💅 `noRedundantUseStrict` flags "use strict" in files it shouldn't

[md384]

Environment information

Details

CLI:
  Version:                      2.4.11
  Color support:                true

Platform:
  CPU Architecture:             aarch64
  OS:                           macos

Environment:
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  BIOME_WATCHER_POLLING_INTERVAL:    unset
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  TERM:                         xterm-256color
  JS_RUNTIME_VERSION:           v24.13.0
  JS_RUNTIME_NAME:              node
  NODE_PACKAGE_MANAGER:         unset

Biome Configuration:
  Status:                       Loaded successfully
  Path:                         biome.jsonc
  Formatter enabled:            true
  Linter enabled:               true
  Assist enabled:               true
  VCS enabled:                  false
  HTML full support enabled:    unset

Linter:
  JavaScript enabled:           unset
  JSON enabled:                 unset
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  Recommended:                  true
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    complexity/noAdjacentSpacesInRegex
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    correctness/noConstAssign
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    suspicious/noWith
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    suspicious/useGoogleFontDisplay
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Workspace:
  Open Documents:               0

Rule name

lint/suspicious/noRedundantUseStrict

Playground link

https://biomejs.dev/playground/?tab=formatter&pane=Diagnostics&files.package.json=ewB9AAoA&files.script.js=IgB1AHMAZQAgAHMAdAByAGkAYwB0ACIACgAKAGMAbwBuAHMAbwBsAGUALgBsAG8AZwAoACIAaABlAGwAbABvACAAdwBvAHIAbABkACIAKQAKAA%3D%3D

Expected result

The noRedundantUseStrict is flagging (and removing) "use strict" from JS files even if the type is not set in package.json. The rule says it will only flag them if type is set to module but it does so also if type is not explicitly set - see the playground link.

Code of Conduct

• I agree to follow Biome's Code of Conduct

[siketyan]

Though Node.js treats a .js file as CommonJS if no type field is specified in package.json, it seems Biome treats .js file as ESM by default, as described in useStrictMode. Given that, this is not a bug. Maybe we can add an option to treat these files as CommonJS?

[ematipico]

The world is moving towards ESM by default, and Biome is a modern toolchain.

I would prefer fixing the docs and diagnostics. And if users need to use the directive, they should prefer cjs