@mlz/imagemin-webpack
v5.1.1
Published
Webpack loader and plugin to optimize (compress) images using imagemin
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Readme
imagemin-webpack
Why
No extra dependencies (
imagemin-gifsicle
,imagemin-pngquant
) independencies
section intopackage.json
. You decide for yourself what plugins to use.This loader and plugin will optimize ANY images regardless of how they were added to webpack.
image-webpack-loader
don't optimize some images generatingfavicons-webpack-plugin
orcopy-webpack-plugin
.ImageminWebpackPlugin
don't optimize inlined images withurl-loader
.Images optimized when inlined with
url-loader
orsvg-url-loader
. This can't be done withimagemin-webpack-plugin
.Throttle asynchronous images optimization (using
maxConcurrency
plugin option). This allows you to not overload a server when building.All tested.
Persistent cache.
(Optional) Don't crash building process if your have corrupted image(s).
Install
npm install imagemin-webpack --save-dev
Optionals
Images can be optimized in two modes:
Note:
- imagemin-mozjpeg can be configured in lossless and lossy mode.
- imagemin-svgo can be configured in lossless and lossy mode.
Explore the options to get the best result for you.
Recommended basic imagemin plugins for lossless optimization
npm install imagemin-gifsicle imagemin-jpegtran imagemin-optipng imagemin-svgo --save-dev
Recommended basic imagemin plugins for lossy optimization
npm install imagemin-gifsicle imagemin-mozjpeg imagemin-pngquant imagemin-svgo --save-dev
Basic
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
}
]
}
]
},
plugins: [
// Make sure that the plugin is after any plugins that add images, example `CopyWebpackPlugin`
new ImageminPlugin({
bail: false, // Ignore errors on corrupted images
cache: true,
imageminOptions: {
// Before using imagemin plugins make sure you have added them in `package.json` (`devDependencies`) and installed them
// Lossless optimization with custom option
// Feel free to experiment with options for better result for you
plugins: [
["gifsicle", { interlaced: true }],
["jpegtran", { progressive: true }],
["optipng", { optimizationLevel: 5 }],
[
"svgo",
{
plugins: [
{
removeViewBox: false
}
]
}
]
]
}
})
]
};
Note: If you want to use loader
or plugin
standalone see sections below, but this is not recommended.
Note: Make sure that plugin place after any plugins that add images or other assets which you want to optimized.
Standalone Loader
In your webpack.config.js
, add the ImageminPlugin.loader
,
chained with the file-loader
or url-loader:
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
},
{
loader: ImageminPlugin.loader,
options: {
bail: false, // Ignore errors on corrupted images
cache: true,
imageminOptions: {
plugins: ["gifsicle"]
}
}
}
]
}
]
}
};
Standalone Plugin
webpack.config.js
const ImageminWebpack = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
loader: "file-loader",
options: {
emitFile: true, // Don't forget emit images
name: "[path][name].[ext]"
},
test: /\.(jpe?g|png|gif|svg)$/i
}
]
},
plugins: [
// Make sure that the plugin placed after any plugins that added images
new ImageminWebpack({
bail: false, // Ignore errors on corrupted images
cache: true,
imageminOptions: {
plugins: ["gifsicle"]
},
// Disable `loader`
loader: false
})
]
};
Options
Plugin Options
| Name | Type | Default | Description |
| :-------------------: | :---------------------------------------: | :----------------------------------------: | :------------------------------------------------------------------------------------------------------------------------ |
| test
| {String\/RegExp\|Array<String\|RegExp>}
| /.(jpe?g|png|gif|svg)$/i | Test to match files against |
| include
| {String\/RegExp\|Array<String\|RegExp>}
| undefined
| Files to include
|
| exclude
| {String\/RegExp\|Array<String\|RegExp>}
| undefined
| Files to exclude
|
| filter
| {Function}
| () => true
| Allows filtering of images for optimization |
| cache
| {Boolean\|String}
| false
| Enable file caching |
| bail
| {Boolean}
| compiler.options.bail
| Emit warnings instead errors |
| imageminOptions
| {Object}
| { plugins: [] }
| Options for imagemin
|
| loader
| {Boolean}
| true
| Automatically adding imagemin-loader
(require for minification images using in url-loader
, svg-url-loader
or other) |
| maxConcurrency
| {Number}
| Math.max(1, os.cpus().length - 1)
| Maximum number of concurrency optimization processes in one time |
| name
| {String}
| [hash].[ext]
| The target asset name |
| manifest
| {Object}
| undefined
| Contain optimized list of images from other plugins |
test
Test to match files against.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
test: /\.(jpe?g|png|gif|svg)$/i
})
]
};
include
Files to include.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
include: /\/includes/
})
]
};
exclude
Files to exclude.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
exclude: /\/excludes/
})
]
};
filter
Allows filtering of images for optimization.
Return true
to optimize the image, false
otherwise.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
filter: (source, sourcePath) => {
// The `source` argument is a `Buffer` of source file
// The `sourcePath` argument is an absolute path to source
if (source.byteLength < 8192) {
return false;
}
return true;
}
})
]
};
cache
Enable/disable file caching. Default path to cache directory: node_modules/.cache/imagemin-webpack
.
Be careful: you should remove cache manually when you enable cache
using Function
configuration for imagemin plugins and change option(s) for plugin(s) (for example for imagemin-gifsicle
).
