image-minimizer-webpack-plugin
Advanced tools
Webpack loader and plugin to optimize (compress) images using imagemin
Plugin and Loader for webpack to optimize (compress) all images using imagemin. Do not worry about size of images, now they are always optimized/compressed.
This plugin can use 4 tools to optimize/generate images:
imagemin - optimize your images by default, since it is stable and works with all types of imagessquoosh - while working in experimental mode with .jpg, .jpeg, .png, .webp, .avif file types.sharp - High performance Node.js image processing, the fastest module to resize and compress JPEG, PNG, WebP, AVIF and TIFF images. Uses the libvips library.svgo - tool for optimizing SVG vector graphics files. Supports only SVG files minification.Warning
By default we don't install anything
To begin, you'll need to install image-minimizer-webpack-plugin and image minimizer/generator:
npm install image-minimizer-webpack-plugin imagemin --save-dev
Warning
imagemin uses plugin to optimize/generate images, so you need to install them too
npm install image-minimizer-webpack-plugin @squoosh/lib --save-dev
npm install image-minimizer-webpack-plugin sharp --save-dev
svgo:npm install image-minimizer-webpack-plugin svgo --save-dev
Images can be optimized in two modes:
imageminNote
- 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 imagemin plugins for lossless optimization
npm install imagemin-gifsicle imagemin-jpegtran imagemin-optipng imagemin-svgo --save-dev
Recommended imagemin plugins for lossy optimization
npm install imagemin-gifsicle imagemin-mozjpeg imagemin-pngquant imagemin-svgo --save-dev
For imagemin-svgo v9.0.0+ need use svgo configuration
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
// Lossless optimization with custom option
// Feel free to experiment with options for better result for you
plugins: [
["gifsicle", { interlaced: true }],
["jpegtran", { progressive: true }],
["optipng", { optimizationLevel: 5 }],
// Svgo configuration here https://github.com/svg/svgo#configuration
[
"svgo",
{
plugins: [
{
name: "preset-default",
params: {
overrides: {
removeViewBox: false,
addAttributesToSVGElement: {
params: {
attributes: [
{ xmlns: "http://www.w3.org/2000/svg" },
],
},
},
},
},
},
],
},
],
],
},
},
}),
],
},
};
squooshnpm install @squoosh/lib --save-dev
Recommended @squoosh/lib options for lossy optimization
For lossy optimization we recommend using the default settings of @squoosh/lib package.
The default values and supported file types for each option can be found in the codecs.ts file under codecs.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(jpe?g|png)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
options: {
// Your options for `squoosh`
},
},
}),
],
},
};
Recommended squoosh options for lossless optimization
For lossless optimization we recommend using the options listed below in minimizer.options.encodeOptions.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(jpe?g|png)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
options: {
encodeOptions: {
mozjpeg: {
// That setting might be close to lossless, but it’s not guaranteed
// https://github.com/GoogleChromeLabs/squoosh/issues/85
quality: 100,
},
webp: {
lossless: 1,
},
avif: {
// https://github.com/GoogleChromeLabs/squoosh/blob/dev/codecs/avif/enc/README.md
cqLevel: 0,
},
},
},
},
}),
],
},
};
sharpnpm install sharp --save-dev
Recommended sharp options for lossy optimization
For lossy optimization we recommend using the default settings of sharp package.
The default values and supported file types for each option can be found in the sharp documentation.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(jpe?g|png)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.sharpMinify,
options: {
encodeOptions: {
// Your options for `sharp`
// https://sharp.pixelplumbing.com/api-output
},
},
},
}),
],
},
};
Recommended sharp options for lossless optimization
For lossless optimization we recommend using the options listed below in minimizer.options.encodeOptions.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(jpe?g|png)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
options: {
encodeOptions: {
jpeg: {
// https://sharp.pixelplumbing.com/api-output#jpeg
quality: 100,
},
webp: {
// https://sharp.pixelplumbing.com/api-output#webp
lossless: true,
},
avif: {
// https://sharp.pixelplumbing.com/api-output#avif
lossless: true,
},
// png by default sets the quality to 100%, which is same as lossless
// https://sharp.pixelplumbing.com/api-output#png
png: {},
// gif does not support lossless compression at all
// https://sharp.pixelplumbing.com/api-output#gif
gif: {},
},
},
},
}),
],
},
};
svgonpm install svgo --save-dev
Recommended svgo options for optimization
For optimization we recommend using the options listed below in minimizer.options.encodeOptions.
