tools/plural/typescript/index.ts

export type WordForms = [string, string, string];

export const plural = (count: number, words: WordForms): string => {
    const cases = [2, 0, 1, 1, 1, 2];
    return words[
      count % 100 > 4 && count % 100 < 20 ? 2 : cases[Math.min(count % 10, 5)]
    ];
  };