Expand skipped paths.

[mtth]

Path keys corresponding to skipped paths (where the value is false) did not get expanded, so only module IDs were supported. This lets us skip relative paths as well.

[defunctzombie]

Just to make sure I understand this change. Previously a browser field value of:

browser: {
    "./local-file.js": false
}

Would not work when required from another module (require(foo/local-file)) because the path would not be expanded? And this PR fixes that behavior?

[mtth]

This is for requires inside the same package. Assuming the following folder structure (a bit contrived for simplicity):

• index.js (with require('./lib/hide'))
• lib/
  • index.js (with require('./hide'))
  • hide.js (should be always skipped for browser builds)

In this case, we have to set both ./hide and ./lib/hide to false in package.json (which wouldn't be the case if they were just relocated):

browser: {
    "./hide": false,
    "./lib/hide": false
}

With this change, skipped keys behave the same as relocated ones. Hope this makes sense.

[defunctzombie]

Makes perfect sense. Great fix!