transformer: vite ssrTransform

[Boshen]

Port from
https://github.com/vitejs/vite/blob/00deea4ff88e30e299cb40a801b5dc0205ac913d/packages/vite/src/node/ssr/ssrTransform.ts

Tests at https://github.com/vitejs/vite/blob/00deea4ff88e30e299cb40a801b5dc0205ac913d/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts

[overlookmotel]

Vite uses magic string for this transform. Some of the tests require that code in output is on same line as in input. e.g.:

https://github.com/vitejs/vite/blob/00deea4ff88e30e299cb40a801b5dc0205ac913d/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts#L239-L298

I assume this is to avoid the need for source maps.

Currently we don't have ability in oxc_codegen to retain same lines in output, so I guess we would need to either:

1. Add that ability to oxc_codegen (probably not easy). or
2. Do this transform using string manipulation (magic string). or
3. Do transform via AST manipulation and generate source map.

Whether option (2) is a viable approach depends on whether this transform needs to run in concert with other transforms, or whether it always runs alone.

Broader thought: If best approach is magic string manipulation, there's an argument that this shouldn't be in Oxc transformer at all. It'd work completely differently from all the other transforms, and might be better considered a Rolldown thing.

[Dunqing]

Vite uses magic string for this transform. Some of the tests require that code in output is on same line as in input. e.g.:

https://github.com/vitejs/vite/blob/00deea4ff88e30e299cb40a801b5dc0205ac913d/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts#L239-L298

Have you seen vitejs/vite#19004?