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Home/ Questions/Q 1329
Answered
Anonymous
Anonymous
Asked: February 2, 20222022-02-02T10:09:10+00:00 2022-02-02T10:09:10+00:00

Can’t cast a function inside an object to a type

I try to cast a function inside an object to a type.

Why does this not work?

export type Validator<TInput> = (
  input: TInput
) => Promise<{ [key: string]: string }>;

const works: Validator<string> = async (input) => {
  return {};
};

const doesNotWork = {
  myFancyProperty: Validator<string> = async (input) => {
    return {};
  }
}

=> 'Validator' only refers to a type, but is being used as a value here.

What’s the correct syntax? I’ve searched and tried for an hour now. Maybe i am to tired.

typescript
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    Ghulam Nabi
    2022-02-02T10:09:36+00:00Added an answer on February 2, 2022 at 10:09 am

    You can’t specify a property type in that way.

    Your best bet is to type the object, rather than the property:

    const works1: {myFancyProperty: Validator<string>} = {
        myFancyProperty: async (input) => {
            return {};
        },
    };
    

    But in rare cases, you might use a type assertion on the value you’re assigning:

    const works2 = {
        myFancyProperty: (async (input) => {
            return {};
        }) as Validator<string>,
    };
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