sourceMap: false is not being respected

[brc-dd]

Describe the bug

UnpluginIsolatedDecl({ transformer: 'oxc', sourceMap: false }) still emits index.d.ts.map

Might be an issue with oxc, typescript transformer works fine 👀

Reproduction

• Clone https://github.com/brc-dd/oxc-id-sourcemap-issue
• Run rm -rf dist && node build.mjs
• There is index.d.ts.map in dist directory.

System Info

System:
    OS: macOS 15.1.1
    CPU: (8) arm64 Apple M1
    Memory: 388.44 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 22.11.0 - ~/.local/state/fnm_multishells/1482_1733160171083/bin/node
    Yarn: 1.22.22 - ~/.local/state/fnm_multishells/1482_1733160171083/bin/yarn
    npm: 10.9.0 - ~/.local/state/fnm_multishells/1482_1733160171083/bin/npm
    pnpm: 9.14.4 - ~/.local/state/fnm_multishells/1482_1733160171083/bin/pnpm
    bun: 1.1.38 - /opt/homebrew/bin/bun
  Browsers:
    Safari: 18.1.1

Used Package Manager

pnpm

Validations

• Follow our Code of Conduct
• Read the Contributing Guide.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A, please open a GitHub Discussion instead.
• The provided reproduction is a minimal reproducible of the bug.

[sxzz]

Looks like it's a bug in Oxc 🤔