In TypeScript, a mapped type is not allowed to define properties or methods

My challenge involves defining an interface with keys that match a specific enum key type. However, when I attempt to declare this type, I encounter the following error message:

A mapped type may not declare properties or methods.

Below is the code snippet in question:

enum myEnum {
  propOne = 'propOne',
  propTwo = 'propTwo'
}

export interface myInterface {
  [key in myEnum]: anotherInterface;
}

I attempted to specify the type differently as shown below, but encountered a syntax error:

export interface myInterface {
  [key in keyof typeof myEnum]: anotherInterface;
}

Even trying to use a regular object instead of an enum resulted in the same error.

Answer №1

To achieve this, utilize Mapped types instead of interfaces:

export type MyCustomType = {
  [index in myEnum]: AnotherCustomInterface;
}

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