Can you input a string into a generic in TypeScript and subsequently utilize it as a type/interface key?

I had high hopes for achieving this, but unfortunately it's a no-go:

type MyType<
  T extends {},
  K extends string = 'keyName'
> = T & {
  [K]: {
    value: string
  }
};

The error states that a computed property name in a type literal must refer to an expression with either a literal type or a unique symbol.ts

Is there a way to input a key and shape the resulting type or interface?

Thank you.

Answer №1

To solve this problem, remember to utilize the [key in K] syntax.

type MyType<
  T extends {},
  K extends string = "keyName"
  > = T & {
    [key in K]: {
      value: string
    }
  };

Check it out on the Playground

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