Fixed tsc error

Author: ota-meshi

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

@@ -116,16 +116,6 @@ module.exports = {
      * @type {ScopeStack | null}
      */
     let scopeStack = null
-    /**
-     * @param {FunctionExpression | FunctionDeclaration | ArrowFunctionExpression} node
-     */
-    function onFunctionEnter(node) {
-      scopeStack = {
-        upper: scopeStack,
-        body: node.body,
-        returnTypes: null
-      }
-    }
 
     function onFunctionExit() {
       scopeStack = scopeStack && scopeStack.upper
@@ -300,7 +290,11 @@ module.exports = {
        * @param {VueObjectData} data
        */
       ':function'(node, { node: vueNode }) {
-        onFunctionEnter(node)
+        scopeStack = {
+          upper: scopeStack,
+          body: node.body,
+          returnTypes: null
+        }
 
         const data = vueObjectPropsContexts.get(vueNode)
         if (!data) {
@@ -317,6 +311,9 @@ module.exports = {
        * @param {ReturnStatement} node
        */
       ReturnStatement(node) {
+        if (!scopeStack) {
+          return
+        }
         if (scopeStack.returnTypes && node.argument) {
           const type = getValueType(node.argument)
           if (type) {