Open the context
Choose the project folder and name the files or behavior involved.
Workflows
Coding workflows · Hierarchical interfaces
03
A concrete starting point
Expand and collapse a hierarchy without losing the selected item. Check nested parents and keyboard focus when a branch containing that item becomes hidden.
Define the change
Describe the input, expected output and boundaries that must stay intact.
Inspect the work
Review the proposed edits and any commands before relying on their result.
Check the outcome
Compare actual behavior with the expected result. If a check fails, investigate it before applying more changes.
Hierarchical interfaces
A concrete starting point
const expanded = new Set(state.expanded);
expanded.has(nodeId)
? expanded.delete(nodeId) : expanded.add(nodeId);
return { ...state, expanded };The example is a starting point for a real project, not a claim that generated code is already tested. Adjust paths, dependencies and expected behavior to match your application.