Use original implementation

Author: jackyho112

lib/rules/no-unused-state.js

@@ -54,7 +54,7 @@ function getInitialClassInfo() {
     // shadowing, assignments, etc. To keep things simple, we only
     // maintain one set of aliases per method and accept that it will
     // produce some false negatives.
-    aliases: new Set()
+    aliases: null
   };
 }
 
@@ -86,6 +86,7 @@ module.exports = {
 
       const isAliasedStateReference =
         node.type === 'Identifier' &&
+        classInfo.aliases &&
         classInfo.aliases.has(node.name);
 
       return isDirectStateReference || isAliasedStateReference;
@@ -124,7 +125,10 @@ module.exports = {
       for (const prop of node.properties) {
         if (prop.type === 'Property') {
           addUsedStateField(prop.key);
-        } else if (prop.type === 'ExperimentalRestProperty') {
+        } else if (
+          prop.type === 'ExperimentalRestProperty' &&
+          classInfo.aliases
+        ) {
           classInfo.aliases.add(getName(prop.argument));
         }
       }
@@ -135,14 +139,14 @@ module.exports = {
     function handleAssignment(left, right) {
       switch (left.type) {
         case 'Identifier':
-          if (isStateReference(right)) {
+          if (isStateReference(right) && classInfo.aliases) {
             classInfo.aliases.add(left.name);
           }
           break;
         case 'ObjectPattern':
           if (isStateReference(right)) {
             handleStateDestructuring(left);
-          } else if (isThisExpression(right)) {
+          } else if (isThisExpression(right) && classInfo.aliases) {
             for (const prop of left.properties) {
               if (prop.type === 'Property' && getName(prop.key) === 'state') {
                 const name = getName(prop.value);
@@ -244,6 +248,18 @@ module.exports = {
         }
       },
 
+      'ClassProperty:exit'(node) {
+        if (
+          classInfo &&
+          !node.static &&
+          node.value &&
+          node.value.type === 'ArrowFunctionExpression'
+        ) {
+          // Forget our set of local aliases.
+          classInfo.aliases = null;
+        }
+      },
+
       MethodDefinition() {
         if (!classInfo) {
           return;
@@ -252,6 +268,14 @@ module.exports = {
         classInfo.aliases = new Set();
       },
 
+      'MethodDefinition:exit'() {
+        if (!classInfo) {
+          return;
+        }
+        // Forget our set of local aliases.
+        classInfo.aliases = null;
+      },
+
       FunctionExpression(node) {
         if (!classInfo) {
           return;