Webpack: Make dependency using another dependency instead of its own subdependency

Question

I am using webpack to build my app and I use a library (eventemitter4) that itself depends on another library (underscore).

However, I am already using in my application an alternative to underscore (lodash and more exactly the es6 version). I would like eventemitter4 to use this later library and avoid including in my build the two.

I install my dependencies using npm install. As a result, underscore is bundled as a subdirectory inside the eventemitter4's directory.

It tried to set aliases but I could not make it work:

alias: {
  "underscore": "lodash-es",
  "lodash": "lodash-es",
  "~/underscore": "lodash-es"
}

raises

ERROR in ./~/eventemitter4/index.js
Module not found: Error: Cannot resolve module 'lodash-es' in /Users/me/myapp/node_modules/eventemitter4
@ ./~/eventemitter4/index.js 6:2-23

If I do not add "~/underscore": "lodash-es", the sub-underscore is included instead of lodash.

Any idea?

Thank you very much for your help.

Quentin Roy · Accepted Answer · 2015-09-20 12:00:18Z

1

I actually found the reason. The alias was working. The cause of the error was that lodash-es does not provide a main attribute in his package.json (it only provides an esnext:main which is not recognised by webpack).

I solve the issue by using:

alias: {
  "underscore": "lodash-es",
  "lodash": "lodash-es/lodash",
  "~/underscore": "lodash-es"
}

answered Sep 20, 2015 at 12:00

Quentin Roy

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