fix: support pattern trailers

[jedwards1211]

fixes #266

Supports trailing characters after the * in wildcard exports patterns, e.g.

    "./*.js": {
      "module": "./*.js",
      "default": {
        "node": "./*b.js"
      }
    },

I copied the logic from Node's resolve implementation.

[orca-security-us]

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[guybedford]

Thanks for posting this, it is definitely a missing feature and the last missing feature before this resolver implementation can be considered complete (given this resolve feature landed in Node.js later itself).

I left a couple of comments. That said I don't think the implementation is complete and likely needs a closer look at the spec. It also needs tests to land.

If you need implementation inspiration, perhaps take a look at rollup/plugins#1549 which was very nicely written.

[guybedford]

This sort should be updated to use the order defined by PATTERN_KEY_COMPARE in https://nodejs.org/dist/latest-v20.x/docs/api/esm.html#resolution-and-loading-algorithm.

[guybedford]

Perhaps abstract this into an extensions configuration rather, so it can be configured and not necessarily the default (sincethis will match ./file.ts before file.js).

[jedwards1211]

Okay I'll go over this again soon.

Side note: it seems like a shame to have all these separate implementations of the node module resolution algorithm. Is there really no package that's flexible enough to be used in all of these cases? I've used the resolve package some before, but I haven't investigated if it's lacking anything or why we wouldn't want to depend on it here.