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Choreographic models support a correctness-by-construction principle indistributed programming. Also, they enable the automatic generation of correctmessage-based communication patterns from a global specification of the desiredsystem behaviour. In this paper we extend the theory of choreography automata,a choreographic model based on finite-state automata, with two key features.First, we allow participants to act only in some of the scenarios described bythe choreography automaton. While this seems natural, many choreographicapproaches in the literature, and choreography automata in particular, forbidthis behaviour. Second, we equip communications with assertions constrainingthe values that can be communicated, enabling a design-by-contract approach. Weprovide a toolchain allowing to exploit the theory above to generate APIs forTypeScript web programming. Programs communicating via the generated APIsfollow, by construction, the prescribed communication pattern and are free fromcommunication errors such as deadlocks.

Design-by-Contract for Flexible Multiparty Session Protocols -- Extended Version