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Rollup plugin to minify generated bundle. UsesUglifyJS under the hood. There are a few improvements over native uglify:

• uglify is run in worker for every chunk
• errors are displayed withbabel code frame

Note: uglify-js is able to transpile only es5 syntax. If you want to transpile es6+ syntax useterser instead

yarn add rollup-plugin-uglify --dev

Note: this package requires rollup@0.66 and higher

import{rollup}from"rollup";import{uglify}from"rollup-plugin-uglify";rollup({input:"main.js",plugins:[uglify()]});

uglify(options);

options -uglifyJS API options

options.sourcemap: boolean

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

options.numWorkers: number

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

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

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

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

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

SeeUglifyJS documentation for further reference.

MIT ©Bogdan Chadkin