@backgroundjs/core/src/utils/id-generator.ts

An extendible background job queue for js/ts applications

// src/utils/id-generator.ts

/**
 * Generates a random string of specified length with given character set
 * Compatible with all JavaScript runtimes (Node.js, Deno, Bun, browsers)
 *
 * @param length The length of the ID to generate
 * @param chars Character set to use (defaults to alphanumeric)
 * @returns A random ID string
 */
export function generateId(
  length: number = 21,
  chars: string = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
): string {
  let id = "";
  try {
    // Try to use crypto if available
    const crypto = globalThis.crypto;
    if (crypto?.getRandomValues) {
      const bytes = new Uint8Array(length);
      crypto.getRandomValues(bytes);

      for (let i = 0; i < length; i++) {
        id += chars.charAt(bytes[i] % chars.length);
      }
      return id;
    }
  } catch (e) {
    // Fall back to Math.random if crypto is not available or fails
  }
  // Fallback to Math.random (less secure but works everywhere)
  for (let i = 0; i < length; i++) {
    id += chars.charAt(Math.floor(Math.random() * chars.length));
  }
  return id;
}