{Boolean}
Enable/disable file caching.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
cache: true
})
]
};
{String}
Enable file caching and set path to cache directory.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
cache: "path/to/cache"
})
]
};
bail
Emit warnings instead errors.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
bail: true
})
]
};
imageminOptions
Options for imagemin
.
More information and examples here.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
plugins: [
new ImageminPlugin({
imageminOptions: {
plugins: [
// Name
"gifsicle",
// Name with options
["mozjpeg", { quality: 80 }],
// Full package name
[
"imagemin-svgo",
{
plugins: [
{
removeViewBox: false
}
]
}
],
[
// Custom package name
"nonstandard-imagemin-package-name",
{ myOptions: true }
]
]
}
})
]
};
maxConcurrency
Maximum number of concurrency optimization processes in one time.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
maxConcurrency: 3
})
]
};
name
The target asset name.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
module.exports = {
plugins: [
new ImageminPlugin({
name: "[hash]-compressed.[ext]"
})
]
};
manifest
Contain optimized list of images from other plugins.
Note: contains only assets compressed by plugin.
Note: manifest will be contain list of optimized images only after emit
event.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const ManifestPlugin = require("manifest-webpack-plugin");
const manifest = {};
module.exports = {
plugins: [
new ImageminPlugin({
manifest
}),
new ManifestPlugin({
// Contain compressed images
manifest
})
]
};
Loader Options
| Name | Type | Default | Description |
| :-------------------: | :-----------------: | :---------------------: | :------------------------------------------ |
| filter
| {Function}
| undefined
| Allows filtering of images for optimization |
| cache
| {Boolean\|String}
| false
| Enable file caching |
| bail
| {Boolean}
| compiler.options.bail
| Emit warnings instead errors |
| imageminOptions
| {Object}
| { plugins: [] }
| Options for imagemin
|
filter
Allows filtering of images for optimization.
Return true
to optimize the image, false
otherwise.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
},
{
loader: ImageminPlugin.loader,
options: {
cache: true,
filter: (source, sourcePath) => {
// The `source` argument is a `Buffer` of source file
// The `sourcePath` argument is an absolute path to source
if (source.byteLength < 8192) {
return false;
}
return true;
},
imageminOptions: {
plugins: ["gifsicle"]
}
}
}
]
}
]
}
};
cache
Enable file caching. Default path to cache directory: node_modules/.cache/imagemin-webpack
.
{Boolean}
Enable/disable file caching.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
},
{
loader: ImageminPlugin.loader,
options: {
cache: true,
imageminOptions: {
plugins: ["gifsicle"]
}
}
}
]
}
]
}
};
{String}
Enable file caching and set path to cache directory.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
},
{
loader: ImageminPlugin.loader,
options: {
cache: "path/to/cache",
imageminOptions: {
plugins: ["gifsicle"]
}
}
}
]
}
]
}
};
bail
Emit warnings instead errors.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
},
{
loader: ImageminPlugin.loader,
options: {
bail: true,
imageminOptions: {
plugins: ["gifsicle"]
}
}
}
]
}
]
}
};
imageminOptions
Options for imagemin
.
More information and examples here.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminGifsicle = require("imagemin-gifsicle");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: "file-loader" // Or `url-loader` or your other loader
},
{
loader: ImageminPlugin.loader,
options: {
bail: true,
imageminOptions: {
plugins: [
["gifsicle", { interlaced: true, optimizationLevel: 3 }]
]
}
}
}
]
}
]
}
};
Examples
Optimize images based on size
You can use difference options (like progressive
/interlaced
and etc) based on image size (example - don't do progressive transformation for small images).
What is progressive
image? Answer here
.
webpack.config.js
const ImageminPlugin = require("imagemin-webpack");
const imageminJpegtran = require("imagemin-jpegtran");
module.exports = {
minimizer: [
new ImageminPlugin({
// Only apply this one to files equal to or over 8192 bytes
filter: source => {
if (source.byteLength >= 8192) {
return true;
}
return false;
},
imageminOptions: {
plugins: [["jpegtran", { progressive: true }]]
}
}),
new ImageminPlugin({
// Only apply this one to files under 8192
filter: source => {
if (source.byteLength < 8192) {
return true;
}
return false;
},
imageminOptions: {
plugins: [["jpegtran", { progressive: false }]]
}
})
]
};
Additional API
normalizeConfig(config)
The function normalizes configuration (converts plugins names and options to Function
s) for using in imagemin
package directly.
const imagemin = require("imagemin");
const { normalizeConfig } = require("imagemin-webpack");
const imageminConfig = normalizeConfig({
plugins: [
"jpegtran",
[
"pngquant",
{
quality: [0.6, 0.8]
}
]
]
});
/*
console.log(imageminConfig);
=>
{
plugins: [Function, Function],
pluginsMeta: [
{ name: "imagemin-jpegtran", version: "x.x.x", options: {} },
{ name: "imagemin-pngquant", version: "x.x.x", options: { quality: [0.6, 0.8] }
]
}
*/
(async () => {
const files = await imagemin(["images/*.{jpg,png}"], {
destination: "build/images",
plugins: imageminConfig.plugins
});
console.log(files);
// => [{data: <Buffer 89 50 4e …>, path: 'build/images/foo.jpg'}, …]
})();
Related
- imagemin - API for this package.
- image-webpack-loader - inspiration, thanks.
- imagemin-webpack-plugin - inspiration, thanks.
Contribution
Feel free to push your code if you agree with publishing under the MIT license.