index.js.flow

/* @flow */

type EnumDefinition<T> = {[key: $Keys<T>]: $Keys<T>};

declare type Enum<T> = {
  [key: $Keys<T>]: $Keys<T>,
  forEach: (iter: (val: $Keys<T>) => void) => void,
};

declare module.exports: {
  make: (dfn: EnumDefinition<*>) => Enum<*>,
  coalesce: (obj: Enum<*>, field: ?$Keys<*>) => ?$Keys<*>,
  enforce: (obj: Enum<*>, field: $Keys<*>) => $Keys<*>,
};