openinference-typescript
TypeScript conventions for any TypeScript code in js/ (packages, examples, tests). Use whenever writing, reviewing, or modifying TypeScript in this repo.
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- Arize-ai/openinference
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- October 23, 2026 at 20:54
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- openinference-typescript
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- TypeScript conventions for any TypeScript code in js/ (packages, examples, tests). Use whenever writing, reviewing, or modifying TypeScript in this repo.
# OpenInference TypeScript Conventions
Follow existing patterns in the package you're editing (see `js/AGENTS.md`), plus:
## Naming
- No single-letter variables, including loop counters (`index`, `span`, `chunk`).
- Booleans use verb prefixes: `isStreaming`, `hasError`, `shouldMask`.
- Functions start with a verb: `getAttributes`, `parseResponse`, `buildSpanName`.
- Extract complex conditions into named booleans.
## Functions
- 2+ parameters → a single destructured object, documented with JSDoc `@param params.foo`.
- Prefer composition over inheritance, and pure transforms over mutation.
- Don't read ambient state (`Date.now()`, config singletons, module constants) deep inside utilities; expose it as an optional param defaulting to a `DEFAULT_*` constant.
## Types
- No `any`; use `unknown` and narrow with type guards. If `any` is unavoidable, comment why.
- Sparse lookup maps must allow `undefined`: `Partial<Record<K, V>>` (most packages don't enable `noUncheckedIndexedAccess`).
## Reuse
Check `@arizeai/openinference-core` and sibling packages for existing utilities before writing helpers or adding dependencies.
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