|
|
|
|
@ -1,12 +1,17 @@
|
|
|
|
|
include ../_util-fns
|
|
|
|
|
|
|
|
|
|
// The docs standard h4 style uppercases, making code terms unreadable. Override it.
|
|
|
|
|
style.
|
|
|
|
|
h4 {font-size: 17px !important; text-transform: none !important;}
|
|
|
|
|
.syntax { font-family: Consolas, 'Lucida Sans', Courier, sans-serif; color: black; font-size: 85%; }
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
[**Webpack**](https://webpack.github.io/) is a popular module bundler,
|
|
|
|
|
a tool for bundling application source code in convenient _chunks_
|
|
|
|
|
and for loading that code from a server into a browser.
|
|
|
|
|
|
|
|
|
|
It's an excellent alternative to the *SystemJS* approach we use throughout the documentation.
|
|
|
|
|
In this guide we get a taste of Webpack and how to use it with Angular applications.
|
|
|
|
|
It's an excellent alternative to the *SystemJS* approach used elsewhere in the documentation.
|
|
|
|
|
This guide offers a taste of Webpack and explains how to use it with Angular applications.
|
|
|
|
|
|
|
|
|
|
<a id="top"></a>
|
|
|
|
|
## Table of contents
|
|
|
|
|
@ -40,17 +45,17 @@ include ../_util-fns
|
|
|
|
|
|
|
|
|
|
Webpack roams over your application source code,
|
|
|
|
|
looking for `import` statements, building a dependency graph, and emitting one (or more) _bundles_.
|
|
|
|
|
With plugin "loaders" Webpack can preprocess and minify different non-JavaScript files such as TypeScript, SASS, and LESS files.
|
|
|
|
|
With plugins and rules, Webpack can preprocess and minify different non-JavaScript files such as TypeScript, SASS, and LESS files.
|
|
|
|
|
|
|
|
|
|
We determine what Webpack does and how it does it with a JavaScript configuration file, `webpack.config.js`.
|
|
|
|
|
You determine what Webpack does and how it does it with a JavaScript configuration file, `webpack.config.js`.
|
|
|
|
|
|
|
|
|
|
a(id="entries-outputs")
|
|
|
|
|
.l-main-section
|
|
|
|
|
:marked
|
|
|
|
|
### Entries and outputs
|
|
|
|
|
|
|
|
|
|
We feed Webpack with one or more *entry* files and let it find and incorporate the dependencies that radiate from those entries.
|
|
|
|
|
In this example, we start from the application's root file, `src/app.ts`:
|
|
|
|
|
You supply Webpack with one or more *entry* files and let it find and incorporate the dependencies that radiate from those entries.
|
|
|
|
|
The one entry point file in this example is the application's root file, `src/app.ts`:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'one-entry', 'webpack.config.js (single entry)')(format=".")
|
|
|
|
|
|
|
|
|
|
@ -60,38 +65,37 @@ a(id="entries-outputs")
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'app-example', 'src/app.ts')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Here it sees that we're importing *@angular/core* so it adds that to its dependency list for (potential) inclusion in the bundle.
|
|
|
|
|
It opens *@angular/core* and follows _its_ network of `import` statements until it has built the complete dependency graph from `app.ts` down.
|
|
|
|
|
It sees that you're importing *@angular/core* so it adds that to its dependency list for (potential) inclusion in the bundle.
|
|
|
|
|
It opens the *@angular/core* file and follows _its_ network of `import` statements until it has built the complete dependency graph from `app.ts` down.
|
|
|
|
|
|
|
|
|
|
Then it **outputs** these files to the `app.js` _bundle file_ designated in configuration:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'one-output', 'webpack.config.js (single output)')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
This `app.js` output bundle is a single JavaScript file that contains our application source and its dependencies.
|
|
|
|
|
We'll load it later with a <script> tag in our index.html.
|
|
|
|
|
This `app.js` output bundle is a single JavaScript file that contains the application source and its dependencies.
|
|
|
|
|
You'll load it later with a `<script>` tag in the `index.html`.
|
|
|
|
|
|
|
|
|
|
#### Multiple bundles
|
|
|
|
|
We probably do not want one giant bundle of everything.
