CODEWITHSUNDEEP
typescriptgenerics
tru7
tru7

Reputation: 7212

Generic with object and method name

This is a simplified example of passing to a generic function an object and the name of a method in that object.

function invoke<TYPE_OBJ extends object>(obj: TYPE_OBJ, methodName: keyof TYPE_OBJ){

    return obj[methodName](); //*** This expression is not callable. Type '{}' has no call signatures.ts(2349)
}

What am I missing to specify that the methodName corresponds to a callable thing?

ts version 4.2.4

Upvotes: 0

Views: 72

Answers (1)

Mario Vernari
Mario Vernari

Reputation: 7304

I don't know exactly how is you case, however this seems working fine:

//example type
type TYPE_OBJ = {
  foo: () => void;
};

function invoke<TYPE_OBJ extends Record<string, () => void>>(obj: TYPE_OBJ, methodName: keyof TYPE_OBJ) {

  return obj[methodName]();
}

Upvotes: 2

Related Questions