import { urlAlphabet } from './url-alphabet/index.js' | |
export { urlAlphabet } from './url-alphabet/index.js' | |
export let random = bytes => crypto.getRandomValues(new Uint8Array(bytes)) | |
export 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 | |
} | |
} | |
} | |
} | |
export let customAlphabet = (alphabet, size = 21) => | |
customRandom(alphabet, size, random) | |
export let nanoid = (size = 21) => { | |
let id = '' | |
let bytes = crypto.getRandomValues(new Uint8Array(size)) | |
while (size--) { | |
id += urlAlphabet[bytes[size] & 63] | |
} | |
return id | |
} | |