|
|
|
|
|
We'll likely prefer to separate our volatile application app code from comparatively stable vendor code modules.
|
|
|
|
|
You probably don't want one giant bundle of everything.
|
|
|
|
|
It's preferable to separate the volatile application app code from comparatively stable vendor code modules.
|
|
|
|
|
|
|
|
|
|
We change the configuration so that we have two entry points, `app.ts` and `vendor.ts`:
|
|
|
|
|
Change the configuration so that it has two entry points, `app.ts` and `vendor.ts`:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'two-entries','webpack.config.js (two entries)')(format=".")
|
|
|
|
|
:marked
|
|
|
|
|
Webpack constructs two separate dependency graphs
|
|
|
|
|
and emits *two* bundle files, one called `app.js` containing only our application code and
|
|
|
|
|
and emits *two* bundle files, one called `app.js` containing only the application code and
|
|
|
|
|
another called `vendor.js` with all the vendor dependencies.
|
|
|
|
|
|
|
|
|
|
.l-sub-section
|
|
|
|
|
:marked
|
|
|
|
|
The `[name]` in the output name is a Webpack *placeholder* that is replaced with the entry names.
|
|
|
|
|
`app` and `vendor` respectively.
|
|
|
|
|
|
|
|
|
|
We need a plugin to make this work; we'll [cover that later](#commons-chunk-plugin) in the chapter.
|
|
|
|
|
The `[name]` in the output name is a *placeholder* that a Webpack plugin replaces with the entry names,
|
|
|
|
|
`app` and `vendor`. Plugins are [covered later](#commons-chunk-plugin) in the guide.
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
We met `app.ts` earlier. We wrote `vendor.ts` such that it imports the vendor modules we need:
|
|
|
|
|
To tell Webpack what belongs in the vendor bundle,
|
|
|
|
|
add a `vendor.ts` file that only imports the application's third-party modules:
|
|
|
|
|
+makeExample('webpack/ts/src/vendor.ts', null,'src/vendor.ts')(format=".")
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
@ -101,9 +105,9 @@ a(id="loaders")
|
|
|
|
|
### Loaders
|
|
|
|
|
|
|
|
|
|
Webpack can bundle any kind of file: JavaScript, TypeScript, CSS, SASS, LESS, images, html, fonts, whatever.
|
|
|
|
|
Webpack itself doesn't know what to do with a non-JavaScript file.
|
|
|
|
|
We teach it to process such files into JavaScript with *loaders*.
|
|
|
|
|
Here we configure loaders for TypeScript and CSS:
|
|
|
|
|
Webpack _itself_ only understands JavaScript files.
|
|
|
|
|
Teach it to transform non-JavaScript file into their JavaScript equivalents with *loaders*.
|
|
|
|
|
Configure loaders for TypeScript and CSS as follows.
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'loaders', 'webpack.config.js (two entries)')(format=".")
|
|
|
|
|
|
|
|
|
|
@ -118,7 +122,7 @@ a(id="loaders")
|
|
|
|
|
The first `import` file matches the `.ts` pattern so Webpack processes it with the `awesome-typescript-loader`.
|
|
|
|
|
The imported file doesn't match the second pattern so its loader is ignored.
|
|
|
|
|
|
|
|
|
|
The second `import` matches the second `.css` pattern for which we have *two* loaders chained by the (!) character.
|
|
|
|
|
The second `import` matches the second `.css` pattern for which you have *two* loaders chained by the (!) character.
|
|
|
|
|
Webpack applies chained loaders *right to left* so it applies
|
|
|
|
|
the `css` loader first (to flatten CSS `@import` and `url(...)` statements) and
|
|
|
|
|
then the `style` loader (to append the css inside *<style>* elements on the page).
|
|
|
|
|
@ -129,7 +133,7 @@ a(id="plugins")
|
|
|
|
|
### Plugins
|
|
|
|
|
|
|
|
|
|
Webpack has a build pipeline with well-defined phases.
|
|
|
|
|
We tap into that pipeline with plugins such as the `uglify` minification plugin:
|
|
|
|
|
Tap into that pipeline with plugins such as the `uglify` minification plugin:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'plugins')(format=".")
