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PSA: Next version of UglifyJS and ecosystem

See original GitHub issue

Summary:

uglifyjs-webpack-plugin or webpack.optimize.UglifyJsPlugin will be upgraded to 1.0.x in a week and uses uglify-js@3/uglify-es
uglify-js@3 is not backward compatible to uglify-js@2, to which the latter is used in current upstream version (0.4.6) of uglifyjs-webpack-plugin

New features:

(Uglify-Es) ES6+ minification
(uglifyjs-webpack-plugin) UglifyJS parallelization (!)
(uglifyjs-webpack-plugin) Selective minification (you can include/exclude files to minify)

https://github.com/mishoo/UglifyJS2/tree/harmony https://github.com/webpack-contrib/uglifyjs-webpack-plugin

Currently in beta or prerelease stage, will be upstreamed sooner or later.

Code impacted: #1

https://github.com/webpack-contrib/uglifyjs-webpack-plugin/issues/95#issuecomment-318125994

Issue Analytics

State:
Created 6 years ago
Comments:11 (6 by maintainers)

Top GitHub Comments

2reactions

pencilcheckcommented, Oct 31, 2017

Turns out the way to fix this is to use the comment suggestion by @rwieruch https://github.com/zeit/next.js/issues/1195#issuecomment-326901737

A newer Uglify fixed it. I’m guessing because the current Uglify bundled doesn’t support the new ES6 syntax fully, therefore it bugged out.

0reactions

stevefan1999-personalcommented, Oct 17, 2017

@pencilcheck Purge .next/ folder and node_modules then try building the project again.

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