[gdevenyi]

Summary

Closes #127. Uses exclusiveOptions from DouglasNeuroInformatics/libui-form-types#23 (^1.6.0).

 isOptionDisabled(option)
+  if option is selected and exclusive
+    return false            # the user can always deselect it
+  return a different selected option is exclusive

 on(click option)
   if option is selected
     remove option
+  else if isOptionDisabled(option)
+    do nothing
+  else if option is exclusive
+    value = { option }      # deselects all other options
   else
     add option

 <SetField>
+  isOptionDisabled()
   <SetFieldListbox>
-    <Checkbox disabled={disabled || readOnly} />
+    <Checkbox disabled={disabled || readOnly || isOptionDisabled(option)} />
   <SetFieldSelect>
-    <DropdownMenu.CheckboxItem />
+    <DropdownMenu.CheckboxItem disabled={isOptionDisabled(option)} />

• Open question in the issue: Option 1. A click on an exclusive option deselects the other options.
• Values set from outside (for example initialValues) are not changed. The validation schema must enforce the rule if it is necessary.
• Deviation from the literal rule in the issue: a selected exclusive option stays enabled. If two exclusive options are set from outside, the user can still deselect them.
• New stories: WithExclusiveOption and SelectWithExclusiveOption.

Evidence

• Before: with exclusiveOptions ignored in SetField.tsx, 9 of the 84 tests in src/components/Form fail (the new SetField.spec.tsx cases and the new Form.test.tsx case).
  After: pnpm lint passes. pnpm test: 42 files, 246 tests pass.

SetField.spec.tsx (listbox and select)
  select C (exclusive)        -> A, B, D disabled; click on A does nothing
  deselect C                  -> A, B, D enabled
  A, B selected, click C      -> value = { C }
  C, D exclusive              -> each one disables the other
  initial value { A, C }      -> not changed; deselect C gives { A }
  disabled / readOnly         -> all options disabled
Form.test.tsx
  exclusiveOptions in content -> reaches the field; submit gives Set { 'none' }

The checks ran on Node 26; engines asks for Node 24.x.

Merge Danger

Door: two-way

exclusiveOptions is optional. Fields without it behave as before. A revert removes the feature and has no effect on stored data.

Blast Radius: small

Only set fields that set exclusiveOptions change. The rule is enforced in the UI only.

🤖 Generated with Claude Code

https://claude.ai/code/session_01W53iUSBaRj1XfMJBUUzmod

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🎉 This PR is included in version 6.20.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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