|
|
|
|
|
|
|
|
|
|
@ -138,12 +142,12 @@ a(id="configure-webpack")
|
|
|
|
|
:marked
|
|
|
|
|
## Configure Webpack
|
|
|
|
|
|
|
|
|
|
After that brief orientation, we are ready to build our own Webpack configuration for Angular apps.
|
|
|
|
|
After that brief orientation, you are ready to build your own Webpack configuration for Angular apps.
|
|
|
|
|
|
|
|
|
|
Begin by setting up the development environment.
|
|
|
|
|
|
|
|
|
|
Create a **new project folder**
|
|
|
|
|
code-example(format="").
|
|
|
|
|
code-example(language="sh" class="code-shell").
|
|
|
|
|
mkdir angular-webpack
|
|
|
|
|
cd angular-webpack
|
|
|
|
|
|
|
|
|
|
@ -165,79 +169,114 @@ code-example(format="").
|
|
|
|
|
)
|
|
|
|
|
.l-sub-section
|
|
|
|
|
:marked
|
|
|
|
|
Many of these files and much of their content should be familiar from other Angular documentation chapters.
|
|
|
|
|
Many of these files should be familiar from other Angular documentation guides,
|
|
|
|
|
especially the [_Typescript configuration_](../guide/typescript-configuration.html) and
|
|
|
|
|
[_npm packages_](../guide/npm-packages.html) guides.
|
|
|
|
|
|
|
|
|
|
Learn about the `package.json` in the [npm packages](../guide/npm-packages.html) chapter.
|
|
|
|
|
We require packages for Webpack use in addition to the ones listed in that chapter.
|
|
|
|
|
Webpack, the plugins, and the loaders are also installed as packages.
|
|
|
|
|
They are listed in the updated `packages.json`.
|
|
|
|
|
|
|
|
|
|
Learn about `tsconfig.json` in the [Typescript configuration](../guide/typescript-configuration.html) chapter.
|
|
|
|
|
:marked
|
|
|
|
|
Open a terminal/console window and install the *npm* packages with `npm install`.
|
|
|
|
|
Open a terminal window and (re)install the *npm* packages
|
|
|
|
|
code-example(language="sh" class="code-shell").
|
|
|
|
|
npm install
|
|
|
|
|
|
|
|
|
|
a#polyfills
|
|
|
|
|
.l-main-section
|
|
|
|
|
:marked
|
|
|
|
|
### Polyfills
|
|
|
|
|
|
|
|
|
|
You'll need polyfills to run an Angular application in most browsers as explained
|
|
|
|
|
in the [_Browser Support_](browser-support.html) guide.
|
|
|
|
|
|
|
|
|
|
Polyfills should be bundled separately from the application and vendor bundles.
|
|
|
|
|
Add a `polyfills.ts` like this one to the `src/` folder.
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/src/polyfills.ts', '', 'src/polyfills.ts')(format=".")
|
|
|
|
|
|
|
|
|
|
.callout.is-critical
|
|
|
|
|
header Loading polyfills
|
|
|
|
|
:marked
|
|
|
|
|
Load `zone.js` early within `polyfills.ts`, immediately after the other ES6 and metadata shims.
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Because this bundle file will load first, `polyfills.ts` is also a good place to configure the browser environment
|
|
|
|
|
for production or development.
|
|
|
|
|
|
|
|
|
|
a(id="common-configuration")
|
|
|
|
|
.l-main-section
|
|
|
|
|
:marked
|
|
|
|
|
### Common Configuration
|
|
|
|
|
|
|
|
|
|
We will define separate configurations for development, production, and test environments.
|
|
|
|
|
All three have some configuration in common.
|
|
|
|
|
We'll gather that common configuration in a separate file called `webpack.common.js`.
|
|
|
|
|
Developers typically have separate configurations for development, production, and test environments.
|
|
|
|
|
All three have a lot of configuration in common.
|
|
|
|
|
|
|
|
|
|
Let's see the entire file and then walk through it a section at a time:
|
|
|
|
|
Gather the common configuration in a file called `webpack.common.js`.
