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Purpose
Use packages/prettier-compare/ to inspect any differences between Biome and Prettier formatting (including IR output) before shipping formatter changes.
Prerequisites
- Run every command from the repository root so relative paths resolve correctly.
- Use
bun (the CLI is a Bun script) and ensure dependencies have been installed.
- Always pass
--rebuild so the Biome WASM bundle matches your current Rust changes.
Common workflows
Snippets passed as CLI args:
bun packages/prettier-compare/bin/prettier-compare.js --rebuild 'const x={a:1,b:2}'
Force a language (useful when the tool cannot infer it from a filename):
bun packages/prettier-compare/bin/prettier-compare.js --rebuild -l ts 'const x: number = 1'
Compare files on disk:
bun packages/prettier-compare/bin/prettier-compare.js --rebuild -f src/example.tsx
Read from stdin (great for piping editor selections):
echo 'const x = 1' | bun packages/prettier-compare/bin/prettier-compare.js --rebuild -l js
Tips
- Use
-l/--language when formatting code without an extension so both formatters pick the correct parser.
- Use
-f/--file for large samples or snapshot tests so you can iterate directly on project fixtures.
- Reference
packages/prettier-compare/README.md for deeper CLI details; mirror any updates here, keeping the hard requirement that commands include --rebuild.
- Use single quotes for code snippets passed as CLI arguments to avoid shell interpretation issues.
- "\n" does not get escaped into a newline when passed as a CLI argument. You should write a literal newline or use a file instead.
Weekly Installs
44
Repository
biomejs/biome
GitHub Stars
24.0K
First Seen
Feb 18, 2026
Security Audits
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Installed on
opencode44
github-copilot44
codex44
kimi-cli44
gemini-cli44
amp44
