Obtain merged types by accessing a particular property within a deeply nested object

My query is reminiscent of a post on Stack Overflow titled Get all value types of a double-nested object in TypeScript

However, my specific requirement involves extracting union types from the values of a designated property.

const tabsEnum = {
  IDCardReview: {
    label: 'ID Card',
    key: '1',
  },
  PrescriptionReview: {
    label: 'Prescription Review',
    key: '2',
  }
} as const;

I am aiming to generate a union type such as type Key = '1' | '2'. This entails utilizing the values stored in the key property within each object.

typescripttypescript-typings

Answer №1

const tabsEnum = {
    IDCardReview: {
      label: 'ID Card',
      key: '1',
    },
    PrescriptionReview: {
      label: 'Prescription Review',
      key: '2',
    }
  } as const;

  type Tabs = typeof tabsEnum;
  type ValueOfLT;T>T; = T[keyof T];
  type ValueTabs = ValueOfLT;Tabs>T;;
  type K = ValueTabs['key'];

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