Registry / devops / terser-webpack-plugin-legacy

terser-webpack-plugin-legacy

library1.2.5jsnpmunverified

Terser plugin for webpack 3.x to minify JavaScript using terser. Legacy version (v1.2.5) for webpack 3, maintained separately from the main terser-webpack-plugin which targets webpack 4+. Uses terser for modern ES6+ syntax support compared to uglify-js. Limited to Node >= 6.9.0 and webpack ^3.0.0. Not recommended for new projects; use terser-webpack-plugin (non-legacy) for webpack 4+.

devops

npm install terser-webpack-plugin-legacy

github ↗package ↗

INSTALL

IMPORT

SIG · TERSER-WEBPACK-PLU

terser-webpack-plugin-legacy

devopsjavascriptv1.2.5

Install

—

Import

—

Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

TerserPlugin

✓ const TerserPlugin = require('terser-webpack-plugin-legacy');

✗ import TerserPlugin from 'terser-webpack-plugin-legacy';

CJS only; no default ESM export in this legacy version.

TerserPlugin (as named export)

✓ const { TerserPlugin } = require('terser-webpack-plugin-legacy');

✗ const { TerserPlugin } = require('terser-webpack-plugin');

Note: package name is terser-webpack-plugin-legacy, not terser-webpack-plugin. Also, it's a default export, not named.

Plugin options

✓ new (require('terser-webpack-plugin-legacy'))({ cache: true })

✗ new (require('terser-webpack-plugin'))({ cache: true })

Common mistake: using wrong package name. Ensure version 1.x for webpack 3.

Sets up terser-webpack-plugin-legacy in webpack 3 config with cache enabled and console removal.

const TerserPlugin = require('terser-webpack-plugin-legacy'); module.exports = { context: __dirname, entry: './src/index.js', output: { path: __dirname + '/dist', filename: 'bundle.js' }, optimization: { minimizer: [ new TerserPlugin({ test: /\.js(\?.*)?$/i, cache: true, terserOptions: { compress: { drop_console: true } } }) ] } };

Debug

Known issues

gotchaPackage name is `terser-webpack-plugin-legacy`, not `terser-webpack-plugin`. Using the wrong package will install the modern version for webpack 4+.

fix

Install `terser-webpack-plugin-legacy` and require it as shown.

affects: >=1.0.0

breakingOnly compatible with webpack ^3.0.0. Will not work with webpack 4+.

fix

Upgrade to `terser-webpack-plugin` (non-legacy) for webpack 4+.

affects: >=1.0.0

deprecatedLegacy plugin; not actively developed. Consider migrating to the non-legacy version.

fix

Use `terser-webpack-plugin` (v4+) for new projects.

affects: >=1.0.0

gotchaDefault caching to `node_modules/.cache/terser-webpack-plugin` may cause issues in CI.

fix

Set `cache: false` or a custom path to avoid permission errors.

affects: >=1.0.0

gotchaThe `sourceMap` option must be enabled in webpack config for source maps to work.

fix

Add `devtool: 'source-map'` to webpack config.

affects: >=1.0.0

Errors

Common errors & fixes

Module not found: Error: Can't resolve 'terser-webpack-plugin'

Incorrect package name; installed the wrong package or not installed.

fix

Run: npm install terser-webpack-plugin-legacy --save-dev

TypeError: Cannot read property 'tapAsync' of undefined

Plugin incompatible with webpack 4+ because it uses webpack 3 hooks.

fix

Use terser-webpack-plugin (non-legacy) for webpack 4+.

Error: webpack.optimize.UglifyJsPlugin is not a constructor

Misunderstanding: using UglifyJsPlugin when terser plugin should be used.

fix

Use TerserPlugin from 'terser-webpack-plugin-legacy' instead.

Upgrade

Version history

1.2.5latest on npm

Audit

Dependencies

webpackrequiredpeer dependency

Agent activity

6 hits · last 30 days

node

Resources

githubhttps://github.com/webpack-contrib/terser-webpack-plugin ↗

packagehttps://www.npmjs.com/package/terser-webpack-plugin-legacy ↗