Common causes
- Passing an argument type that doesn't match any of the function's overload signatures
- Using a value that's too broad — a union type that covers cases outside all overloads
- Combining argument types in a way no single overload accepts
- A library's overloads don't cover the combination you need
How to fix it
- Check the function's overloads in its type definitions and match your call to one of them
- Narrow the argument type before calling: if (typeof val === 'string') { fn(val) }
- Cast the argument to the type the matching overload expects: fn(val as string)
- Read the error details — TypeScript shows each overload and what didn't match
Example
setTimeout(() => {}, '1000');
// error TS2769: No overload matches this call.
// Argument of type 'string' is not assignable to parameter of type 'number | undefined'.Passing a string as the delay argument to setTimeout, which expects a number
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