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.ai-rulez/rules/typescript-conventions.md
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.ai-rulez/rules/typescript-conventions.md
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priority: high
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---
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- `strict: true` + `noUncheckedIndexedAccess` in tsconfig, never `any` — use `unknown` with type guards.
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- ESM imports only, `const` over `let`, `as const` for literals, `interface` over `type` for objects.
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- `import type` for type-only imports to avoid runtime overhead. Discriminated unions for type-safe state.
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- Formatting/linting: `oxfmt` + `oxlint`. Type checking: `tsc --noEmit` in CI.
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- Testing: `vitest` (80%+ coverage). Runtime validation at system boundaries with `zod`.
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- Error handling: discriminated unions for expected errors, throw only for unexpected.
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- Package manager: `pnpm` with `pnpm-lock.yaml` committed, build: `tsup` or `esbuild`.
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- Monorepo: workspace protocol (`workspace:*`), shared tsconfig base, `pnpm-workspace.yaml`.
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- Node.js: `node:` prefix for core modules, `fetch` over `axios`.
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- Security: `pnpm audit` for dependency CVE scanning. Zero tolerance for critical/high vulnerabilities.
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- Anti-patterns: non-null assertions (`!`), type assertions (`as`), `enum` (use unions), `@ts-ignore`.
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