Fix false positives for script setup with ts literal type in vue/require-valid-default-prop (#1854)

* Fix false positives for script setup with ts literal type in `vue/require-valid-default-prop`

* remove dupe test

* Add testcase

* Update tests/lib/rules/require-valid-default-prop.js

Co-authored-by: Flo Edelmann <florian-edelmann@online.de>

Co-authored-by: Flo Edelmann <florian-edelmann@online.de>

Author: ota-meshi

lib/utils/ts-ast-utils.js

@@ -260,23 +260,21 @@ function inferRuntimeType(context, node, checked = new Set()) {
       return ['Array']
 
     case 'TSLiteralType':
-      switch (node.literal.type) {
-        //@ts-ignore ?
-        case 'StringLiteral':
-          return ['String']
-        //@ts-ignore ?
-        case 'BooleanLiteral':
-          return ['Boolean']
-        //@ts-ignore ?
-        case 'NumericLiteral':
-        //@ts-ignore ?
-        // eslint-disable-next-line no-fallthrough
-        case 'BigIntLiteral':
-          return ['Number']
-        default:
-          return [`null`]
+      if (node.literal.type === 'Literal') {
+        switch (typeof node.literal.value) {
+          case 'boolean':
+            return ['Boolean']
+          case 'string':
+            return ['String']
+          case 'number':
+          case 'bigint':
+            return ['Number']
+        }
+        if (node.literal.value instanceof RegExp) {
+          return ['RegExp']
+        }
       }
-
+      return [`null`]
     case 'TSTypeReference':
       if (node.typeName.type === 'Identifier') {
         const variable = findVariable(context.getScope(), node.typeName.name)

tests/lib/rules/require-valid-default-prop.js

@@ -252,6 +252,29 @@ ruleTester.run('require-valid-default-prop', rule, {
       parserOptions: { ecmaVersion: 6, sourceType: 'module' },
       parser: require.resolve('@typescript-eslint/parser'),
       errors: errorMessage('function')
+    },
+    {
+      // https://github.com/vuejs/eslint-plugin-vue/issues/1853
+      filename: 'test.vue',
+      code: `<script setup lang="ts">
+      export interface SomePropInterface {
+        someProp?: false | string;
+        str?: 'foo' | 'bar';
+        num?: 1 | 2;
+      }
+
+      withDefaults(defineProps<SomePropInterface>(), {
+        someProp: false,
+        str: 'foo',
+        num: 1
+      });
+      </script>`,
+      parserOptions: {
+        ecmaVersion: 6,
+        sourceType: 'module',
+        parser: require.resolve('@typescript-eslint/parser')
+      },
+      parser: require.resolve('vue-eslint-parser')
     }
   ],