fix: not-null check for hooks

Author: clarkdo

lib/rules/no-env-in-mounted.js

@@ -47,16 +47,18 @@ module.exports = {
       ...utils.executeOnVue(context, obj => {
         for (const funcName of HOOKS) {
           const func = utils.getFunctionWithName(obj, funcName)
-          for (const { name, node: child } of forbiddenNodes) {
-            if (utils.isInFunction(func, child)) {
-              context.report({
-                node: child,
-                messageId: 'noEnv',
-                data: {
-                  name,
-                  funcName
-                }
-              })
+          if (func) {
+            for (const { name, node: child } of forbiddenNodes) {
+              if (utils.isInFunction(func, child)) {
+                context.report({
+                  node: child,
+                  messageId: 'noEnv',
+                  data: {
+                    name,
+                    funcName
+                  }
+                })
+              }
             }
           }
         }