Token Service with refreshing

TokenService.ts

export class TokenService {
  private static jwt_secret = process.env.JWT_SECRET!;

  public static refreshConfig = () => {
    this.jwt_secret = process.env.JWT_SECRET!;
    if (!this.jwt_secret) {
      throw new Error('JWT secret not found in environment variables!');
    }
  };

  // our verify and sign methods will be the same
}