How can I iterate over a custom literal type in TypeScript?

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For those of you visiting this question using TypeScript >= 3.4, I believe the best practice is now to create a constant array of strings and then use the type of operator.

Example:

export const markets = ['au', 'br', 'de'] as const;
export type Market = typeof markets[number];

markets.forEach((market: Market) => {
    console.log(market);
});

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