The unknown number of arguments in a Typescript generic type

I'm currently working on developing a function that utilizes a generic type to take in a function, an array of arguments for the function, and then apply them accordingly. However, I am facing an issue with TypeScript not correctly interpreting the args type.

  const animate = async <P, A>(
    action: (payload: P) => any,
    algorithm: (...args: A[]) => P[],
    args: A[]
  ) => {
    if (state.playing) return;
    dispatch(togglePlaying());
    const sequence = algorithm(...args);
    for (let element of sequence) {
      await delay(1);
      dispatch(action(element));
    }
    dispatch(togglePlaying());
  };

Upon attempting to use this function, I encountered the following error:

Argument of type '(rows: number, cols: number, startCell: Coordinates, endCell: Coordinates) => GridT[]' is not assignable to parameter of type '(...args: (number | Coordinates)[]) => GridT[]'

Answer №1

For the solution, utilize the Parameters<Type> type: https://www.typescriptlang.org/docs/handbook/utility-types.html#parameterstype

This creates a tuple type based on the parameter types of a function type Type.

To implement this, define your function in the following way:

const animate = async <P, F extends (...args: any[]) => P[]>(
    action: (payload: P) => any,
    algorithm: F,
    args: Parameters<F>
) => {
    // Implementation code here
}

The issue you are facing is due to defining the type of algorithm as (...args: A[]) => P[], which essentially implies that every argument is expected to be of the same type (in your case, either number or Coordinates). Therefore, when attempting to pass a function with the signature

(rows: number, cols: number, startCell: Coordinates, endCell: Coordinates) => GridT[]
, it results in a mismatch.

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