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馃悰 migrate prettier uses the wrong defaults for semi and singleQuote聽#12265
Description
Environment information
Details
CLI:
Version: 2.5.15
Color support: true
Platform:
CPU Architecture: x86_64
OS: windows
Environment:
BIOME_DISTRIBUTION: npm
BIOME_LOG_FILE: unset
BIOME_LOG_PATH: unset
BIOME_LOG_PREFIX_NAME: unset
BIOME_LOG_LEVEL: unset
BIOME_LOG_KIND: unset
BIOME_CONFIG_PATH: unset
BIOME_THREADS: unset
BIOME_WATCHER_KIND: unset
BIOME_WATCHER_POLLING_INTERVAL: unset
BIOME_BINARY: unset
RUST_BACKTRACE: unset
NO_COLOR: unset
TERM: unset
JS_RUNTIME_VERSION: v26.11.1
JS_RUNTIME_NAME: node
NODE_PACKAGE_MANAGER: bun/1.4.2
Biome Configuration:
Status: Loaded successfully.
Path: biome.json
Formatter enabled: true
Linter enabled: true
Assist enabled: true
VCS enabled: true
HTML full support enabled: unset
Workspace:
Open Documents: 0
What happened?
-
Create
.prettierrc.jsonwith{}. -
Run
biome migrate prettier --write. -
The generated
biome.jsoncontains:"semicolons": "asNeeded", "quoteStyle": "single"
-
biome formatnow removes semicolons and switches to single quotes, while Prettier keepsconst greeting = "hello";as is.
Expected result
"semicolons": "always" and "quoteStyle": "double", matching Prettier's defaults (semi: true, singleQuote: false): https://prettier.io/docs/options
Code of Conduct
- I agree to follow Biome's Code of Conduct
Activity
biome-cookie commentedon Oct 11, 2026
Hello @JamBalaya56562, please provide a minimal reproduction. You MUST use one of the following options:
npm create @biomejs/biome-reproductionThese formats help us triage and fix issues faster. Failing to use these formats may cause your issue to be ignored or closed.
Issues marked with
S-Needs reprowill be closed if they have no activity within 3 days.