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.common.js', null, 'config/webpack.common.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Webpack is a NodeJS-based tool so its configuration is a JavaScript _commonjs_ module file
|
|
|
|
|
that begins with `require` statements as such files do.
|
|
|
|
|
### Inside _webpack.common.js_
|
|
|
|
|
Webpack is a NodeJS-based tool that reads configuration from a JavaScript _commonjs_ module file.
|
|
|
|
|
|
|
|
|
|
The configuration exports several objects, beginning with the *entries* described earlier:
|
|
|
|
|
The configuration imports dependencies with `require` statements
|
|
|
|
|
and exports several objects as properties of a `module.exports` object.
|
|
|
|
|
|
|
|
|
|
* [`entries`](#common-entries) - the entry-point files that define the bundles.
|
|
|
|
|
* [`resolve`](#common-resolve) - how to resolve file names when they lack extensions.
|
|
|
|
|
* [`module.rules`](#common-rules) - `module` is an object with `rules` for deciding how files are loaded.
|
|
|
|
|
* [`plugins`](#common-plugins) - creates instances of the plugins.
|
|
|
|
|
|
|
|
|
|
a#common-entries
|
|
|
|
|
:marked
|
|
|
|
|
#### _entries_
|
|
|
|
|
|
|
|
|
|
The first export is the *entries* object, described above:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.common.js', 'entries', 'config/webpack.common.js')(format=".")
|
|
|
|
|
:marked
|
|
|
|
|
We are splitting our application into three bundles:
|
|
|
|
|
This *entries* object defines the three bundles:
|
|
|
|
|
|
|
|
|
|
* polyfills - the standard polyfills we require to run Angular applications in most modern browsers.
|
|
|
|
|
* vendor - the vendor files we need: Angular, lodash, bootstrap.css...
|
|
|
|
|
* app - our application code.
|
|
|
|
|
* polyfills - the polyfills needed to run Angular applications in most modern browsers.
|
|
|
|
|
* vendor - the third-party dependencies such as Angular, lodash, and bootstrap.css.
|
|
|
|
|
* app - the application code.
|
|
|
|
|
|
|
|
|
|
.callout.is-critical
|
|
|
|
|
header Loading polyfills
|
|
|
|
|
a#common-resolve
|
|
|
|
|
:marked
|
|
|
|
|
Load Zone.js early, immediately after the other ES6 and metadata shims.
|
|
|
|
|
#### _resolve_ extension-less imports
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Our app will `import` dozens if not hundreds of JavaScript and TypeScript files.
|
|
|
|
|
We _might_ write `import` statements with explicit extensions as in this example:
|
|
|
|
|
The app will `import` dozens if not hundreds of JavaScript and TypeScript files.
|
|
|
|
|
You could write `import` statements with explicit extensions like this example:
|
|
|
|
|
+makeExample('webpack/ts-snippets/webpack.config.snippets.ts', 'single-import')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
But most of our `import` statements won't mention the extension at all.
|
|
|
|
|
So we tell Webpack to _resolve_ module file requests by looking for matching files with
|
|
|
|
|
|
|
|
|
|
* an explicit extension (signified by the empty extension string, `''`) or
|
|
|
|
|
* `.js` extension (for regular JavaScript files and pre-compiled TypeScript files) or
|
|
|
|
|
* `.ts` extension.
|
|
|
|
|
But most `import` statements don't mention the extension at all.
|
|
|
|
|
Tell Webpack to resolve extension-less file requests by looking for matching files with
|
|
|
|
|
`.ts` extension or `.js` extension (for regular JavaScript files and pre-compiled TypeScript files).
