The parameter does not accept a string as an argument, it only allows for values of "one", "two", "three", "four", "five", or "six"

I'm facing a challenge with my specific type:

type OtpCode = {
  one: string;
  two: string;
  three: string;
  four: string;
  five: string;
  six: string;
};

I want to iterate through this object and assign values:

Object.keys(defaultValues).forEach((x, i) => {
      codeValuesForm.setValue(x, 'sometesttext');
    });

The type of x is OtpCode, and Typescript is giving me an error stating

Argument of type 'string' is not assignable to parameter of type '"one" | "two" | "three" | "four" | "five" | "six"'.

How can I resolve this issue to successfully iterate through this object?

typescripttypesreact-typescript

Answer №1

Although Object.keys() unfortunately returns string[] and not a combination of the keys present in the object you provide. There are numerous other resources available that may assist you in discovering a suitable resolution, such as:

  • Why doesn't Object.keys return a keyof type in TypeScript?

  • TypeScript: Object.keys return string[].

Most of the time, you can manage by explicitly type-casting, for example:

Object.keys(defaultValues).forEach((key) => { key }); // string
(Object.keys(defaultValues) as (keyof OtpCode)[]).forEach((key) => { key }); // keyof OtpCode

TypeScript Playground

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