package.json "exports" field fallback array support

Clear and concise description of the problem

Currently vite does not support fallback array in “exports” field in package.json, vite does support array type but when first entrypoint is not accessable, an error will show. webpack 5 has already has a implementation in Alternatives.

Suggested solution

add fallback array support

Alternative

No response

Additional context

"exports": {
    "default": {
      "import": [
        "./dist/index.esm.js",
        "./src/index.tsx"
      ],
      "require": "./dist/index.umd.js"
    }
  },

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn’t already an issue that request the same feature to avoid creating a duplicate.

[Niputi]

I think this should be made at the library. I remember reading a conversation on twitter Evan had that there should be a library for making a standard way of reading the exports and resolve.exports got made for this purpose. with a github search, it can be seen at wmr, marko, dvlp and vite uses this library

[aleclarson]

See #10504