(1)(a) Subject to (b) of this subsection, this chapter displaces conflicting tort, restitutionary, contract, including contract principles relating to discharge by assent or alteration, and other laws of this state pertaining to liability for competition by employees or independent contractors with their employers or principals, as appropriate.

(b) This chapter does not amend or modify chapter 19.108 RCW.

(2) Except as otherwise provided in this chapter, this chapter does not revoke, modify, or impede the development of the common law.