ExposeStaticMethod.ts

export class RSCWorkflow { 
    private static MAX_LENGTH: number = 200;
    
    //... more code

    public validate(packet: Packet): void {
        if (packet.getOriginator() === "MIA" 
            || packet.getLength() > RSCWorkflow.MAX_LENGTH
            || !packet.hasValidCheckSum()) {
            throw new InvalidFlowException();
        }
        //... more code that does not use any instance data or methods    
    }
    
    //... more code
}

//////////////////////////////////////////////

export class RSCWorkflow { 
    private static MAX_LENGTH: number = 200;
    
    //... more code

    //!! we made it static for testing :(
    public static validate(packet: Packet): void {
        if (packet.getOriginator() === "MIA" 
            || packet.getLength() > RSCWorkflow.MAX_LENGTH
            || !packet.hasValidCheckSum()) {
            throw new InvalidFlowException();
        }
        //... more code that does not use instance data or methods    
    }
    
    //... more code
}