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typescript

TS2554: Expected N arguments, but got M

You called a function with the wrong number of arguments. TypeScript enforces the parameter count of every function call — extra arguments or missing required arguments are both caught at compile time.

Common causes

Passing too many arguments to a function that doesn't accept that many
Forgetting a required argument — all non-optional parameters must be provided
The function signature changed but the call sites weren't updated
Calling a method on the wrong type that has a different signature than expected

How to fix it

Check the function signature and pass exactly the required arguments
Make extra parameters optional if they shouldn't be required: function fn(a: string, b?: number)
Add rest parameters if the function should accept any number of arguments: function fn(...args: string[])
Update call sites to match the new function signature after a refactor

Example

function add(a: number, b: number): number { return a + b; }
add(1, 2, 3);
// error TS2554: Expected 2 arguments, but got 3.

Passing three arguments to a function that only accepts two

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