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Add StepValidateFn type, onStepValidate option, stepValidating state, and nextStepAsync() method. Enables server-side validation between steps without UX glitches. Includes try/finally for exception safety, stale-step guard, and smart error routing to topLevelErrors.
Pass onStepValidate into engine options, make handleNext/onNext async via nextStepAsync(), merge stepValidating into loading state for the Continue button. Add stepValidating to Vue composable return type.
Add 13 tests for nextStepAsync covering sync fallback, error blocking, concurrent call rejection, exception recovery, stale-step discard, and topLevelErrors routing. Update React multi-step tests to use waitFor for async handleNext.
Add onStepValidate section to steps guide with React/Vue examples, update validation timing docs, add async error handling section, and document StepValidateFn type and stepValidating property in API reference.
Reset stepValidating before _notify() in each exit path instead of using a finally block. Reduces re-renders from 2 to 1 per step advance.
Reset errors and topLevelErrors before processing onStepValidate return value. Prevents stale errors from previous attempts accumulating across retries.
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Summary
onStepValidatecallback: async validation that runs between steps,after sync validation passes, but before the transition. Enables server-side
checks without the visual glitch of advancing and snapping back.
nextStepAsync()method on FormEngine,stepValidatingstate property.state automatically during async validation.