[Fix] prop-types: avoid further crashes from nonexistent nodes in unusedPropTypes

Fixes jsx-eslint#2127

Author: ljharb

lib/rules/prop-types.js

@@ -163,17 +163,18 @@ module.exports = {
      * @param {Object} component The component to process
      */
     function reportUndeclaredPropTypes(component) {
-      let allNames;
       for (let i = 0, j = component.usedPropTypes.length; i < j; i++) {
-        allNames = component.usedPropTypes[i].allNames;
+        const allNames = component.usedPropTypes[i].allNames;
+        const node = component.usedPropTypes[i].node;
         if (
           isIgnored(allNames[0]) ||
-          isDeclaredInComponent(component.node, allNames)
+          isDeclaredInComponent(component.node, allNames) ||
+          !node
         ) {
           continue;
         }
         context.report(
-          component.usedPropTypes[i].node,
+          node,
           MISSING_MESSAGE, {
             name: allNames.join('.').replace(/\.__COMPUTED_PROP__/g, '[]')
           }

tests/lib/rules/prop-types.js

@@ -4379,6 +4379,21 @@ ruleTester.run('prop-types', rule, {
       errors: [{
         message: '\'usedProp\' is missing in props validation'
       }]
+    },
+    {
+      code: `
+        export default class Controller extends React.Component {
+          handleAdd = id => {
+            this.setState((state, { name }) => {
+                const item = this.buildItem(id);
+            });
+          };
+        }
+      `,
+      parser: 'babel-eslint',
+      errors: [{
+        message: '\'name\' is missing in props validation'
+      }]
     }
   ]
 });