npmtypescript95% confidence\u2191 616

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

Full error message

I'm trying to use the following pattern:

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

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

interface OptionRequirements {
  [key: Option]: OptionRequirement;
}

This seems very straightforward to me, however I get the following error:

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

What am I doing wrong?

Solutionsource: stackoverflow \u2197

You can use TS "in" operator and do this: enum Options { ONE = 'one', TWO = 'two', THREE = 'three', } interface OptionRequirement { someBool: boolean; someString: string; } type OptionRequirements = { [key in Options]: OptionRequirement; // Note the "in" operator. } More about the in operator

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