Hygiene Checks

VS Code runs a hygiene check as a git pre-commit hook. Commits will be rejected if hygiene fails.

What it checks

The hygiene linter scans all staged .ts files for issues including (but not limited to):

• Unicode characters: Non-ASCII characters (em-dashes, curly quotes, emoji, etc.) are rejected. Use ASCII equivalents in comments and code.
• Double-quoted strings: Only use "double quotes" for externalized (localized) strings. Use 'single quotes' everywhere else.
• Copyright headers: All files must include the Microsoft copyright header.

How it runs

The git pre-commit hook (via husky) runs npm run precommit, which executes:

node --experimental-strip-types build/hygiene.ts

This scans only staged files (from git diff --cached). To run it manually:

npm run precommit