AGENTS.md

tab-sync

Login in one tab, every tab knows. Cross-tab state sync with auth, theme, and leader election.

Commands

npm run build # compile TypeScript npm test # run all tests (Vitest) npm run typecheck # type-check without emit (tsc --noEmit)

Stack

• TypeScript (ESM only)
• Vitest for testing
• Zero runtime dependencies

Code Style

• ESM imports/exports only. No CommonJS
• Strict TypeScript (strict: true)
• No default exports — use named exports

Boundaries

• Do not modify .env or credentials
• Do not run npm publish without maintainer approval
• Do not add runtime dependencies without discussion