Typescript get Parameters from a dynamic function

Question

I want to get the parameters of a function that is saved in different modules. For example myFunction gets the function I desired, then it should be executed with the correct parameters. However the Parameters line shows the following error: Type 'Function' does not satisfy the constraint

public Execute(module: any, myFunction: Function, params: string){
     type TestArgsType = Parameters<typeof myFunction>;
     myFunction.apply(module, params);
}

Is there any way to use the Parameters with a function passed as a parameter?

CertainPerformance · Accepted Answer · 2022-06-16 23:18:57Z

1

You can if you make yours generic.

const Execute = <T extends (...args: unknown[]) => unknown>(module: any, myFunction: T, params: string){
     type TestArgsType = Parameters<T>;

or

const Execute = <TestArgsType extends unknown[]>(module: any, myFunction: (...args: T) => unknown, params: string){

You might also consider typing module to be something more precise, or at least unknown - using any defeats the purpose of TypeScript.

answered Jun 16, 2022 at 23:18

CertainPerformance

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