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.common.js', 'resolve', 'config/webpack.common.js')(format=".")
|
|
|
|
|
.l-sub-section
|
|
|
|
|
:marked
|
|
|
|
|
We could add `.css` and `.html` later if we want Webpack to resolve extension-less files with _those_ extension too.
|
|
|
|
|
If Webpack should resolve extension-less files for styles and HTML,
|
|
|
|
|
add `.css` and `.html` to the list.
|
|
|
|
|
|
|
|
|
|
a#common-rules
|
|
|
|
|
:marked
|
|
|
|
|
Next we specify the loaders:
|
|
|
|
|
:marked
|
|
|
|
|
#### _module.rules_
|
|
|
|
|
Rules tell Webpack which loaders to use for each file (AKA _module_):
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.common.js', 'loaders', 'config/webpack.common.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
* awesome-typescript-loader - a loader to transpile our Typescript code to ES5, guided by the `tsconfig.json` file
|
|
|
|
|
* awesome-typescript-loader - a loader to transpile the Typescript code to ES5, guided by the `tsconfig.json` file
|
|
|
|
|
* angular2-template-loader - loads angular components' template and styles
|
|
|
|
|
* html - for component templates
|
|
|
|
|
* images/fonts - Images and fonts are bundled as well.
|
|
|
|
|
* css - The pattern matches application-wide styles; the second handles component-scoped styles (the ones specified in a component's `styleUrls` metadata property)
|
|
|
|
|
.l-sub-section
|
|
|
|
|
:marked
|
|
|
|
|
The first pattern excludes `.css` files within the `/src/app` directories where our component-scoped styles sit.
|
|
|
|
|
The first pattern excludes `.css` files within the `/src/app` directories where the component-scoped styles sit.
|
|
|
|
|
It includes only `.css` files located at or above `/src`; these are the application-wide styles.
|
|
|
|
|
The `ExtractTextPlugin` (described below) applies the `style` and `css` loaders to these files.
|
|
|
|
|
|
|
|
|
|
@ -246,10 +285,13 @@ a(id="common-configuration")
|
|
|
|
|
|
|
|
|
|
.l-sub-section
|
|
|
|
|
:marked
|
|
|
|
|
Multiple loaders can be also chained using the array notation.
|
|
|
|
|
Multiple loaders can be chained using the array notation.
|
|
|
|
|
|
|
|
|
|
a#common-plugins
|
|
|
|
|
:marked
|
|
|
|
|
Finally we add two plugins:
|
|
|
|
|
:marked
|
|
|
|
|
#### _plugins_
|
|
|
|
|
Finally, create instances of three plugins:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.common.js', 'plugins', 'config/webpack.common.js')(format=".")
|
|
|
|
|
|
|
|
|
|
@ -257,23 +299,24 @@ a(id="commons-chunk-plugin")
|
|
|
|
|
:marked
|
|
|
|
|
#### *CommonsChunkPlugin*
|
|
|
|
|
|
|
|
|
|
We want the `app.js` bundle to contain only app code and the `vendor.js` bundle to contain only the vendor code.
|
|
|
|
|
The `app.js` bundle should contain only application code. All vendor code belongs in the `vendor.js` bundle.
|
|
|
|
|
|
|
|
|
|
Our application code `imports` vendor code. Webpack is not smart enough to keep the vendor code out of the `app.js` bundle.
|
|
|
|
|
We rely on the `CommonsChunkPlugin` to do that job.
|
|
|
|
|
Of course the application code `imports` vendor code.
|
|
|
|
|
Webpack itself is not smart enough to keep the vendor code out of the `app.js` bundle.
|
|
|
|
|
The `CommonsChunkPlugin` does that job.
|
|
|
|
|
.l-sub-section
|
|
|
|
|
:marked
|
|
|
|
|
It identifies the hierarchy among three _chunks_: `app` -> `vendor` -> `polyfills`.
|
|
|
|
|
The `CommonsChunkPlugin` identifies the hierarchy among three _chunks_: `app` -> `vendor` -> `polyfills`.
|
|
|
|
|
Where Webpack finds that `app` has shared dependencies with `vendor`, it removes them from `app`.
|
|
|
|
|
It would do the same if `vendor` and `polyfills` had shared dependencies (which they don't).
|
|
|
|
|
It would remove `polyfills` from `vendor` if they shared dependencies (which they don't).
|
|
|
|
|
|
|
|
|
|
a(id="html-webpack-plugin")
|
|
|
|
|
:marked
|
|
|
|
|
#### *HtmlWebpackPlugin*
|
|
|
|
|
|
|
|
|
|
Webpack generates a number of js and css files.