The default values for plugins can be found in the svgo plugins source code.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(svg)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.svgoMinify,
options: {
encodeOptions: {
// Pass over SVGs multiple times to ensure all optimizations are applied. False by default
multipass: true,
plugins: [
// set of built-in plugins enabled by default
// see: https://github.com/svg/svgo#default-preset
"preset-default",
],
},
},
},
}),
],
},
};
If you want to use loader or plugin standalone see sections below, but this is not recommended.
By default, plugin configures loader (please use the loader option if you want to disable this behaviour), therefore you should not setup standalone loader when you use a plugin setup.
Loader optimizes or generates images using options, so inlined images via data URI (i.e. data:) will be optimized or generated too, not inlined images will be optimized too.
squoosh and sharp currently)The plugin supports the following query parameters:
width/w - allows you to set the image widthheight/h - allows you to set the image heightas - to specify the preset optionExamples:
const myImage1 = new URL("image.png?width=150&height=120", import.meta.url);
const myImage2 = new URL("image.png?w=150&h=120", import.meta.url);
// You can omit one of the parameters to auto-scale
const myImage3 = new URL("image.png?w=150", import.meta.url);
// It works with the `preset` query parameter
const myImage4 = new URL("image.png?as=webp&w=150&h=120", import.meta.url);
// You can use `auto` to reset `width` or `height` from the `preset` option
const myImage5 = new URL("image.png?as=webp&w=150&h=auto", import.meta.url);
.class {
background: url("./image.png?width=150&height=120");
}
<picture>
<source srcset="photo.jpg?as=avif&width=150&height=120" type="image/avif" />
<source srcset="photo.jpg?as=webp&width=150&height=120" type="image/webp" />
<img src="photo.jpg?width=150&height=120" alt="photo" />
</picture>
NOTE: you need to setup avif and webp presets, example for webp
In your webpack.config.js, add the ImageMinimizerPlugin.loader and specify the asset modules options (if you use images in import):
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(jpe?g|png|gif|svg)$/i,
type: "asset",
},
// We recommend using only for the "production" mode
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: ImageMinimizerPlugin.loader,
enforce: "pre",
options: {
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
},
},
],
},
],
},
};
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
// You need this, if you are using `import file from "file.ext"`, for `new URL(...)` syntax you don't need it
{
test: /\.(jpe?g|png|gif|svg)$/i,
type: "asset",
},
],
},
optimization: {
minimizer: [
// Extend default minimizer, i.e. `terser-webpack-plugin` for JS
"...",
// We recommend using only for the "production" mode
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
// Disable `loader`
loader: false,
}),
],
},
};
testType:
type test = string | RegExp | Array<string | RegExp>;
Default: /\.(jpe?g\|png\|gif\|tif\|webp\|svg\|avif)\$/i
Test to match files against.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
test: /\.(jpe?g|png|gif|svg)$/i,
}),
],
},
};
includeType:
type include = string | RegExp | Array<string | RegExp>;
Default: undefined
Files to include.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
include: /\/includes/,
}),
],
},
};
excludeType:
type exclude = string | RegExp | Array<string | RegExp>;
Default: undefined
Files to exclude.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
exclude: /\/excludes/,
}),
],
},
};
minimizerType:
type minimizer =
| {
implementation: (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?:
| {
[key: string]: any;
}
| undefined
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
options?:
| {
[key: string]: any;
}
| undefined;
filter?: (source: Buffer, sourcePath: string) => boolean | undefined;
filename?:
| string
| ((
pathData: {
filename?: string | undefined;
},
assetInfo?: import("webpack").AssetInfo | undefined
) => string)
| undefined;
}
| Array<{
implementation: (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?:
| {
[key: string]: any;
}
| undefined
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
options?:
| {
[key: string]: any;
}
| undefined;
filter?: (source: Buffer, sourcePath: string) => boolean | undefined;
filename?:
| string
| ((
pathData: {
filename?: string | undefined;
},
assetInfo?: import("webpack").AssetInfo | undefined
) => string)
| undefined;
}>;
Default: undefined
Allows to setup default minify function.
