How to create Enum module in Flow around version 0.72.0

colors.js

// From https://github.com/facebook/flow/issues/627#issuecomment-389668600

// Pay special attention to:
// 1. We are casting each value to its own, as otherwise all of them would be strings
// 2. Freezing would be strictly required if we weren't casting each value to its
//    own (1), but as we are, its becomes optional here from the flow point of view
const all = Object.freeze({
  green: ("COLOR_GREEN": "COLOR_GREEN"),
  red: ("COLOR_RED": "COLOR_RED"),
  yellow: ("COLOR_YELLOW": "COLOR_YELLOW"),
});

type Color = $Values<typeof all>;

// optional but sometimes useful too
// we are casting to any as Object.values returns Array<mixed> and mixed can't be casted
const values: Array<Color> = Object.freeze((Object.values(all): any));

export {all as default, values};

export type {Color};

otherModule.js

import colors, {values as colorValues} from "./colors";
import type {Color} from "./colors";

type SomethingRed = {
  color: typeof colors.red
};

const thing: SomethingRed = {color: colors.red};

const color1: Color = colors.green;
const color2: Color = colors.red;
const color3: Color = colors.yellow;

console.log(colorValues); // ["COLOR_GREEN", "COLOR_RED", "COLOR_YELLOW"]