core

Core package for schema definition, catalog creation, and spec streaming. For streaming AI responses (JSONL patches): Any prop value can be a dynamic expression resolved at render time: $cond uses the same syntax as visibility conditions ( $state , eq , neq , not , arrays for AND). $then and $else can themselves be expressions (recursive). Components do not use a statePath prop for two-way binding. Instead, use { "$bindState": "/path" } on the natural value prop (e.g. value , checked , pressed ). Elements can declare a watch field (top-level, sibling of type/props/children) to trigger actions when state values change: Watchers only fire on value changes, not on initial render. Built-in validation functions: required , email , url , numeric , minLength , maxLength , min , max , pattern , matches , equalTo , lessThan , greaterThan , requiredIf . Cross-field validation uses $state expressions in args: Build structured user prompts with optional spec refinement and state context: Available edit modes: "patch" (RFC 6902 JSON Patch), "merge" (RFC 7396 Merge Patch), "diff" (unified diff). Validate spec structure and auto-fix common issues: Control element visibility with state-based conditions.