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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 } | |