[ES 6] Using uglify-es prints warning during webpack build

[tobias-kuendig]

I just switched from uglify-js#harmony to uglify-es and now I am receiving the following warning during my webpack build. Everything works as expected though...

WARNING in ./~/uglify-es/tools/node.js
18:11-32 Critical dependency: the request of a dependency is an expression
webpack: Compiled with warnings.

[alexlamsl]

The warning message isn't produced by uglify-es - please consult with the project in your toolchain which produces it.

[tobias-kuendig]

It looks like webpack is having problems with dynamic imports.

Changing return require.resolve(file); in node.js to return require.resolve('' + file); removes the warnings.

see webpack/webpack.js.org#1099