|
|
|
|
|
We _could_ insert them into our `index.html` _manually_. That would be tedious and error-prone.
|
|
|
|
|
Webpack can inject those scripts and links for us with the `HtmlWebpackPlugin`.
|
|
|
|
|
You _could_ insert them into the `index.html` _manually_. That would be tedious and error-prone.
|
|
|
|
|
Webpack can inject those scripts and links for you with the `HtmlWebpackPlugin`.
|
|
|
|
|
|
|
|
|
|
a(id="environment-configuration")
|
|
|
|
|
.l-main-section
|
|
|
|
|
@ -281,8 +324,8 @@ a(id="environment-configuration")
|
|
|
|
|
### Environment-specific configuration
|
|
|
|
|
|
|
|
|
|
The `webpack.common.js` configuration file does most of the heavy lifting.
|
|
|
|
|
We create separate, environment-specific configuration files that build on `webpack.common`
|
|
|
|
|
by merging into it the peculiarities particular to their target environments.
|
|
|
|
|
Create separate, environment-specific configuration files that build on `webpack.common`
|
|
|
|
|
by merging into it the peculiarities particular to the target environments.
|
|
|
|
|
|
|
|
|
|
These files tend to be short and simple.
|
|
|
|
|
|
|
|
|
|
@ -291,29 +334,29 @@ a(id="development-configuration")
|
|
|
|
|
:marked
|
|
|
|
|
### Development Configuration
|
|
|
|
|
|
|
|
|
|
Here is the development configuration file, `webpack.dev.js`
|
|
|
|
|
Here is the `webpack.dev.js` development configuration file.
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.dev.js', null, 'config/webpack.dev.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
The development build relies on the Webpack development server which we configure near the bottom of the file.
|
|
|
|
|
The development build relies on the Webpack development server, configured near the bottom of the file.
|
|
|
|
|
|
|
|
|
|
Although we tell Webpack to put output bundles in the `dist` folder,
|
|
|
|
|
Although you tell Webpack to put output bundles in the `dist` folder,
|
|
|
|
|
the dev server keeps all bundles in memory; it doesn't write them to disk.
|
|
|
|
|
So we won't find any files in the `dist` folder (at least not any generated from `this development build`).
|
|
|
|
|
You won't find any files in the `dist` folder (at least not any generated from `this development build`).
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
The `HtmlWebpackPlugin` (added in `webpack.common.js`) use the *publicPath* and the *filename* settings to generate
|
|
|
|
|
appropriate <script> and <link> tags into the `index.html`.
|
|
|
|
|
|
|
|
|
|
Our CSS are buried inside our Javascript bundles by default. The `ExtractTextPlugin` extracts them into
|
|
|
|
|
The CSS styles are buried inside the Javascript bundles by default. The `ExtractTextPlugin` extracts them into
|
|
|
|
|
external `.css` files that the `HtmlWebpackPlugin` inscribes as <link> tags into the `index.html`.
|
|
|
|
|
|
|
|
|
|
Refer to the Webpack documentation for details on these and other configuration options in this file
|
|
|
|
|
|
|
|
|
|
Grab the app code at the end of this guide and try:
|
|
|
|
|
|
|
|
|
|
code-example(format="").
|
|
|
|
|
code-example(language="sh" class="code-shell").
|
|
|
|
|
npm start
|
|
|
|
|
|
|
|
|
|
a(id="production-configuration")
|
|
|
|
|
@ -326,29 +369,30 @@ a(id="production-configuration")
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.prod.js', null, 'config/webpack.prod.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
We don't use a development server. We're expected to deploy the application and its dependencies to a real production server.
|
|
|
|
|
You'll deploy the application and its dependencies to a real production server.
|
|
|
|
|
You won't deploy the artifacts needed only in development.
|
|
|
|
|
|
|
|
|
|
This time the output bundle files are physically placed in the `dist` folder.
|
|
|
|
|
Put the production output bundle files in the `dist` folder.
|
|
|
|
|
|
|
|
|
|
Webpack generates file names with cache-busting hash.
|
|
|
|
|
Thanks to the `HtmlWebpackPlugin` we don't have to update the `index.html` file when the hashes changes.
