What is the correct way to apply type in the .call() method?

I need help finding a solution for the following issue

interface IName {
  name:string;
}

let obj1:IName = {
  name: "LINUS"  
}


function profileInfo (age:number,location:string):string{
  return `${this.name} is ${age} years old and is from ${location}` // << Error here  as 'this' implicitly has type 'any' because it does not have a type annotation
}

// call
let res = profileInfo.call(obj1,23,'Bangkok')
console.log(res);

I was testing out the call method to bind obj1 with the profileInfo function.

If you have any suggestions or solutions, please share them.

The code works fine in regular JavaScript, though.

Answer №1

To indicate the context of this in TypeScript, you can use a parameter annotation:

function displayDetails(this: IPerson, age: number, location: string): string {
    return `${this.name} is ${age} years old and lives in ${location}`;
}

Keep in mind that this will catch errors when calling displayDetails without specifying the correct this context:

// Incorrect call:
displayDetails(25, 'Paris'); // Error: The 'this' context of type 'void' is not compatible with the method's 'this' of type 'IPerson'.

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