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TypeScript

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/**
* Generate secure URL-friendly unique ID.
*
* By default, the ID will have 21 symbols to have a collision probability
* similar to UUID v4.
*
* ```js
* import { nanoid } from 'nanoid'
* model.id = nanoid() //=> "Uakgb_J5m9g-0JDMbcJqL"
* ```
*
* @param size Size of the ID. The default size is 21.
* @returns A random string.
*/
export function nanoid(size?: number): string
/**
* Generate secure unique ID with custom alphabet.
*
* Alphabet must contain 256 symbols or less. Otherwise, the generator
* will not be secure.
*
* @param alphabet Alphabet used to generate the ID.
* @param defaultSize Size of the ID. The default size is 21.
* @returns A random string generator.
*
* ```js
* const { customAlphabet } = require('nanoid')
* const nanoid = customAlphabet('0123456789абвгдеё', 5)
* nanoid() //=> "8ё56а"
* ```
*/
export function customAlphabet(
alphabet: string,
defaultSize?: number
): (size?: number) => string
/**
* Generate unique ID with custom random generator and alphabet.
*
* Alphabet must contain 256 symbols or less. Otherwise, the generator
* will not be secure.
*
* ```js
* import { customRandom } from 'nanoid/format'
*
* const nanoid = customRandom('abcdef', 5, size => {
* const random = []
* for (let i = 0; i < size; i++) {
* random.push(randomByte())
* }
* return random
* })
*
* nanoid() //=> "fbaef"
* ```
*
* @param alphabet Alphabet used to generate a random string.
* @param size Size of the random string.
* @param random A random bytes generator.
* @returns A random string generator.
*/
export function customRandom(
alphabet: string,
size: number,
random: (bytes: number) => Uint8Array
): () => string
/**
* URL safe symbols.
*
* ```js
* import { urlAlphabet } from 'nanoid'
* const nanoid = customAlphabet(urlAlphabet, 10)
* nanoid() //=> "Uakgb_J5m9"
* ```
*/
export const urlAlphabet: string
/**
* Generate an array of random bytes collected from hardware noise.
*
* ```js
* import { customRandom, random } from 'nanoid'
* const nanoid = customRandom("abcdef", 5, random)
* ```
*
* @param bytes Size of the array.
* @returns An array of random bytes.
*/
export function random(bytes: number): Uint8Array