Function init

src/index.js:102–132

({
  // Fallback if the user does not pass in a CSPRNG. This should be OK
  // because we don't rely solely on the random number generator for entropy.
  // We also use the host fingerprint, current time, and a session counter.
  random: rand = random,
  counter = createCounter(Math.floor(rand() * initialCountMax)),
  length = defaultLength,
  fingerprint = createFingerprint({ random: rand }),
} = {})

const initialCountMax = 476782367;

const init = ({
  // Fallback if the user does not pass in a CSPRNG. This should be OK
  // because we don't rely solely on the random number generator for entropy.
  // We also use the host fingerprint, current time, and a session counter.
  random: rand = random,
  counter = createCounter(Math.floor(rand() * initialCountMax)),
  length = defaultLength,
  fingerprint = createFingerprint({ random: rand }),
} = {}) => {
  if (length > bigLength) {
    throw new Error(
      `Length must be between 2 and ${bigLength}. Received: ${length}`,
    );
  }
  return function cuid2() {
    const firstLetter = randomLetter(rand);

    // If we're lucky, the `.toString(36)` calls may reduce hashing rounds
    // by shortening the input to the hash function a little.
    const time = Date.now().toString(36);
    const count = counter().toString(36);

    // The salt should be long enough to be globally unique across the full
    // length of the hash. For simplicity, we use the same length as the
    // intended id output.
    const salt = createEntropy(length, rand);
    const hashInput = `${time + salt + count + fingerprint}`;

    return `${firstLetter + hash(hashInput).substring(1, length)}`;
  };
};

const createId = lazy(init);
function lazy(fn) {