fix: clean declaration maps before the build starts

[Timeless0911]

Summary

clean declaration maps before the build starts

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[Copilot]

Pull request overview

This PR adds support for cleaning declaration map files (.d.ts.map, .d.cts.map, .d.mts.map) before the build starts, ensuring that stale declaration map files are removed along with the declaration files themselves.

• Extended the cleanDtsFiles function to include declaration map file patterns
• Updated the corresponding comment to reflect that both declaration files and maps are cleaned
• Enhanced test utilities to create and verify cleanup of declaration map files

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/plugin-dts/src/utils.ts	Added glob patterns for .d.ts.map, .d.cts.map, and .d.mts.map files to the cleanDtsFiles function
packages/plugin-dts/src/index.ts	Updated comment to clarify that both dts files and maps are cleaned
tests/scripts/shared.ts	Added creation of temporary declaration map files in the test helper to verify they are properly cleaned

Comments suppressed due to low confidence (1)

tests/scripts/shared.ts:506

• The test should also create and verify that .d.ts.map files in the .rslib folder are cleaned during bundling. Currently, only dist-types map files are tested, but when bundle is true, map files could also be generated in the .rslib/declarations/{cjs,esm} directories. Consider adding:

const tempFileMapRslibCjs = join(tempDirRslib, 'tempFile.d.ts.map');
const tempFileMapRslibEsm = join(tempDirRslibEsm, 'tempFile.d.ts.map');

await fs.promises.writeFile(
  tempFileMapRslibCjs,
  'console.log("temp map file for rslib cjs");',
);
await fs.promises.writeFile(
  tempFileMapRslibEsm,
  'console.log("temp map file for rslib esm");',
);

checkFile.push(tempFileMapRslibCjs, tempFileMapRslibEsm);

  if (bundle) {
    const tempDirRslib = join(fixturePath, '.rslib', 'declarations', 'cjs');
    const tempDirRslibEsm = join(fixturePath, '.rslib', 'declarations', 'esm');
    const tempFileRslibCjs = join(tempDirRslib, 'tempFile.d.ts');
    const tempFileRslibEsm = join(tempDirRslibEsm, 'tempFile.d.ts');

    await fs.promises.mkdir(tempDirRslib, { recursive: true });
    await fs.promises.mkdir(tempDirRslibEsm, { recursive: true });

    await fs.promises.writeFile(
      tempFileRslibCjs,
      'console.log("temp file for cjs");',
    );
    await fs.promises.writeFile(
      tempFileRslibEsm,
      'console.log("temp file for esm");',
    );

    checkFile.push(tempFileRslibCjs, tempFileRslibEsm);
  }

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