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<!doctype html>
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<head>
<meta charset="utf-8" />
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<title>
Webpack 2: Intro - My Frontend Note
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<div class="article">
<h1>Webpack 2: Intro</h1>
<div class="read-more clearfix">
<span class="date">2017/6/4</span>
<span>posted in </span>
<span class="posted-in"><a href='Webpack.html'>Webpack</a></span>
<span class="comments">
</span>
</div>
</div><!-- article -->
<div class="article-content">
<ul>
<li>
<a href="#toc_0">Webpack install and config</a>
<ul>
<li>
<a href="#toc_1">config</a>
</li>
<li>
<a href="#toc_2">install</a>
</li>
<li>
<a href="#toc_3">Why bundle.js fat?</a>
</li>
<li>
<a href="#toc_4">index.html</a>
</li>
</ul>
</li>
<li>
<a href="#toc_5">module loaders</a>
<ul>
<li>
<a href="#toc_6">babel</a>
</li>
<li>
<a href="#toc_7">loders config</a>
</li>
</ul>
</li>
</ul>
<span id="more"></span><!-- more -->
<h2 id="toc_0">Webpack install and config</h2>
<h3 id="toc_1">config</h3>
<p><code>webpack.config.js</code></p>
<pre><code class="language-js">const path = require('path'); // helper from NodeJS
const config = {
entry: './src/index.js', // relative path
output: {
path: path.resolve(__dirname, 'build'); // absolute path '$PWD/bulid'
filename: 'bundle.js'
}
};
module.exports = config;
</code></pre>
<h3 id="toc_2">install</h3>
<p>Install locally:</p>
<pre><code class="language-bash">npm install webpack --save-dev
</code></pre>
<p>Run webpack in <code>node_modules</code> for certain project:</p>
<p><code>package.json</code></p>
<pre><code class="language-json">{
"script": {
"build": "webpack"
}
}
</code></pre>
<h3 id="toc_3">Why bundle.js fat?</h3>
<p>運作原理見 bookmark </p>
<h3 id="toc_4">index.html</h3>
<p>single page app only need single html file</p>
<h2 id="toc_5">module loaders</h2>
<p>pre processing on file before they are added to bundle.js</p>
<h3 id="toc_6">babel</h3>
<p><code>babel-loder</code> A compatibility layer tells babel how to work with build systems(such as webpack)</p>
<p><code>babel-core</code> core</p>
<p><code>babel-preset-env</code> Libraries(recipes) tell <code>bable-core</code> transform codes in some fashions.</p>
<h3 id="toc_7">loders config</h3>
<p><code>package.json</code></p>
<pre><code class="language-js">const path = require('path');
const config = {
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js'
},
module: {
rules: [
{
use: 'babel-loader',
test: \/.js$/
}
]
}
};
module.exports = config;
</code></pre>
<p><code>.babelrc</code></p>
<pre><code class="language-js">{
"presets": ["babe-preset-env"]
}
</code></pre>
<p>fake img src:<br/>
<a href="http://lorempixel.com/400/400">http://lorempixel.com/400/400</a></p>
<p>note:</p>
<pre><code class="language-js">import './image_view'; // execute codes in `image_view.js` directly
</code></pre>
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