[@rollup/plugin-typescript]: Source-map source paths break if "sourceRoot" is specified

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
typescript
Domain
build-system

Research direction

Start with the StackBlitz reproduction and inspect tsconfig.json alongside dist/index.js.map, first comparing the generated source paths with and without sourceRoot. Trace how the TypeScript plugin produces the map and verify that each path resolves correctly beneath the configured source root when done.

Written by the indexing model from the issue text.

Description

Expected Behavior

Each path reference inside the source map leads to a source file inside the source root.

Actual Behavior

The paths are invalid if a source root is specified and repeat the path to the source file after the path to the directory containing the source file (see dist/index.js.map inside the stackblitz)

Additional Information

If the sourceRoot option is removed from the compilerOptions, it works as expected.

Dominant language
JavaScript
Stars
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Forks
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PR merge metrics
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Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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