TS2554: Expected N arguments, but got M - in CI

By Kaveh Alemi·Latchkey

You called a function with more or fewer arguments than its signature allows.

What this error means

Type-checking fails with TS2554 stating the expected and actual argument counts.

src/api.ts(22,5): error TS2554: Expected 2 arguments, but got 1.

Common causes

How to fix it

Pass the required arguments

1. Supply every required argument the signature expects

fetchUser(id, { signal })

Make a parameter optional or defaulted

1. If the parameter is genuinely optional, mark it with ? or give a default

function fetchUser(id: string, opts?: Options) {}

How to prevent it

• Keep call sites in sync with signatures and run tsc --noEmit in CI to catch arity changes early.

Frequently asked questions

Related guides

References

• Node.js documentation
• npm CLI documentation
• GitHub Actions documentation