RTL`. |
See the [BREAKING](BREAKING.md) file for a full list.
### Testing
@ -311,11 +24,6 @@ The properties have been renamed to the following:
Update your `package.json` to match the following dependencies, remove the existing node_modules directory, and then run npm install:
```
"@ionic/app-scripts": "nightly"
"ionic-angular": "canary"
```
### Future Goals
As Ionic components migrate to the web component standard, a goal of ours is to have Ionic components easily work within all of the popular frameworks.
"@ionic/app-scripts": "nightly"
"ionic-angular": "canary"
```