ImageMinimizerPlugin.imageminMinifyImageMinimizerPlugin.squooshMinifyImageMinimizerPlugin.sharpMinifyImageMinimizerPlugin.svgoMinifyimageminwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
// Implementation
implementation: ImageMinimizerPlugin.imageminMinify,
// Options
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
}),
],
},
};
More information and examples here.
squooshwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
// Implementation
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
}),
],
},
};
More information and examples here.
sharpwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
// Implementation
implementation: ImageMinimizerPlugin.sharpMinify,
// Options
options: {
encodeOptions: {
jpeg: {
quality: 90,
},
},
},
},
}),
],
},
};
More information and examples here.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: async (original, options) => {
const inputExt = path.extname(original.filename).toLowerCase();
if (inputExt !== ".xxx") {
// Return `null` if the implementation does not support this file type
return null;
}
let result;
try {
result = await minifyAndReturnBuffer(original.data);
} catch (error) {
// Store error and return `null` if there was an error
original.errors.push(error);
return null;
}
return {
filename: original.filename,
data: result,
warnings: [...original.warnings],
errors: [...original.errors],
info: {
...original.info,
// Please always set it to prevent double minification
minimized: true,
// Optional
minimizedBy: ["custom-name-of-minimication"],
},
};
},
options: {
// Custom options
},
},
}),
],
},
};
Allows to setup multiple minimizers.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: [
{
// `sharp` will handle all bitmap formats (JPG, PNG, GIF, ...)
implementation: ImageMinimizerPlugin.sharpMinify,
// exclude SVG if implementation support it. Not required for `sharp`.
// filter: (source, sourcePath) => !(/\.(svg)$/i.test(sourcePath)),
options: {
encodeOptions: {
// Your options for `sharp`
// https://sharp.pixelplumbing.com/api-output
},
},
},
{
// `svgo` will handle vector images (SVG)
implementation: ImageMinimizerPlugin.svgoMinify,
options: {
encodeOptions: {
// Pass over SVGs multiple times to ensure all optimizations are applied. False by default
multipass: true,
plugins: [
// set of built-in plugins enabled by default
// see: https://github.com/svg/svgo#default-preset
"preset-default",
],
},
},
},
],
}),
],
},
};
implementationType:
type implementation = (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?: BasicTransformerOptions<T>
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
Default: undefined
Configure the default implementation.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
// Implementation
implementation: ImageMinimizerPlugin.squooshMinify,
},
}),
],
},
};
optionsType:
type options = {
[key: string]: any;
};
Default: undefined
Options for the implementation option (i.e. options for imagemin/squoosh/sharp/custom implementation).
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
}),
],
},
};
filterType:
type filter = (source: Buffer, sourcePath: string) => boolean | undefined;
Default: () => true
Allows filtering of images for optimization/generation.
Return true to optimize the image, false otherwise.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
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;
},
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
}),
],
},
};
filenameType:
type filename =
| string
| ((
pathData: {
filename?: string | undefined;
},
assetInfo?: import("webpack").AssetInfo | undefined
) => string)
| undefined;
Default: undefined
Allows to set the filename.
Supported values see in webpack template strings, File-level section.
We also support [width] and [height] placeholders (only sharp and squoosh).
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
filename: "optimized-[name][ext]",
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
}),
],
},
};
Example function usage:
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
filename: () => "optimized-[name][ext]",
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
}),
],
},
};
generatorType:
type generator = Array<{
implementation: (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?:
| {
[key: string]: any;
}
| undefined
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
options?:
| {
[key: string]: any;
}
| undefined;
filter?: (source: Buffer, sourcePath: string) => boolean | undefined;
filename?:
| string
| ((
pathData: {
filename?: string | undefined;
},
assetInfo?: import("webpack").AssetInfo | undefined
) => string)
| undefined;
preset?: string | undefined;
type?: "import" | "asset" | undefined;
}>;
Default: undefined
Allow to setup default generators.
