Accept executes the flow to the deepest using input.

FindMilestoneInCurrentFlow find the last milestone in the flow.

InstantiateFlow is used by the HTTP layer to instantiate a Flow.

RegisterFlow is for registering a flow.

TraverseFlow traverse the flow, and intent of the flow is treated as the last node of the flow.

TraverseFlowIntentFirst is same as TraverseFlow, except that it ensures all nodes and intents must be traversed in the order they are inserted to the flow i.e.

EventKindRefresh indicates client should re-fetch current state of flow for updated state.

ErrEOF means end of flow.

ErrIncompatibleInput means the input reactor cannot react to the input.

ErrNoChange means the input does not cause the flow to change.

ErrSameNode means the input is reacted to, but no node is produced.

ErrUpdateNode means the input is reacted to, but instead of producing a new node to be appended, the returned node should replace the node.

ErrorBotProtectionVerification is a special error for interrupting the flow in case of failed or service-unavailable.

ErrorRewriteFlow is a special error for rewriting the flow.

ErrorSwitchFlow is a special error for switching flow.

FlowAction is an API object.

FlowAllowlist contains union of flow group and flow allowlist.

FlowReference is an API object.

FlowResponse is an API object.

Session must not contain web session ID.

Data is a marker.

DataOutputer is an InputReactor.

EndOfFlowDataOutputer is an optional interface to be implemented by PublicFlow.

Input is a marker to signify some struct is an Input.

InputReactor, if can react to some input, must return an InputSchema.

InputSchema validates and parses the input.

InputUnwrapper is for advanced usage.

Milestone is a marker.

PublicFlow is a instantiable intent by the public.

FlowType denotes the type of the intents.