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.