Typing Object

Source

// dictionary = any number of properties of the same type
interface StringDictionary {
  [key: string]: string;
}

const obj: StringDictionary = {
  key1: "value-1",
  key2: "value-2",
  keyn: "value-n"
};

// record = equivalent to dictionary above
const obj: Record<string, string> = {
  key1: "value-1",
  key2: "value-2",
  keyn: "value-n",
};

// enums
enum KeysEnum {
  FIRST = "firstKey",
  SECOND = "secondKey",
}

type EnumDictionary = Record<KeysEnum, string>;

const obj: EnumDictionary = {
  [KeysEnum.FIRST]: "value1",
  [KeysEnum.SECOND]: "value2",
};