rollup-plugin-terser

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

Install

yarn add rollup-plugin-terser --dev

Note: this package requires rollup@0.66 and higher (including rollup@1.0.0)

Usage

import { rollup } from "rollup";
import { terser } from "rollup-plugin-terser";

rollup({
  input: "main.js",
  plugins: [terser()]
});

Why named export?

Module is a namespace. Default export often leads to function/component per file dogma and makes code less maintainable.
Interop with commonjs is broken in many cases. A ways to fight them are known.
Show me any good language with default exports. It's historical javascriptism.

Options

⚠️ Caveat: any function used in options object cannot rely on its surrounding scope, since it is executed in an isolated context.

terser(options);

options - terser API options

options.sourcemap: boolean

Generates source maps and passes them to rollup. Defaults to true.

options.numWorkers: number

Amount of workers to spawn. Defaults to the number of CPUs minus 1.

Examples

Comments

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

terser({
  output: {
    comments: function(node, comment) {
      var text = comment.value;
      var type = comment.type;
      if (type == "comment2") {
        // multiline comment
        return /@preserve|@license|@cc_on/i.test(text);
      }
    }
  }
});

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

terser({
  output: {
    comments: "all"
  }
});

See Terser documentation for further reference.

ZaneHannanAU/rollup-plugin-terser