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let { urlAlphabet } = require('./url-alphabet/index.cjs') let random = bytes => crypto.getRandomValues(new Uint8Array(bytes)) let customRandom = (alphabet, defaultSize, getRandom) => { let mask = (2 << (Math.log(alphabet.length - 1) / Math.LN2)) - 1 let step = -~((1.6 * mask * defaultSize) / alphabet.length) return (size = defaultSize) => { let id = '' while (true) { let bytes = getRandom(step) let j = step while (j--) { id += alphabet[bytes[j] & mask] || '' if (id.length === size) return id } } } } let customAlphabet = (alphabet, size = 21) => customRandom(alphabet, size, random) let nanoid = (size = 21) => crypto.getRandomValues(new Uint8Array(size)).reduce((id, byte) => { byte &= 63 if (byte < 36) { id += byte.toString(36) } else if (byte < 62) { id += (byte - 26).toString(36).toUpperCase() } else if (byte > 62) { id += '-' } else { id += '_' } return id }, '') module.exports = { nanoid, customAlphabet, customRandom, urlAlphabet, random }