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writing-typescript

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<!-- Pi platform guidance -->
<!-- Use installed tool names. Discover callable tools before batching independent calls in codemode; model-only UI/orchestration tools must be called directly. -->
<!-- Read required skill/instruction files through direct read when exposed or through Code Mode. If an optional pruning extension is installed, verify its output protection semantics; do not assume nested-path protection. Code Mode composes calls; subagents or controllers own durable workflows. Async subagents notify natively: yield rather than poll. -->


# TypeScript Development

Follow the repository's TypeScript version, tsconfig, package manager, framework, and test runner. In a monorepo, work from the nearest `package.json` and `tsconfig.json` and name the package you chose.

## Defaults

- Never weaken compiler options to pass a check. New configs enable `strict`, `noUncheckedIndexedAccess`, `exactOptionalPropertyTypes`, `useUnknownInCatchVariables`, `noImplicitOverride`, and `noFallthroughCasesInSwitch`.
- Treat HTTP responses, JSON, env, storage, form data, and SDK output as `unknown`. Narrow at the boundary with the project's schema library or a small type guard; never cast `await res.json()` to a domain type.
- Avoid `any`, `as` casts, non-null `!`, and broad index signatures unless a runtime check or an external type gap justifies them.
- Discriminated unions for variants and async state, with an exhaustive `never` check. Literal unions or `as const` arrays instead of new enums. `satisfies` for config maps.
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