ng-loader

ng-loader is a loader for Webpack that can transform *.ng files into AngularJs Components.

Note: [email protected] had a different purpose than version 2.*, it was currently migrated to ng-module-loader.

What is Webpack?

webpack is a tool to build JavaScript modules in your application. To start using webpack from its cli or api, follow the Installation instructions. webpack simplifies your workflow by quickly constructing a dependency graph of your application and bundling them in the right order. webpack can be configured to customise optimisations to your code, to split vendor/css/js code for production, run a development server that hot-reloads your code without page refresh and many such cool features. Learn more about why you should use webpack.

Understanding Loaders

Loaders are transformations that are applied on a resource file of your application. They are functions (running in Node.js) that take the source of a resource file as the parameter and return the new source. Learn more about loaders.

Install

npm install --save-dev ng-loader

Usage

Use the loader either via your Webpack config.

Via webpack config (recommended)

module.exports = {
  module: {
    rules: [
      {
        test: /\.ng$/,
        use: [ 'ng-loader' ]
      }
    ]
  }
}

Passing parameters:

You can also configure ng-loader and the sub-loaders for your components. Bellow is the default configuration.

{
  test: /\.ng$/,
  use: [
    {
      loader: 'ng-loader'
      options: {
        hotReload: true,
        loaders: {
          html: [
            'html-loader'
          ],
          js: [
            {
              loader: 'babel-loader',
              options: {
                presets: ['es2015'],
                plugins: ['transform-runtime'],
                comments: false
              }
            }
          ],
          sass: [
            'style-loader',
            'css-loader'
          ]
        }
      }
    }
  ]
}

Angular Component

In AngularJS, a Component is a special kind of directive that uses a simpler configuration which is suitable for a component-based application structure.

This makes it easier to write an app in a way that's similar to using Web Components or using the new Angular's style of application architecture.

Advantages of Components:

• simpler configuration than plain directives
• promote sane defaults and best practices
• optimized for component-based architecture
• writing component directives will make it easier to upgrade to Angular

You can see the full documentation here.

The *.ng file

A *.ng file is a custom file format that uses HTML-like syntax to describe a angular component. Each *.ng file consists of three types of top-level language blocks: <template>, <script> and <style>:

<!-- ./src/components/my-component.ng -->
<template>
    <h1 class="ui header">
        {{ $ctrl.description }}
    </h1>
</template>

<script>
    export default {
        controller(){
            this.description = 'A AngularJs Component!'
        }
    }
</script>

<style lang="sass">
    @import '~semantic-ui';
</style>

ng-loader will parse the file, extract each language block, pipe them through other loaders if necessary, and finally assemble them back into a CommonJS module whose module.exports is a AngularJs Component options object.

Language Blocks

<template>

• Default language: html.

• Each *.ng file can contain at most one <template> block at a time.

• Contents will be extracted as a string and used as the template option for the compiled AngularJs Component.

<script>

• Default language: js (ES2015 is supported automatically if babel-loader or buble-loader is detected).

• Each *.ng file can contain at most one <script> block at a time.

• The script is executed in a CommonJS like environment (just like a normal .js module bundled via Webpack), which means you can require() other dependencies. And with ES2015 support, you can also use the import and export syntax.

    // tag script inside ng file ./src/components/my-component.ng
    exports default {
        controller () {
            this.description = 'A AngularJs Component';
        }
    };

Registering your component:

import * as angular from 'angular';

import myComponent from './components/my-component.ng';

angular.module('app', []).component('myComponent', myComponent);

You can also return an array with the component data. The first item represents the component name and the second component options.

    // tag script inside ng file ./src/components/my-component.ng
    exports default ['myComponent', {
        controller: () => {
            this.description = 'AngularJs';
        }
    }];

and register as follows

import * as angular from 'angular';

import myComponent from './components/my-component.ng';

angular.module('app', []).component.apply(angular, myComponent);

// ES2015
// .component(...myComponent)

<style>

• Default Language: css;
• Multiple <style> tags are supported in a single *.ng file;
• By default, contents will be extracted and dynamically inserted into the document's <head> as an actual <style> tag using style-loader;

The component

<my-component></my-component>

Hot Reload

This feature is provided by ng-hot-reload-api

Syntax Highlighting

You can treat *.ng files as HTML in your editor.

License

MIT