cwd, source_root, and source_file_name options do not have any effect

[kherock]

Describe the bug
I was trying to figure out why certain options in the CLI weren't working but it looks like the transform functions simply don't do anything with the options listed in the PR title.

Input code

> swc = require('@swc/core');
> swc.transformSync('var foo = 1;\nexport { foo };\n', { sourceMaps: true, sourceRoot: '..', sourceFileName: 'foo'  })
{
  code: 'var foo = 1;\nexport { foo };\n',
  map: '{"version":3,"sources":["<anon>"],"sourcesContent":["var foo = 1;\\nexport { foo };\\n"],"names":[],"mappings":"IAAA,GAAA,GAAA,CAAA;SACA,GAAA"}'
}

> swc.transformFileSync('fixtures/amd.js', { sourceMaps: true, cwd: 'out', sourceRoot: '..' })
{
  code: 'var foo = 1;\nexport { foo };\n',
  map: '{"version":3,"sources":["fixtures/amd.js"],"sourcesContent":["\\nconst foo = 1;\\nexport { foo };"],"names":[],"mappings":"IACA,GAAA,GAAA,CAAA;SACA,GAAA"}'
}
> swc.transformFileSync('../fixtures/amd.js', { sourceMaps: true, cwd: 'out' })
thread '<unnamed>' panicked at 'failed to load file: Os { code: 2, kind: NotFound, message: "No such file or directory" }', native/src/transform.rs:158:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Config

{
    "jsc": {
        "parser": {
            "syntax": "typescript"
        }
    },
    "module": {
        "type": "commonjs"
    }
}

Expected behavior
Here, I'd expect "sources" to not have an anonymous filename, and "sourceRoot" should be set to "..". When a cwd is passed to transformFileSync, the source file in the sibling directory should resolve with a path relative to cwd.

Version
The version of @swc/core: 1.2.47

Additional context
I'm currently fighting this when trying to use @swc/cli as a drop-in replacement for tsc, TypeScript generates its maps using paths relative to the output directory, but currently the only way to achieve the same effect with swc is by starting the process from the output directory itself.

[realtimetodie]

I am working on this

Related

• feat(bindings/swc_cli): Append the sourceMappingURL= source map file … #6873
• [Bug]: Sourcemap links are not generated aspect-build/rules_swc#146

[realtimetodie]

@kdy1 This can be marked as resolved.

[kdy1]

Thank you!

[swc-bot]

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