How to Fix TypeScript Strict Mode Errors in AI-Built Apps
Enabling strict mode in tsconfig reveals hundreds of errors in AI-generated code. AI tools often generate code that works with lenient settings but fails under strictNullChecks, noImplicitAny, and other strict flags.
Error messages you might see
Object is possibly 'undefined'. (ts2532)Type 'string | undefined' is not assignable to type 'string'. (ts2322)Why this happens in AI-generated code
Missing null checks
AI code accesses properties on objects that could be null or undefined without narrowing first.
Optional properties treated as required
AI reads optional fields from API responses or configs without checking if they exist.
Implicit any from untyped libraries
Third-party packages without type definitions cause implicit any errors in strict mode.
How to fix it
Use optional chaining and nullish coalescing
Replace `obj.prop` with `obj?.prop` and provide defaults with `??` to handle undefined values safely.
Enable strict mode incrementally
Enable one strict flag at a time (`strictNullChecks` first) and fix errors in batches rather than all at once.
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Frequently asked questions
Should I enable strict mode?
Yes. Strict mode catches real bugs at compile time. All new projects should start with strict mode enabled.
How do I fix hundreds of strict mode errors?
Use `// @ts-expect-error` temporarily on specific lines, then fix them incrementally. Don't use `// @ts-ignore` as it suppresses future errors too.
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