Typescript interface for a class method error

Question

Why do I get error "the string is not assignable to iGreet" ?

  interface iGreet {
    (p: string ): string
  }


  class C {
    greeting: string;

    constructor(message: string) {
      this.greeting = message;
    }

    greet(p: string): iGreet {
      return "Hello, " + this.greeting + " " + p;
    } 
  }

  let greeter = new C("world");
  console.log(greeter.greet("test"))

You're saying the method greet should return an iGreet, but right now it returns a string. — Etheryte
– Etheryte, Commented Sep 27, 2022 at 22:54

k.tten · Accepted Answer · 2022-09-27 22:55:04Z

1

greet(p: string): iGreet is saying this function returns iGreet. If you want to annotate the type of greet, you'll need to use an assignment like this:

greet: iGreet = function (p) {
    // ...
}

answered Sep 27, 2022 at 22:55

k.tten

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