How to Fix TypeScript Any Types in AI-Built Apps
Your codebase is riddled with `any` types that defeat the purpose of TypeScript. AI code generators frequently use `any` as a shortcut, hiding bugs that would otherwise be caught at compile time.
Error messages you might see
Unexpected any. Specify a different type. (@typescript-eslint/no-explicit-any)Parameter 'data' implicitly has an 'any' type. (ts7006)Why this happens in AI-generated code
AI defaults to any for unknown shapes
When AI isn't sure of a type, it uses `any` instead of creating proper interfaces or using `unknown`.
Missing API response types
Fetch calls return untyped data that propagates `any` through the entire call chain.
Event handler parameters untyped
AI-generated event handlers use `any` for event objects instead of specific React or DOM event types.
How to fix it
Replace any with unknown
Use `unknown` instead of `any` and narrow the type with type guards. This forces you to validate data before using it.
Generate types from your API
Use tools like `openapi-typescript` or Zod schemas to generate TypeScript types from your API contracts.
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Frequently asked questions
Is using 'any' ever acceptable?
Only in rare cases like type assertions for third-party libraries with missing types. It should never be the default choice.
How do I find all 'any' types in my codebase?
Enable the `no-explicit-any` ESLint rule or run `tsc --noImplicitAny` to surface all implicit and explicit any usages.
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