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<!doctype html>
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Webpack 2: image - My Frontend Note
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<h1>Webpack 2: image</h1>
<div class="read-more clearfix">
<span class="date">2017/6/7</span>
<span>posted in </span>
<span class="posted-in"><a href='Webpack.html'>Webpack</a></span>
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<ul>
<li>
<a href="#toc_0">loaders</a>
</li>
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<a href="#toc_1">config</a>
</li>
</ul>
<h2 id="toc_0">loaders</h2>
<p><code>image-webpack-loader</code></p>
<p>compress the images</p>
<p><code>url-loader</code></p>
<p>depend on the size of image (file size such as 10kb)<br/>
decide how to import:</p>
<ol>
<li>small than limit: dev image -> base64 string in <code>bundle.js</code></li>
<li>large than limit: dev image -> copy to output folder</li>
</ol>
<p><img src="media/14968407714208/2017-06-07-01.png" alt="images-webpack"/></p>
<h2 id="toc_1">config</h2>
<p><code>webpack.config</code></p>
<pre><code class="language-javascript">const config = {
module: {
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js',
},
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/,
use: [
{
loader: 'url-loader',
options: { limit: 40000 } // 40000bytes
},
'image-webpack-loader'
]
]
}
}
</code></pre>
<p><code>image_viewer.js</code></p>
<pre><code class="language-js">import big from '../assets/big.jpg'; // big <- path string
import small from '../assets/small.jpg'; // small <- base64 string
const smallImage = document.createElement('img');
smallImage.src = small
const bigImage = document.createElement('img');
smallImage.src = big // wrong path to js modules directory if not set publicPath
</code></pre>
<p><code>./assets/big.jpg</code> -> <code>./bulid/j3r0j3rj0rjr.jpg</code><br/>
<code>./assets/small.jpg</code>r -> base64 string in <code>./build/bundle.js</code></p>
<span id="more"></span><!-- more -->
<p><strong>Don't forget to set <code>publicPath</code>:</strong></p>
<pre><code class="language-javascript">const config = {
module: {
entry: './src/index.js',
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js',
publicPath: 'build/' // url-loader will prepend the string to the filename of imported image then pass it to import statement
},
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/,
use: [
{
loader: 'url-loader',
options: { limit: 40000 } // 40000bytes
},
'image-webpack-loader'
]
}
]
}
}
</code></pre>
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