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typescript-strict-mode

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Use when setting up a new TypeScript project, auditing an existing tsconfig.json, or reviewing code where null-reference errors or implicit any types are present.

skills/typescript-strict-mode/SKILL.md

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# Enable TypeScript strict mode in tsconfig.json

Without strict mode, TypeScript allows implicit `any` types, ignores possible `null`/`undefined` values, and silently accepts unsound function assignments — meaning the type system gives a false sense of safety. Enabling strict mode makes TypeScript catch the bugs it was designed to prevent, turning type errors into compile-time failures rather than runtime surprises in production.

## Quick Reference

- "strict": true enables strictNullChecks, noImplicitAny, and six other checks
- Enable strict from project start — retrofitting a large codebase is painful
- On existing projects: enable strictNullChecks first, then other flags incrementally
- Strict mode eliminates entire classes of null reference and implicit-any bugs

## Check

Inspect the tsconfig.json in this project and report whether "strict": true (or individual strict flags) is enabled. List any missing strict flags.
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