Useful if you need generate webp/avif/etc from other formats.
Warning
If no generator was found for the image (i.e. no
?as=webpwas found in query params), theminimizeroption will be used. Therefore, it is recommended to configure generator outputs optimized image.
Warning
The option will not work if you disable
loader(i.e. set theloaderoption tofalse).
ImageMinimizerPlugin.imageminGenerateImageMinimizerPlugin.squooshGenerateImageMinimizerPlugin.sharpGenerateimageminExample webp generator:
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.imageminGenerate,
options: {
// Please specify only one plugin here, multiple plugins will not work
plugins: ["imagemin-webp"],
},
},
],
}),
],
},
};
squooshwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.squooshGenerate,
options: {
encodeOptions: {
// Please specify only one codec here, multiple codecs will not work
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
};
sharpwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.sharpGenerate,
options: {
encodeOptions: {
// Please specify only one codec here, multiple codecs will not work
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
};
Now you can generate the new image using:
// Old approach for getting URL
import webp from "./file.jpg?as=webp";
// Assets modules
console.log(new URL("./file.jpg?as=webp"));
div {
background: url("./file.jpg?as=webp");
}
You can use ?as=webp in any type of files.
Example multiple generators:
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.squooshGenerate,
options: {
encodeOptions: {
webp: {
quality: 90,
},
},
},
},
{
// You can apply generator using `?as=avif`, you can use any name and provide more options
preset: "avif",
implementation: ImageMinimizerPlugin.squooshGenerate,
options: {
encodeOptions: {
avif: {
cqLevel: 33,
},
},
},
},
],
}),
],
},
};
squoosh and sharp generator supports more options, for example you can resize an image:
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
// You can apply generator using `?as=webp-100-50`, you can use any name and provide more options
preset: "webp-100-50",
// implementation: ImageMinimizerPlugin.sharpGenerate,
implementation: ImageMinimizerPlugin.squooshGenerate,
options: {
resize: {
enabled: true,
width: 100,
height: 50,
},
encodeOptions: {
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
};
You can find more information here.
You can use your own generator implementation.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: async (original, options) => {
const inputExt = path.extname(original.filename).toLowerCase();
if (inputExt !== ".xxx") {
// Store error and return `null` if the implementation does not support this file type
original.errors.push(error);
return null;
}
let result;
try {
result = await minifyAndReturnBuffer(original.data);
} catch (error) {
// Store error and return `null` if there was an error
original.errors.push(error);
return null;
}
return {
filename: original.filename,
data: result,
warnings: [...original.warnings],
errors: [...original.errors],
info: {
...original.info,
// Please always set it to prevent double minification
generated: true,
// Optional
generatedBy: ["custom-name-of-minification"],
},
};
},
options: {
// Your options
},
},
],
}),
],
},
};
typeType:
type type = "import" | "asset" | undefined;
Default: "import"
Allows you to apply the generator for import or assets from compilation (useful for copied assets).
By default, generators are applying on import/require, but sometimes you need to generate new images from other plugins (for example - copy-webpack-plugin), if you need this, please set asset value for the type option.
webpack.config.js
const CopyPlugin = require("copy-webpack-plugin");
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
generator: [
{
// Apply generator for copied assets
type: "asset",
// You can use `ImageMinimizerPlugin.squooshGenerate`
// You can use `ImageMinimizerPlugin.sharpGenerate`
implementation: ImageMinimizerPlugin.imageminGenerate,
options: {
plugins: ["imagemin-webp"],
},
},
],
}),
],
},
plugins: [new CopyPlugin({ patterns: ["images/**/*.png"] })],
};
presetType:
type preset = string | undefined;
Default: undefined
Configure the name of preset, i.e. you can use it in ?as=name.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
preset: "name",
// Implementation
implementation: ImageMinimizerPlugin.squooshMinify,
},
],
}),
],
},
};
implementationType:
type implementation = (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?:
| {
[key: string]: any;
}
| undefined
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
Default: undefined
Configure the default implementation.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
preset: "name",
// Implementation
implementation: ImageMinimizerPlugin.squooshMinify,
},
],
}),
],
},
};
optionsType:
type options = {
[key: string]: any;
};
Default: undefined
Options for the implementation option (i.e. options for imagemin/squoosh/sharp/custom implementation).
