terser-loader

library2.0.3jsnpmunverified

terser-loader is a webpack loader that minifies JavaScript using Terser, a modern ES6+ capable minifier. Version 2.0.3 is the latest stable release, with peer dependency on webpack ^4 || ^5. It offers options like `terserOptions` passed directly to Terser API and `stripTrailingSemicolon`. Unlike the official `terser-webpack-plugin`, this is a loader (not a plugin) integrated in webpack's module rules pipeline, useful for selective minification alongside other loaders. Low release cadence but functional for specific use cases.

devops web-framework testing

npm install terser-loader

github ↗package ↗

INSTALL

IMPORT

SIG · TERSER-LOADER

terser-loader

devopsjavascriptv2.0.3

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.

terser-loader

✓ import TerserLoader from 'terser-loader';

✗ const TerserLoader = require('terser-loader');

ESM default import; CommonJS require works but not recommended for modern webpack configs if using ESM.

Configures terser-loader to minify all .js files, removing console.log and trailing semicolons. Use in production builds.

// webpack.config.js const path = require('path'); module.exports = { entry: './src/index.js', output: { path: path.resolve(__dirname, 'dist'), filename: 'bundle.js', }, module: { rules: [ { test: /\.js$/, use: [ { loader: 'terser-loader', options: { terserOptions: { compress: { drop_console: true, }, }, stripTrailingSemicolon: true, }, }, ], }, ], }, mode: 'production', };

Debug

Known issues

gotchaLoader is not a plugin; it runs on each module individually, not on the final bundle. Use terser-webpack-plugin for bundle-level minification.

fix

If you need bundle-level minification, use terser-webpack-plugin instead.

affects: >=1.0.0

breakingVersion 2.0.0 dropped support for webpack <4.

fix

Upgrade webpack to ^4 || ^5, or stick to terser-loader@1 for webpack 3.

affects: >=2.0.0

deprecatedThe stripTrailingSemicolon option is non-standard and may be removed in future versions.

fix

Use terserOptions.output.semicolon = false instead.

affects: >=1.0.0

Errors

Common errors & fixes

Module not found: Error: Can't resolve 'terser'

Missing Terser peer dependency

fix

Install terser as a dev dependency: npm install --save-dev terser

ValidationError: Invalid options object. Terser Loader has been initialized using an options object that does not match the API schema.

Options passed are not recognized

fix

Check terserOptions for valid Terser options; do not use options like 'output' directly on the loader.

Error: webpack <4 is not supported

Using terser-loader@2 with webpack 3 or lower

fix

Upgrade webpack to version 4 or 5, or install terser-loader@1

Upgrade

Version history

2.0.3latest on npm

Audit

Dependencies

webpackrequiredPeer dependency – requires webpack 4 or 5 to function

Agent activity

10 hits · last 30 days

node

Resources

githubhttps://github.com/5lava/terser-loader ↗

packagehttps://www.npmjs.com/package/terser-loader ↗