An index signature parameter type cannot be a union type. Consider using a mapped object type instead

Question

I\'m trying to use the following pattern:

enum Option {
  ONE = \'one\',
  TWO = \'two\',
  THREE = \'three\'
}

interface OptionRequirement {
  someBool: bo         


        

Answer 1

Instead of using an interface, use a mapped object type

enum Option {
  ONE = 'one',
  TWO = 'two',
  THREE = 'three'
}

type OptionKeys = keyof typeof Option;

interface OptionRequirement {
  someBool: boolean;
  someString: string;
}

type OptionRequirements = {                 // note type, not interface
  [key in OptionKeys]: OptionRequirement;   // key in
}