Support nested properties in resolve.mainFields

[pravdomil]

Feature request

http://2ality.com/2017/04/transpiling-dependencies-babel.html#extended-versions-of-pkgesnext

webpack.config.js:

resolve: { mainFields: ["esnext.main"] }

package.json:

{
  "esnext": {
    "main": "main-esnext.js",
    "browser": "browser-specific-main-esnext.js"
  }
}

What is the expected behavior?

support nested properties in resolve.mainFields

What is motivation or use case for adding/changing the behavior?

deliver un-transpiled source code for different platforms

How should this be implemented in your opinion?

https://github.com/rauschma/esnext-demo#rationale-and-future

Are you willing to work on this yourself?

yes

[ooflorent]

webpack already supports nested main fields:

mainFields: [["esnext", "main"], "esnext", "main"],

Support for paths will not be added because it would break builds were the dot is intentional ("esnext.main" is a valid field name).

[pravdomil]

Great!