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
preset: "name",
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
],
}),
],
},
};
filterType:
type filter = (source: Buffer, sourcePath: string) => boolean;
Default: () => true
Allows filtering of images for optimization/generation.
Return true to optimize the image, false otherwise.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
preset: "name",
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;
},
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
],
}),
],
},
};
filenameType:
type filename =
| string
| ((
pathData: PathData,
assetInfo?: import("webpack").AssetInfo | undefined
) => string);
Default: undefined
Allows to set the filename.
Supported values see in webpack template strings, File-level section.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
preset: "name",
filename: "generated-[name][ext]",
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
],
}),
],
},
};
Example of function usage:
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
generator: [
{
preset: "name",
filename: () => "generated-[name][ext]",
implementation: ImageMinimizerPlugin.squooshMinify,
// Options
options: {
encodeOptions: {
mozjpeg: {
quality: 90,
},
},
},
},
],
}),
],
},
};
severityErrorType:
type severityError = string;
Default: 'error'
Allows to choose how errors are displayed.
Сan have the following values:
'off' - suppresses errors and warnings'warning' - emit warnings instead errors'error' - emit errorswebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
severityError: "warning",
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
}),
],
},
};
loaderType:
type loader = boolean;
Default: true
Automatically adding built-in loader, used to optimize/generate images.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
loader: false,
// `generator` will not work in this case
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
}),
],
},
};
concurrencyType:
type concurrency = number;
Default: Math.max(1, os.cpus().length - 1)
Maximum number of concurrency optimization processes in one time.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
concurrency: 3,
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
}),
],
},
};
deleteOriginalAssetsType:
type deleteOriginalAssets = boolean;
Default: true
Allows removing original assets after optimization.
Please use this option if you are set the filename option for the minimizer option, disable loader: false and want to keep optimized and not optimized assets.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
// Disable loader
loader: false,
// Allows to keep original asset and minimized assets with different filenames
deleteOriginalAssets: false,
minimizer: {
filename: "[path][name].webp",
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
}),
],
},
};
minimizerType:
type minimizer =
| {
implementation: (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?:
| {
[key: string]: any;
}
| undefined
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
options?:
| {
[key: string]: any;
}
| undefined;
filter?: (source: Buffer, sourcePath: string) => boolean | undefined;
filename?:
| string
| ((
pathData: {
filename?: string | undefined;
},
assetInfo?: import("webpack").AssetInfo | undefined
) => string)
| undefined;
}
| Array<{
implementation: (
original: {
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
},
options?:
| {
[key: string]: any;
}
| undefined
) => Promise<{
filename: string;
data: Buffer;
warnings: Array<Error>;
errors: Array<Error>;
info: import("webpack").AssetInfo;
}> & {
setup?: (() => void) | undefined;
teardown?: (() => void) | undefined;
};
options?:
| {
[key: string]: any;
}
| undefined;
filter?: (source: Buffer, sourcePath: string) => boolean | undefined;
filename?:
| string
| ((
pathData: {
filename?: string | undefined;
},
assetInfo?: import("webpack").AssetInfo | undefined
) => string)
| undefined;
}>;
Default: undefined
Allows to setup default minimizer.
imageminwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
type: "asset",
},
{
test: /\.(jpe?g|png|gif|svg)$/i,
loader: ImageMinimizerPlugin.loader,
enforce: "pre",
options: {
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
options: {
// Your options
},
},
},
},
],
},
};
For more information and supported options please read here.
generatorType:
type generator = Array<{
implementation: TransformerFunction<T>;
options?: BasicTransformerOptions<T>;
filter?: FilterFn | undefined;
filename?: string | FilenameFn | undefined;
preset?: string | undefined;
type?: "import" | "asset" | undefined;
}>;
Default: undefined
Allow to setup default generators.
