TS2394: This overload signature is not compatible with its implementation signature-CodePudding

I am fairly new to TS and learning function overloading. Somehow I am making a mistake that I can't seem to identify . The snippet is

function parseCoordinate(obj : Coordinate): Coordinate; function parseCoordinate(str : String): Coordinate; function parseCoordinate(x: number, y: number): Coordinate; function parseCoordinate(arg1: unknown, arg2: unknown): Coordinate { let coord: Coordinate = { x: 0, y: 0 }
if (typeof arg1 === 'object') {
    coord = {
        ...(arg1 as Coordinate)
    }
} else {
    coord = {
        x: arg1 as number,
        y: arg1 as number
    }
}
return coord; }

I am told the titualr error for first line

CodePudding user response：

the reason is your implementation requires 2 parameters

parseCoordinate(arg1: unknown, arg2: unknown)

and 1 param overloads aren't compatible with 2 argument calls. to fix it make 2nd parameter optional by using ?

parseCoordinate(arg1: unknown, arg2?: unknown)