How to Fix TypeScript Generic Error in AI-Built Apps
Generic type parameters cause confusing compilation errors. AI-generated generic code often has incorrect constraints, missing type parameters, or overly complex type hierarchies.
Error messages you might see
Type 'T' does not satisfy the constraint 'Record<string, unknown>'Type 'string' is not assignable to type 'T'. 'T' could be instantiated with a different subtype of constraint 'string'.Why this happens in AI-generated code
Missing generic constraints
AI creates generic functions without `extends` clauses, causing TypeScript to infer `unknown` for type parameters.
Incorrect return type narrowing
Generic functions return a broader type than the specific generic parameter, breaking type inference.
Over-abstracted generics
AI creates deeply nested generic types that are impossible to understand or extend correctly.
How to fix it
Add proper type constraints
Use `extends` to constrain generics: `function getProperty<T extends object, K extends keyof T>(obj: T, key: K): T[K]`.
Simplify generic hierarchies
Flatten deeply nested generics. If a type takes more than 3 generic parameters, it should probably be split up.
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Frequently asked questions
When should I use generics?
Use generics when a function or class needs to work with multiple types while preserving type relationships in inputs and outputs.
Why does TypeScript say my type could be instantiated differently?
You're assigning a concrete type to a generic parameter. The generic could be a more specific subtype, so TypeScript prevents the assignment.
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