diff --git a/lib/rules/define-props-declaration.js b/lib/rules/define-props-declaration.js
index 39494bd94..47d927dde 100644
--- a/lib/rules/define-props-declaration.js
+++ b/lib/rules/define-props-declaration.js
@@ -14,8 +14,7 @@ const mapNativeType = (/** @type {string} */ nativeType) => {
     case 'Number': {
       return 'number'
     }
-    case 'Boolean':
-    case 'BigInt': {
+    case 'Boolean': {
       return 'boolean'
     }
     case 'Object': {
@@ -41,26 +40,19 @@ const mapNativeType = (/** @type {string} */ nativeType) => {
  * @param {SourceCode} sourceCode
  */
 function getComponentPropData(prop, sourceCode) {
-  const unknownType = {
-    name: prop.propName,
-    type: 'unknown',
-    required: undefined,
-    defaultValue: undefined
-  }
-
   if (prop.type !== 'object') {
-    return unknownType
+    throw new Error(`Unexpected prop type: ${prop.type}.`)
   }
   const type = optionGetType(prop.value, sourceCode)
   if (type === null) {
-    return unknownType
+    throw new Error(`Unexpected prop type: ${prop.type}.`)
   }
   const required = optionGetRequired(prop.value)
   const defaultValue = optionGetDefault(prop.value)
 
   return {
     name: prop.propName,
-    type: mapNativeType(type),
+    type,
     required,
     defaultValue
   }
@@ -74,7 +66,7 @@ function getComponentPropData(prop, sourceCode) {
 function optionGetType(node, sourceCode) {
   switch (node.type) {
     case 'Identifier': {
-      return node.name
+      return mapNativeType(node.name)
     }
     case 'ObjectExpression': {
       // foo: {
@@ -107,7 +99,17 @@ function optionGetType(node, sourceCode) {
       return optionGetType(typeProperty.value, sourceCode)
     }
     case 'ArrayExpression': {
-      return null
+      return node.elements
+        .map((element) => {
+          // TODO handle SpreadElement
+          if (element === null || element.type === 'SpreadElement') {
+            return null
+          }
+
+          return optionGetType(element, sourceCode)
+        })
+        .filter(Boolean)
+        .join(' | ')
     }
     case 'FunctionExpression':
     case 'ArrowFunctionExpression': {
@@ -217,7 +219,9 @@ module.exports = {
                   const definePropsType = `{ ${propTypes
                     .map(
                       ({ name, type, required, defaultValue }) =>
-                        `${name}${required === false || defaultValue ? '?' : ''}: ${type}`
+                        `${name}${
+                          required === false || defaultValue ? '?' : ''
+                        }: ${type}`
                     )
                     .join(', ')} }`
 
@@ -227,7 +231,9 @@ module.exports = {
                   // add type annotation
                   if (separateInterface) {
                     const variableDeclarationNode = node.parent.parent
-                    if (!variableDeclarationNode) return
+                    if (!variableDeclarationNode) {
+                      return
+                    }
 
                     yield fixer.insertTextBefore(
                       variableDeclarationNode,
diff --git a/tests/lib/rules/define-props-declaration.js b/tests/lib/rules/define-props-declaration.js
index dd98c3a2f..caf822193 100644
--- a/tests/lib/rules/define-props-declaration.js
+++ b/tests/lib/rules/define-props-declaration.js
@@ -564,6 +564,31 @@ tester.run('define-props-declaration', rule, {
         }
       ]
     },
+    // Array of types
+    {
+      only: true,
+      filename: 'test.vue',
+      code: `
+        <script setup lang="ts">
+        const props = defineProps({
+          kind: {
+            type: [String, Number]
+          }
+        })
+        </script>
+      `,
+      output: `
+        <script setup lang="ts">
+        const props = defineProps<{ kind: string | number }>()
+        </script>
+      `,
+      errors: [
+        {
+          message: 'Use type-based declaration instead of runtime declaration.',
+          line: 3
+        }
+      ]
+    },
     // runtime
     {
       filename: 'test.vue',