Terser plugin for Rollup

Rollup plugin to minify generated bundle with Terser. Uses terser under the hood.

Install

1yarn add @ducanh2912/rollup-plugin-terser --dev
2# Or with npm:
3npm i @ducanh2912/rollup-plugin-terser --save-dev
4# Or with pnpm:
5pnpm i @ducanh2912/rollup-plugin-terser --save-dev

Note: this package requires rollup@2.0.0 and higher

Usage

1import { rollup } from "rollup";
2import { terser } from "@ducanh2912/rollup-plugin-terser";
3
4rollup({
5  input: "main.js",
6  plugins: [terser()],
7});

Options

1terser(options);

options - terser API options

Note: some terser options are set by the plugin automatically:

• module: true is set when format is esm or es
• toplevel: true is set when format is cjs

Examples

Using as output plugin

1// rollup.config.js
2import { terser } from "@ducanh2912/rollup-plugin-terser";
3
4export default {
5  input: "index.js",
6  output: [
7    { file: "lib.js", format: "cjs" },
8    { file: "lib.min.js", format: "cjs", plugins: [terser()] },
9    { file: "lib.esm.js", format: "esm" },
10  ],
11};

Comments

If you'd like to preserve comments (for licensing for example), then you can specify a function to do it like so:

1terser({
2  format: {
3    comments: function (node, comment) {
4      var text = comment.value;
5      var type = comment.type;
6      if (type == "comment2") {
7        // multiline comment
8        return /@preserve|@license|@cc_on/i.test(text);
9      }
10    },
11  },
12});

Alternatively, you can also choose to keep all comments (e.g. if a licensing header has already been prepended by a previous rollup plugin):

1terser({
2  format: {
3    comments: "all",
4  },
5});

See Terser's documentation for further reference.