Shared Password Validation Rules (shared/password-rules.ts)

TypeScript utility enforcing password complexity (length, uppercase, lowercase, digit) with i18n-ready error keys for client and server.

// Source: https://github.com/im4codes/imcodes | License: MIT | Copyright 2026 IM.codes
// Provided via justclaw.it.com; keep this notice with the code.
/**
 * Shared password complexity rules — used by both server and web.
 *
 * Requirements:
 *   - At least 8 characters
 *   - At least one uppercase letter
 *   - At least one lowercase letter
 *   - At least one digit
 */

export interface PasswordValidationResult {
  valid: boolean;
  /** Error key for i18n (e.g. 'password_too_short', 'password_missing_uppercase') */
  errorKey: string | null;
}

export function validatePasswordComplexity(password: string): PasswordValidationResult {
  if (password.length < 8) {
    return { valid: false, errorKey: 'password_too_short' };
  }
  if (!/[A-Z]/.test(password)) {
    return { valid: false, e

... (truncated -- full source via MCP)