Support `publishConfig.directory`

[Janpot]

Clear and concise description of the problem

Currently publishing packages with pnpm publishConfig.directory. This setting causes the specified folder to be published instead of the package root folder. We generate a ./dist/package.json file with exports translated from exports in the ./package.json (those point to our sources). This feature would avoid us from having exports.devExports rewriting the package.json constantly between production and development.

Suggested solution

When publishConfig.directory is set in package.json, copy the package.json to the output folder and rewrite the exports field

Alternative

No response

Additional context

Reflecting on this, I presume the current solution has superior "transpilePackages" support

Validations

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• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.