Using TypeScript to define attributes by merging specified attribute names with variable attribute names

Can a TypeScript type/interface be created with the specified structure below?

interface Model {
  id: number;
  something: string;
  somethingElse: Date;

  [key: string]: string | null;
}

It essentially consists of both defined attributes and 0 to n undefined attributes. Is this achievable?

Answer №1

Referencing

Attempt:

type Entity = {
  identifier: number
  aspect: string
  alternative: Date
} & {
  [key: string]: string | null
}

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