|
|
|
|
|
Thanks to the `HtmlWebpackPlugin`, you don't have to update the `index.html` file when the hashes changes.
|
|
|
|
|
|
|
|
|
|
There are additional plugins:
|
|
|
|
|
|
|
|
|
|
* **NoErrorsPlugin** - stops the build if there is any error.
|
|
|
|
|
* **DedupePlugin** - detects identical (and nearly identical) files and removes them from the output.
|
|
|
|
|
* **NoEmitOnErrorsPlugin** - stops the build if there is an error.
|
|
|
|
|
* **UglifyJsPlugin** - minifies the bundles.
|
|
|
|
|
* **ExtractTextPlugin** - extracts embedded css as external files, adding cache-busting hash to the filename.
|
|
|
|
|
* **DefinePlugin** - use to define environment variables that we can reference within our application.
|
|
|
|
|
* **DefinePlugin** - use to define environment variables that you can reference within the application.
|
|
|
|
|
* **LoaderOptionsPlugins** - to override options of certain loaders.
|
|
|
|
|
|
|
|
|
|
Thanks to the *DefinePlugin* and the `ENV` variable defined at top, we can enable Angular production mode like this:
|
|
|
|
|
Thanks to the *DefinePlugin* and the `ENV` variable defined at top, you can enable Angular production mode like this:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/src/main.ts', 'enable-prod')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Grab the app code at the end of this guide and try:
|
|
|
|
|
|
|
|
|
|
code-example(format="").
|
|
|
|
|
code-example(language="sh" class="code-shell").
|
|
|
|
|
npm run build
|
|
|
|
|
|
|
|
|
|
a(id="test-configuration")
|
|
|
|
|
@ -356,25 +400,23 @@ a(id="test-configuration")
|
|
|
|
|
:marked
|
|
|
|
|
### Test Configuration
|
|
|
|
|
|
|
|
|
|
We don't need much configuration to run unit tests.
|
|
|
|
|
We don't need the loaders and plugins that we declared for our development and production builds.
|
|
|
|
|
We probably don't need to load and process the application-wide styles files for unit tests and doing so would slow us down;
|
|
|
|
|
we'll use the `null` loader for those CSS.
|
|
|
|
|
You don't need much configuration to run unit tests.
|
|
|
|
|
You don't need the loaders and plugins that you declared for your development and production builds.
|
|
|
|
|
You probably don't need to load and process the application-wide styles files for unit tests and doing so would slow you down;
|
|
|
|
|
you'll use the `null` loader for those CSS files.
|
|
|
|
|
|
|
|
|
|
We could merge our test configuration into the `webpack.common` configuration and override the parts we don't want or need.
|
|
|
|
|
You could merge the test configuration into the `webpack.common` configuration and override the parts you don't want or need.
|
|
|
|
|
But it might be simpler to start over with a completely fresh configuration.
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/webpack.test.js', null, 'config/webpack.test.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Here's our karma configuration:
|
|
|
|
|
Reconfigure karma to use webpack to run the tests:
|
|
|
|
|
|
|
|
|
|
+makeExample('webpack/ts/config/karma.conf.js', null, 'config/karma.conf.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
We're telling Karma to use webpack to run the tests.
|
|
|
|
|
|
|
|
|
|
We don't precompile our TypeScript; Webpack transpiles our Typescript files on the fly, in memory, and feeds the emitted JS directly to Karma.
|
|
|
|
|
You don't precompile the TypeScript; Webpack transpiles the Typescript files on the fly, in memory, and feeds the emitted JS directly to Karma.
|
|
|
|
|
There are no temporary files on disk.
|
|
|
|
|
|
|
|
|
|
The `karma-test-shim` tells Karma what files to pre-load and
|
|
|
|
|
@ -383,23 +425,23 @@ a(id="test-configuration")
|
|
|
|
|
+makeExample('webpack/ts/config/karma-test-shim.js', null, 'config/karma-test-shim.js')(format=".")