Useful if you need generate webp/avif/etc from other formats.
imageminwebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
type: "asset",
},
{
test: /\.(jpe?g|png|gif|svg)$/i,
loader: ImageMinimizerPlugin.loader,
enforce: "pre",
options: {
generator: [
{
preset: "webp",
implementation: ImageMinimizerPlugin.imageminGenerate,
options: {
plugins: ["imagemin-webp"],
},
},
],
},
},
],
},
};
For more information and supported options please read here.
severityErrorType:
type severityError = string;
Default: 'error'
Allows to choose how errors are displayed.
Сan have the following values:
'off' - suppresses errors and warnings'warning' - emit warnings instead errors'error' - emit errorswebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
module: {
rules: [
{
test: /\.(jpe?g|png|gif|svg)$/i,
type: "asset",
},
{
test: /\.(jpe?g|png|gif|svg)$/i,
use: [
{
loader: ImageMinimizerPlugin.loader,
options: {
severityError: "warning",
minimizerOptions: {
plugins: ["gifsicle"],
},
},
},
],
},
],
},
};
imageminNormalizeConfig(config)The function normalizes configuration (converts plugins names and options to Functions) for using in imagemin package directly.
const imagemin = require("imagemin");
const { imageminNormalizeConfig } = require("image-minimizer-webpack-plugin");
/*
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 imageminConfig = await imageminNormalizeConfig({
plugins: ["jpegtran", ["pngquant", { quality: [0.6, 0.8] }]],
});
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'}, …]
})();
You can use difference options (like progressive/interlaced/etc.) based on image size (example - don't do progressive transformation for small images).
What is progressive image? Answer here.
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [["jpegtran", { progressive: true }]],
},
// Only apply this one to files equal to or over 8192 bytes
filter: (source) => {
if (source.byteLength >= 8192) {
return true;
}
return false;
},
},
}),
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [["jpegtran", { progressive: false }]],
},
// Only apply this one to files under 8192
filter: (source) => {
if (source.byteLength < 8192) {
return true;
}
return false;
},
},
}),
],
},
};
webp imageswebpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.imageminGenerate,
options: {
plugins: ["imagemin-webp"],
},
},
],
}),
],
},
};
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
},
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.squooshGenerate,
options: {
encodeOptions: {
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
};
webpack.config.js
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.sharpMinify,
},
generator: [
{
// You can apply generator using `?as=webp`, you can use any name and provide more options
preset: "webp",
implementation: ImageMinimizerPlugin.sharpGenerate,
options: {
encodeOptions: {
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
};
webp images from copied assetswebpack.config.js
const CopyPlugin = require("copy-webpack-plugin");
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.imageminMinify,
options: {
plugins: [
"imagemin-gifsicle",
"imagemin-mozjpeg",
"imagemin-pngquant",
"imagemin-svgo",
],
},
},
generator: [
{
type: "asset",
implementation: ImageMinimizerPlugin.imageminGenerate,
options: {
plugins: ["imagemin-webp"],
},
},
],
}),
],
},
plugins: [new CopyPlugin({ patterns: ["images/**/*.png"] })],
};
webpack.config.js
const CopyPlugin = require("copy-webpack-plugin");
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.squooshMinify,
},
generator: [
{
type: "asset",
implementation: ImageMinimizerPlugin.squooshGenerate,
options: {
encodeOptions: {
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
plugins: [new CopyPlugin({ patterns: ["images/**/*.png"] })],
};
webpack.config.js
const CopyPlugin = require("copy-webpack-plugin");
const ImageMinimizerPlugin = require("image-minimizer-webpack-plugin");
module.exports = {
optimization: {
minimizer: [
"...",
new ImageMinimizerPlugin({
minimizer: {
implementation: ImageMinimizerPlugin.sharpMinify,
},
generator: [
{
type: "asset",
implementation: ImageMinimizerPlugin.sharpGenerate,
options: {
encodeOptions: {
webp: {
quality: 90,
},
},
},
},
],
}),
],
},
plugins: [new CopyPlugin({ patterns: ["images/**/*.png"] })],
};
Please take a moment to read our contributing guidelines if you haven't yet done so.
FAQs
Webpack loader and plugin to optimize (compress) images using imagemin
The npm package image-minimizer-webpack-plugin receives a total of 74,460 weekly downloads. As such, image-minimizer-webpack-plugin popularity was classified as popular.
We found that image-minimizer-webpack-plugin demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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