uid-promise/lib/esm/uid.js

generates a cryptographically strong random uid

// the file extension is needed for ESM
import { UIDCHARS } from './chars.js';
export const generateUidFunction = (randomBytes) => (len) => new Promise(async (resolve, reject) => {
    if (!Number.isInteger(len)) {
        reject(new TypeError('You must supply a length integer to `uid-promise`.'));
        return;
    }
    if (len <= 0) {
        reject(new Error('You must supply a length integer greater than zero'));
        return;
    }
    randomBytes(len, (err, buf) => {
        if (err) {
            return reject(err);
        }
        const str = [];
        let rand;
        for (let i = 0; i < buf.length; i++) {
            rand = buf[i];
            while (rand > 248) {
                try {
                    rand = randomBytes(1)[0];
                }
                catch (err) {
                    reject(err);
                }
            }
            str.push(UIDCHARS[rand % UIDCHARS.length]);
        }
        resolve(str.join(''));
    });
});