gem-hunter

Creates a compressed .gz / .br artifact for your Rollup / Vite bundle.

COMPATIBILITY NOTE: This version is compatible with rollup >= 2.0.0

• For rollup >= 0.60 - 1.x, use version 2.x of this plugin
• For older versions of rollup, use version 1.x of this plugin

npm install --save-dev rollup-plugin-gzip

import { rollup } from 'rollup'
import gzipPlugin from 'rollup-plugin-gzip'

rollup({
  input: 'src/index.js',
  plugins: [gzipPlugin()],
}).then(/* ... */)

NOTE: This plugin is an ES module. If you import it using require(), you have to point to the default export via require('rollup-plugin-gzip').default

filter RegExp | (fileName: string) => boolean

Control which of the output files to compress.

Defaults to /\.(js|mjs|cjs|json|css|html|wasm|svg)$/

gzipOptions object

GZIP compression options, see https://nodejs.org/api/zlib.html#zlib_class_options

minSize number

Specified the minimum size in Bytes for a file to get compressed. Files that are smaller than this threshold will not be compressed. This does not apply to the files specified through additionalFiles!

additionalFiles string[]

This option allows you to compress additional files outside of the main rollup bundling process.

additionalFilesDelay number

This options sets a delay (ms) before the plugin compresses the files specified through additionalFiles.

Defaults to 0 for Rollup >= 2.0.0, 2000 for older versions of Rollup

customCompression (content: string | Buffer) => string | Buffer | Promise<string | Buffer>

Set a custom compression algorithm. The function can either return the compressed contents synchronously, or otherwise return a promise for asynchronous processing.

fileName string | (fileName: string) => string

Set a custom file name convention for the compressed files. Can be a suffix string or a function returning the file name.

Defaults to ".gz"

NOTE: These examples use Rollup's JavaScript API. For Rollup configuration file examples, check out the /examples directory.

Since Node 11.7.0 you can use Node's built-in Brotli compression:

import { brotliCompress } from 'zlib'
import { promisify } from 'util'
import { rollup } from 'rollup'
import gzipPlugin from 'rollup-plugin-gzip'

const brotliPromise = promisify(brotliCompress)

rollup({
  input: 'src/index.js',
  plugins: [
    gzipPlugin({
      customCompression: content => brotliPromise(Buffer.from(content)),
      fileName: '.br',
    }),
  ],
}).then(/* ... */)

For Node < 11.7.0 you need the external brotli module:

import { compress } from 'brotli'
import { rollup } from 'rollup'
import gzipPlugin from 'rollup-plugin-gzip'

rollup({
  input: 'src/index.js',
  plugins: [
    gzipPlugin({
      customCompression: content => compress(Buffer.from(content)),
      fileName: '.br',
    }),
  ],
}).then(/* ... */)

Zopfli support is available through several different external packages, each of which comes with advantages and disadvantages:

• node-zopfli (or node-zopfli-es) - native version, longer installation time, might require build tooling

import { gzipSync } from 'node-zopfli'
import { rollup } from 'rollup'
import gzipPlugin from 'rollup-plugin-gzip'

rollup({
  input: 'src/index.js',
  plugins: [
    gzipPlugin({
      customCompression: content => gzipSync(Buffer.from(content)),
    }),
  ],
}).then(/* ... */)

• @gfx/zopfli - WebAssembly version, faster installation, slower compression

import { gzipAsync } from '@gfx/zopfli'
import { rollup } from 'rollup'
import gzipPlugin from 'rollup-plugin-gzip'

rollup({
  input: 'src/index.js',
  plugins: [
    gzipPlugin({
      customCompression: content =>
        gzipAsync(Buffer.from(content), { numiterations: 15 }),
    }),
  ],
}).then(/* ... */)

To support compressing your bundle into multiple different formats, you can add this plugin multiple times with different configurations:

import { brotliCompress } from 'zlib'
import { promisify } from 'util'
import { rollup } from 'rollup'
import gzipPlugin from 'rollup-plugin-gzip'

const brotliPromise = promisify(brotliCompress)

rollup({
  input: 'src/index.js',
  plugins: [
    // GZIP compression as .gz files
    gzipPlugin(),
    // Brotil compression as .br files
    gzipPlugin({
      customCompression: content => brotliPromise(Buffer.from(content)),
      fileName: '.br',
    }),
  ],
}).then(/* ... */)

MIT