Description

This PR dedupes some code by changing the rollup config and sharing the code with the main code base and the runtime code base.

Sharing code between the main bundle and the runtime bundle is challenging because the main code base should not be included in the runtime bundle. Therefore, this pull request accepts the same code to be included in both the main bundle and the runtime bundle. Since the same code is already included in the main bundle and runtime bundle, the file size will not be larger than before.

There's more code that can be shared but I left them for now to keep this PR smaller.

The new directory structure

• packages/vite
  • src
    • node: files that will be bundled in the main bundle
      • ssr/runtime: files that uses runtime bundle from the main bundle. To import the runtime bundle, use import 'vite/runtime'.
    • runtime: files that will be bundled in the runtime bundle
    • shared: files shared among client/node/runtime

What I did

• made a separate bundle for runtime rather than a separate entry point
  • I changed rollup.config.ts, rollup.dts.config.ts, src/node/tsconfig.json, vitest.config.ts
• removed the copied code from @jridgewell/trace-mapping and used the original package with patch + replace
• moved the runtime related code to src/runtime
• made src/shared/utils.ts and src/shared/constants.ts; moved some functions that are used from both src/node and src/runtime

Additional context

• How much should be make the runtime bundle lightweight? I remember that it should be lightweight for perf.
  • @sheremet-va Is it the file size that affects the performance? or is it the number of statements? I mean does including a large comment affect performance?
  • What I did in this PR to keep the file size:
    • I added rollup-plugin-esbuild to remove comments and reduce the number of statements.
    • replaced bias === LEAST_UPPER_BOUND with true so that some code from @jridgewell/trace-mapping will be tree shaken
    • patched @jridgewell/resolve-uri to make some code tree-shaken the change is now merged
  • Should we completely minify the runtime bundle?

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines, especially the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Update the corresponding documentation if needed.
• Ideally, include relevant tests that fail without this PR but pass with it.