npm package: @rdlabo/ionic-angular-collect-icons
Description: This library is used to uniquely group the ionIcons in a project, and generate for export ionIcons file. In small projects, it is difficult to manage `addIcons()` of ionIcons each time, so we automated it.
Latest version: 2.0.0

# Ionic Angular Collect Icons

## What is this?

This library is used to uniquely group the ionIcons in a project, and generate for export ionIcons file. In small projects, it is difficult to manage `addIcons()` of ionIcons each time, so we automated it.

- development: Stress-free development by add all icons at `addIcons`.
- Production: Automatically collect and update the ionIcon used in the template prior to build.

Of course, to maximize bundle size reduction, it is important to load a minimum number of icons at each Component lazy loading. This is a compromise to speed up development.

This project is based [ionic-team/ionic-angular-standalone-codemods](https://github.com/ionic-team/ionic-angular-standalone-codemods) .

## 💖 Support This Project

Enjoying this project? Your support helps keep it alive and growing!  
Sponsoring means you directly contribute to new features, improvements, and maintenance.

[Become a Sponsor →](https://github.com/sponsors/rdlabo)

## Requirements

- Node.js >= 20
- ionicons >= 6.0.0

## Initialize

```bash
npm install @rdlabo/ionic-angular-collect-icons --save-dev
```

### 🤖 Automatic Configuration

```bash
npx @rdlabo/ionic-angular-collect-icons --initialize true
```

### 📝 Manual Configuration

#### 1. Run the CLI

```bash
npx @rdlabo/ionic-angular-collect-icons
```

This will generate `src/use-icons.ts`.

#### 2. Import the generated file in your `main.ts` ( or `app.config.ts` ) file:

```diff
+ import { addIcons } from 'ionicons';
+ import * as allIcons from 'ionicons/icons';
+ import * as useIcons from '../use-icons';

  if (environment.production) {
    enableProdMode();
  }

+  addIcons(environment.production ? useIcons : allIcons);
```

#### 3. Remove other `addIcons` calls in class constructor

```diff
  @Component(/* ... */)
  export class ExampleComponent {
    constructor() {
-     addIcons(useIcons);
    }
  }
```

## Usage

```bash
npx @rdlabo/ionic-angular-collect-icons
```

### Let's automate run

It is inefficient to run commands each time before running a production build, so put them in an npm script to automate the process. Example:

```diff
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
+   "prebuild": "npx @rdlabo/ionic-angular-collect-icons",
```

> [!WARNING]
> This method cannot be used for production builds without using the npm script.

## Optional

### --dry-run [boolean]

If you want to see what changes would be made without actually writing them to files, set `true`. The default is `false`.

```bash
npx @rdlabo/ionic-angular-collect-icons --dry-run true
```

### --interactive [boolean]

If you want to set all CLI option using the prompts, set `true`. This can be used to check only the results in a Dry run.
The default is `false`.

```bash
npx @rdlabo/ionic-angular-collect-icons --interactive true
```

### --initialize [boolean]

If you want to initialize `addIcons` automatically, you can use the `--initialize` flag. The default is `false`. The CLI add lines:

```diff
+ import { addIcons } from 'ionicons';
+ import * as allIcons from 'ionicons/icons';
+ import * as useIcons from '../use-icons';

  if (environment.production) {
    enableProdMode();
  }

+  addIcons(environment.production ? useIcons : allIcons);
```

the CLI will add lines at the file that has `enableProdMode()`. Of course, it can also be set manually.

And remove other `addIcons` calls in class constructor.

```diff
  @Component(/* ... */)
  export class ExampleComponent {
    constructor() {
-     addIcons(useIcons);
    }
  }
```

```bash
npx @rdlabo/ionic-angular-collect-icons --initialize true
```

### --project-path [string]

If you want to specify the path to the project, you can use the `--project-path` flag. The default is the current directory.

```bash
npx @rdlabo/ionic-angular-collect-icons --project-path /path/to/project
```

Target files are under the `src` directory from the specified path.

- path/to/project + `src/**/*.ts`
- path/to/project + `src/**/*.html`

### --icon-path [string]

Default create file is (path/to/project +) `src/use-icons.ts`. If you want to specify the file name, you can use the `--icon-path` flag.

```bash
npx @rdlabo/ionic-angular-collect-icons  --icon-path src/other-use-icons.ts
```

## FAQ

- Can run addIcons in main.ts?

Yes. Please check this issue: https://github.com/ionic-team/ionic-framework/issues/28445#issuecomment-1789028722

> You're more than welcome to register them in main.ts or app.component.ts. You can then use them anywhere in your application. However, the initial bundle size may increase because the icons need to be loaded up front.

- Support Unit Test?

Unit test at ChromeHeadless don't read `main.ts`. So, you need to add `addIcons` in each test, or add `addIcons` in `src/test.ts`.

- Support binding icon name?

No, and we do not plan to support this program. For example, this kind of code is difficult to follow until it is displayed.

```ts
@Component({
  selector: "app-example",
  template: ` <ion-icon [name]="iconName"></ion-icon> `,
})
export class ExampleComponent {
  iconName = "add";

  ionViewWillEnter() {
    setTimeout(() => {
      this.iconName = "remove";
    }, 1000);
  }
}
```

If you are doing this kind of complex processing, please import manually.

Alternatively, if you have a limited number of icons you're binding to, you can add a block in your template as a "hint."

```html
<!-- This is a trick to get ionic-angular-collect-icons
     to include the icons, but it will never render. -->
@if(false) {
<ion-icon name="home"></ion-icon>
<ion-icon name="people"></ion-icon>
}
```

It's not ideal, but it will help to maintain the automation.

- Why not addIcons in each component?

This is to minimize diffs by libraries. I did not like to have every component change on every run. I wanted to keep the diff as small as possible.

## Developing

1. Clone this repository.
2. Run `npm install` to install dependencies
3. Run `npm run dev` to start the dev server, this will watch for changes and rebuild the project
4. Run `npm run start` to start the CLI and test the code mods

### Testing

This project uses [Vitest](https://vitest.dev/) for unit testing.

| Command              | Description                 |
| -------------------- | --------------------------- |
| `npm run test`       | Run all tests               |
| `npm run test:watch` | Run all tests in watch mode |
| `npm run coverage`   | Run tests with coverage     |

### Formatting

This project uses [Prettier](https://prettier.io/) for code formatting.

Run `npm run fmt` to format all files in the project.

### Additional Resources

- [Typescript AST Explorer](https://ts-ast-viewer.com/)
- [ts-morph API Docs](https://ts-morph.com/)
- [Clack Prompts Docs](https://github.com/natemoo-re/clack/tree/main/packages/prompts#readme)