fix jsx-eslint#884

Author: marcgrr

lib/rules/no-unused-prop-types.js

@@ -10,12 +10,6 @@
 var Components = require('../util/Components');
 var variable = require('../util/variable');
 
-// ------------------------------------------------------------------------------
-// Constants
-// ------------------------------------------------------------------------------
-
-var DIRECT_PROPS_REGEX = /^props\s*(\.|\[)/;
-
 // ------------------------------------------------------------------------------
 // Rule Definition
 // ------------------------------------------------------------------------------
@@ -74,17 +68,15 @@ module.exports = {
     }
 
     /**
-     * Checks if we are using a prop
+     * Checks if this node is `this.props`.
      * @param {ASTNode} node The AST node being checked.
-     * @returns {Boolean} True if we are using a prop, false if not.
+     * @returns {Boolean} True if this node is `this.props`, false if not.
      */
-    function isPropTypesUsage(node) {
-      var isClassUsage = (
+    function isPropsMemberExpression(node) {
+      return (
         (utils.getParentES6Component() || utils.getParentES5Component()) &&
         node.object.type === 'ThisExpression' && node.property.name === 'props'
       );
-      var isStatelessFunctionUsage = node.object.name === 'props';
-      return isClassUsage || isStatelessFunctionUsage;
     }
 
     /**
@@ -209,15 +201,26 @@ module.exports = {
     }
 
     /**
-     * Checks if a prop init name matches common naming patterns
+     * Checks if a node is an identifier referring to props
      * @param {ASTNode} node The AST node being checked.
      * @returns {Boolean} True if the prop name matches
      */
-    function isPropAttributeName (node) {
+    function isPropsIdentifier (node) {
       return (
-        node.init.name === 'props' ||
-        node.init.name === 'nextProps' ||
-        node.init.name === 'prevProps'
+        node.type === 'Identifier' && (
+          node.parent.type === 'MemberExpression' ||
+          node.parent.type === 'VariableDeclarator'
+        ) && (
+          (
+            (isInLifeCycleMethod(node) || utils.getParentStatelessComponent()) &&
+            node.name === 'props'
+          ) || (
+            isInLifeCycleMethod(node) && (
+              node.name === 'nextProps' ||
+              node.name === 'prevProps'
+            )
+          )
+        )
       );
     }
 
@@ -483,41 +486,17 @@ module.exports = {
       }
     }
 
-    /**
-     * Check if we are in a class constructor
-     * @return {boolean} true if we are in a class constructor, false if not
-     */
-    function inConstructor() {
-      var scope = context.getScope();
-      while (scope) {
-        if (scope.block && scope.block.parent && scope.block.parent.kind === 'constructor') {
-          return true;
-        }
-        scope = scope.upper;
-      }
-      return false;
-    }
-
     /**
      * Retrieve the name of a property node
      * @param {ASTNode} node The AST node with the property.
      * @return {string} the name of the property or undefined if not found
      */
     function getPropertyName(node) {
-      var isDirectProp = DIRECT_PROPS_REGEX.test(sourceCode.getText(node));
-      var isInClassComponent = utils.getParentES6Component() || utils.getParentES5Component();
-      var isNotInConstructor = !inConstructor(node);
-      if (isDirectProp && isInClassComponent && isNotInConstructor) {
-        return void 0;
-      }
-      if (!isDirectProp) {
-        node = node.parent;
-      }
-      var property = node.property;
+      var property = node.parent.property;
       if (property) {
         switch (property.type) {
           case 'Identifier':
-            if (node.computed) {
+            if (node.parent.computed) {
               return '__COMPUTED_PROP__';
             }
             return property.name;
@@ -530,7 +509,7 @@ module.exports = {
             }
             // falls through
           default:
-            if (node.computed) {
+            if (node.parent.computed) {
               return '__COMPUTED_PROP__';
             }
             break;
@@ -550,6 +529,7 @@ module.exports = {
       var allNames;
       var properties;
       switch (node.type) {
+        case 'Identifier':
         case 'MemberExpression':
           name = getPropertyName(node);
           if (name) {
@@ -582,16 +562,9 @@ module.exports = {
               (node.id.properties[i].key.name === 'props' || node.id.properties[i].key.value === 'props') &&
               node.id.properties[i].value.type === 'ObjectPattern'
             );
-            // let {firstname} = props
-            var genericDestructuring = isPropAttributeName(node) && (
-                utils.getParentStatelessComponent() ||
-                isInLifeCycleMethod(node)
-            );
 
             if (thisDestructuring) {
               properties = node.id.properties[i].value.properties;
-            } else if (genericDestructuring) {
-              properties = node.id.properties;
             } else {
               continue;
             }
@@ -828,13 +801,8 @@ module.exports = {
         var destructuring = node.init && node.id && node.id.type === 'ObjectPattern';
         // let {props: {firstname}} = this
         var thisDestructuring = destructuring && node.init.type === 'ThisExpression';
-        // let {firstname} = props
-        var statelessDestructuring = destructuring && isPropAttributeName(node) && (
-            utils.getParentStatelessComponent() ||
-            isInLifeCycleMethod(node)
-        );
 
-        if (!thisDestructuring && !statelessDestructuring) {
+        if (!thisDestructuring) {
           return;
         }
         markPropTypesAsUsed(node);
@@ -848,7 +816,7 @@ module.exports = {
 
       MemberExpression: function(node) {
         var type;
-        if (isPropTypesUsage(node)) {
+        if (isPropsMemberExpression(node)) {
           type = 'usage';
         } else if (isPropTypesDeclaration(node.property)) {
           type = 'declaration';
@@ -870,6 +838,12 @@ module.exports = {
         }
       },
 
+      Identifier: function(node) {
+        if (isPropsIdentifier(node)) {
+          markPropTypesAsUsed(node);
+        }
+      },
+
       MethodDefinition: function(node) {
         if (!isPropTypesDeclaration(node.key)) {
           return;

lib/util/Components.js

@@ -347,12 +347,12 @@ function componentRule(rule, context) {
         var isFunction = /Function/.test(node.type); // Functions
         var isMethod = node.parent && node.parent.type === 'MethodDefinition'; // Classes methods
         var isArgument = node.parent && node.parent.type === 'CallExpression'; // Arguments (callback, etc.)
-        // Stop moving up if we reach a class or an argument (like a callback)
-        if (isClass || isArgument) {
+        // Stop moving up if we reach a class
+        if (isClass) {
           return null;
         }
-        // Return the node if it is a function that is not a class method
-        if (isFunction && !isMethod) {
+        // Return the node if it is a function that is not a class method and not a callback argument
+        if (isFunction && !isMethod && !isArgument) {
           return node;
         }
         scope = scope.upper;