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Notice that we do _not_ load our application code explicitly.
|
|
|
|
|
We tell Webpack to find and load our test files (the files ending in `.spec.ts`).
|
|
|
|
|
Notice that you do _not_ load the application code explicitly.
|
|
|
|
|
You tell Webpack to find and load the test files (the files ending in `.spec.ts`).
|
|
|
|
|
Each spec file imports all — and only — the application source code that it tests.
|
|
|
|
|
Webpack loads just _those_ specific application files and ignores the other files that we aren't testing.
|
|
|
|
|
Webpack loads just _those_ specific application files and ignores the other files that you aren't testing.
|
|
|
|
|
|
|
|
|
|
:marked
|
|
|
|
|
Grab the app code at the end of this guide and try:
|
|
|
|
|
|
|
|
|
|
code-example(format="").
|
|
|
|
|
code-example(language="sh" class="code-shell").
|
|
|
|
|
npm test
|
|
|
|
|
|
|
|
|
|
<a id="try"></a>
|
|
|
|
|
:marked
|
|
|
|
|
## Trying it out
|
|
|
|
|
|
|
|
|
|
Here is the source code for a small application that we can bundle with the
|
|
|
|
|
Webpack techniques we learned in this chapter.
|
|
|
|
|
Here is the source code for a small application that bundles with the
|
|
|
|
|
Webpack techniques covered in this guide.
|
|
|
|
|
|
|
|
|
|
+makeTabs(
|
|
|
|
|
`webpack/ts/src/index.html,
|
|
|
|
|
@ -431,13 +473,15 @@ p.
|
|
|
|
|
<a href="https://raw.githubusercontent.com/angular/angular.io/master/public/resources/images/logos/angular2/angular.png" target="_blank">
|
|
|
|
|
<img src="/resources/images/logos/angular2/angular.png" height="40px" title="download Angular logo"></a>.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
a#bundle-ts
|
|
|
|
|
:marked
|
|
|
|
|
Here again are the TypeScript entry-point files that define the `polyfills` and `vendor` bundles.
|
|
|
|
|
+makeTabs(
|
|
|
|
|
`webpack/ts/src/vendor.ts,
|
|
|
|
|
webpack/ts/src/polyfills.ts`,
|
|
|
|
|
`webpack/ts/src/polyfills.ts,
|
|
|
|
|
webpack/ts/src/vendor.ts`,
|
|
|
|
|
null,
|
|
|
|
|
`src/vendor.ts,
|
|
|
|
|
src/polyfills.ts`
|
|
|
|
|
`src/polyfills.ts,
|
|
|
|
|
src/vendor.ts`
|
|
|
|
|
)
|
|
|
|
|
<a id="highlights"></a>
|
|
|
|
|
:marked
|
|
|
|
|
@ -450,7 +494,8 @@ p.
|
|
|
|
|
|
|
|
|
|
* The `AppComponent` itself has its own html template and css file. WebPack loads them with calls to `require()`.
|
|
|
|
|
Webpack stashes those component-scoped files in the `app.js` bundle too.
|
|
|
|
|
We don't see those calls in our source code; they're added behind the scenes by the `angular2-template-loader` plug-in.
|
|
|
|
|
You don't see those calls in the source code;
|
|
|
|
|
they're added behind the scenes by the `angular2-template-loader` plug-in.
|
|
|
|
|
|
|
|
|
|
* The `vendor.ts` consists of vendor dependency `import` statements that drive the `vendor.js` bundle.
|
|
|
|
|
The application imports these modules too; they'd be duplicated in the `app.js` bundle
|
|
|
|
|
@ -460,9 +505,9 @@ p.
|
|
|
|
|
:marked
|
|
|
|
|
## Conclusions
|
|
|
|
|
|
|
|
|
|
We've learned just enough Webpack to configurate development, test and production builds
|
|
|
|
|
You've learned just enough Webpack to configurate development, test and production builds
|
|
|
|
|
for a small Angular application.
|
|
|
|
|
|
|
|
|
|
_We could always do more_. Search the web for expert advice and expand your Webpack knowledge.
|
|
|
|
|
_You could always do more_. Search the web for expert advice and expand your Webpack knowledge.
|
|
|
|
|
|
|
|
|
|
[Back to top](#top)
|
|
|
|
|
|
Jesús Rodríguez
GitHub