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