Typescript - declare a generic method

Question

I am creating a configuration class, and I would like to add a property to assign any type of functions, with any return type and any number of parameters.

How can I declare this ?

I tried this:

export class ParamClass {
    param1: string;
    param2: string;
    onclick: (...args: any[]) => {};
}

This is working but the return type of the assigned method cannot be void.

Titian Cernicova-Dragomir · Accepted Answer · 2019-10-29 08:26:07Z

2

You can just use any or unknown as the return type. Such a signature would accept void:

export class ParamClass {
    param1: string;
    param2: string;
    onclick: (...args: any[]) => unknown;
}

new ParamClass().onclick = () => { }

Play

answered Oct 29, 2019 at 8:26

Titian Cernicova-Dragomir

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