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skills/vue-best-practices/reference/prop-boolean-casting-order.md

@@ -0,0 +1,104 @@
+---
+title: Boolean Prop Type Order Affects Casting Behavior
+impact: MEDIUM
+impactDescription: Wrong type order causes boolean props to be parsed as empty strings instead of true
+type: gotcha
+tags: [vue3, props, boolean, type-casting, validation]
+---
+
+# Boolean Prop Type Order Affects Casting Behavior
+
+**Impact: MEDIUM** - When a prop accepts multiple types including both `Boolean` and `String`, the order in the type array determines how attribute-only syntax (e.g., `<Component disabled />`) is parsed. Incorrect ordering can result in `""` (empty string) instead of `true`.
+
+Vue applies special boolean casting rules, but String appearing before Boolean disables this casting.
+
+## Task Checklist
+
+- [ ] Place `Boolean` before `String` in type arrays when you want boolean casting
+- [ ] Test attribute-only syntax (`<Component disabled />`) to verify expected behavior
+- [ ] Consider using only `Boolean` type if the prop is truly boolean
+- [ ] Document the expected usage if both String and Boolean are intentional
+
+**Incorrect:**
+```vue
+<script setup>
+// WRONG: String before Boolean disables boolean casting
+defineProps({
+  disabled: [String, Boolean]  // disabled="" is parsed as empty string ""
+})
+</script>
+
+<!-- In parent template -->
+<MyComponent disabled />  <!-- props.disabled === "" (empty string, not true!) -->
+```
+
+```vue
+<script setup>
+defineProps({
+  // PROBLEMATIC: Order matters and may cause confusion
+  loading: [String, Boolean],  // <Component loading /> gives ""
+  active: [Boolean, String]    // <Component active /> gives true
+})
+</script>
+```
+
+**Correct:**
+```vue
+<script setup>
+// CORRECT: Boolean before String enables boolean casting
+defineProps({
+  disabled: [Boolean, String]  // <Component disabled /> parsed as true
+})
+</script>
+
+<!-- All of these work as expected -->
+<MyComponent disabled />           <!-- props.disabled === true -->
+<MyComponent :disabled="true" />   <!-- props.disabled === true -->
+<MyComponent :disabled="false" />  <!-- props.disabled === false -->
+<MyComponent disabled="custom" />  <!-- props.disabled === "custom" -->
+```
+
+```vue
+<script setup>
+// BEST: Use only Boolean if you don't need String values
+defineProps({
+  disabled: Boolean  // Clear intent, no ambiguity
+})
+</script>
+```
+
+## Boolean Casting Rules
+
+| Prop Declaration | Template Usage | Resulting Value |
+|-----------------|----------------|-----------------|
+| `Boolean` | `<C disabled />` | `true` |
+| `Boolean` | `<C />` (absent) | `false` |
+| `[Boolean, String]` | `<C disabled />` | `true` |
+| `[String, Boolean]` | `<C disabled />` | `""` (empty string) |
+| `[Boolean, Number]` | `<C disabled />` | `true` |
+| `[Number, Boolean]` | `<C disabled />` | `true` |
+
+Note: The String type is special - it's the only type that overrides Boolean casting when placed first.
+
+## When to Use Multiple Types
+
+```vue
+<script setup>
+// Use case: Prop can be a boolean toggle OR a string configuration
+defineProps({
+  // Animation can be true/false OR a timing string like "fast", "slow"
+  animate: {
+    type: [Boolean, String],  // Boolean first for casting
+    default: false
+  }
+})
+</script>
+
+<!-- Usage examples -->
+<Dialog animate />                <!-- true - use default animation -->
+<Dialog :animate="false" />       <!-- false - no animation -->
+<Dialog animate="slow" />         <!-- "slow" - custom timing -->
+```
+
+## Reference
+- [Vue.js Props - Boolean Casting](https://vuejs.org/guide/components/props.html#boolean-casting)