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# img-loader
[![npm Version][npm-image]][npm]
[![MIT License][license-image]][LICENSE]
Image minimizing loader for webpack 4, meant to be used with [url-loader](https://github.com/webpack/url-loader), [file-loader](https://github.com/webpack/file-loader), or [raw-loader](https://github.com/webpack/raw-loader)
> Minify PNG, JPEG, GIF and SVG images with [imagemin](https://github.com/imagemin/imagemin) [plugins](https://www.npmjs.com/search?q=keywords:imageminplugin)
img-loader has a peer dependency on `imagemin`, so you will need to make sure to include that, along with any imagemin plugins you will use.
## Install
```sh
$ npm install img-loader --save-dev
```
## Usage
[Documentation: Using loaders](https://webpack.js.org/concepts/loaders/)
```javascript
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
'url-loader?limit=10000',
'img-loader'
]
}
]
}
```
By default the loader simply passes along the image unmodified.
### Options
Options are forwarded to `imagemin.buffer(image, options)`, so any plugins you would like to use for optimizing the images are passed as the `plugins` property.
For more details on each plugin's options, see their documentation on [Github](https://github.com/imagemin).
```js
{
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
'url-loader?limit=10000',
{
loader: 'img-loader',
options: {
plugins: [
require('imagemin-gifsicle')({
interlaced: false
}),
require('imagemin-mozjpeg')({
progressive: true,
arithmetic: false
}),
require('imagemin-pngquant')({
floyd: 0.5,
speed: 2
}),
require('imagemin-svgo')({
plugins: [
{ removeTitle: true },
{ convertPathData: false }
]
})
]
}
}
]
}
]
}
}
```
`plugins` can also be a function, which will receive the [webpack loader context](https://webpack.js.org/api/loaders/#the-loader-context) and should return the plugins array.
```js
{
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
'url-loader?limit=10000',
{
loader: 'img-loader',
options: {
plugins (context) {
if (process.env.NODE_ENV === 'production') return []
return [
require('imagemin-svgo')({
plugins: [
{ cleanupIDs: false },
{
prefixIds: {
prefix: path.basename(context.resourcePath, 'svg')
}
}
]
})
]
}
}
}
]
}
]
}
}
```
If you only want to run imagemin in production builds, you can omit the `img-loader` or leave plugins empty in your production configuration file. If you don't keep a separate configuration for prod builds, something like the following also works:
```js
{
loader: 'img-loader',
options: {
plugins: process.env.NODE_ENV === 'production' && [
require('imagemin-svgo')({})
// etc.
]
}
}
```
## Migrating from 2.x
To get the default behavior from version `2.0.1`, you'll need to install these imagemin plugins:
* [imagemin-gifsicle](https://github.com/imagemin/imagemin-gifsicle)
* [imagemin-mozjpeg](https://github.com/imagemin/imagemin-mozjpeg)
* [imagemin-optipng](https://github.com/imagemin/imagemin-optipng)
* [imagemin-svgo](https://github.com/imagemin/imagemin-svgo)
Then use this loader setup in your webpack configuration file:
```js
{
loader: 'img-loader',
options: {
plugins: [
require('imagemin-gifsicle')({}),
require('imagemin-mozjpeg')({}),
require('imagemin-optipng')({}),
require('imagemin-svgo')({})
]
}
}
```
The options object you had under a plugin's name property, should instead be passed directly to the plugin after you require it.
If you used the optional `pngquant` settings, then you will additionally need to install [imagemin-pngquant](https://github.com/imagemin/imagemin-pngquant), and add it to your plugins array as any other imagemin plugin.
## License
This software is free to use under the MIT license. See the [LICENSE-MIT file][LICENSE] for license text and copyright information.
[npm]: https://www.npmjs.org/package/img-loader
[npm-image]: https://img.shields.io/npm/v/img-loader.svg
[license-image]: https://img.shields.io/npm/l/img-loader.svg
[LICENSE]: https://github.com/vanwagonet/img-loader/blob/master/LICENSE-MIT