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How to use the runtypes.Constraint function in runtypes

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typeetfunc / runtypes-generate / src / custom.spec.ts View on Github

const ArrayWithContains = (arrRt, item, count) => (args => Constraint(arrRt, list => {
  const res = contains(
    list, args,
    () => true,
    (_, res) => `Array contains less than ${res.needCount} items`,
    (_, res) => `Array contains more than ${res.needCount} items`
  );

  return res;
}, args))({tag: contains.name, count, item})