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import { urlAlphabet } from './url-alphabet/index.js' | |
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 | |
}, '') | |
export { nanoid, customAlphabet, customRandom, urlAlphabet, random } | |