Clean up the oopsie. Rebuild the blank exercises.

node_modules/estraverse/estraverse.js

@@ -29,24 +29,12 @@
     'use strict';
 
     var Syntax,
-        isArray,
         VisitorOption,
         VisitorKeys,
-        objectCreate,
-        objectKeys,
         BREAK,
         SKIP,
         REMOVE;
 
-    function ignoreJSHintError() { }
-
-    isArray = Array.isArray;
-    if (!isArray) {
-        isArray = function isArray(array) {
-            return Object.prototype.toString.call(array) === '[object Array]';
-        };
-    }
-
     function deepCopy(obj) {
         var ret = {}, key, val;
         for (key in obj) {
@@ -62,17 +50,6 @@
         return ret;
     }
 
-    function shallowCopy(obj) {
-        var ret = {}, key;
-        for (key in obj) {
-            if (obj.hasOwnProperty(key)) {
-                ret[key] = obj[key];
-            }
-        }
-        return ret;
-    }
-    ignoreJSHintError(shallowCopy);
-
     // based on LLVM libc++ upper_bound / lower_bound
     // MIT License
 
@@ -95,52 +72,6 @@
         return i;
     }
 
-    function lowerBound(array, func) {
-        var diff, len, i, current;
-
-        len = array.length;
-        i = 0;
-
-        while (len) {
-            diff = len >>> 1;
-            current = i + diff;
-            if (func(array[current])) {
-                i = current + 1;
-                len -= diff + 1;
-            } else {
-                len = diff;
-            }
-        }
-        return i;
-    }
-    ignoreJSHintError(lowerBound);
-
-    objectCreate = Object.create || (function () {
-        function F() { }
-
-        return function (o) {
-            F.prototype = o;
-            return new F();
-        };
-    })();
-
-    objectKeys = Object.keys || function (o) {
-        var keys = [], key;
-        for (key in o) {
-            keys.push(key);
-        }
-        return keys;
-    };
-
-    function extend(to, from) {
-        var keys = objectKeys(from), key, i, len;
-        for (i = 0, len = keys.length; i < len; i += 1) {
-            key = keys[i];
-            to[key] = from[key];
-        }
-        return to;
-    }
-
     Syntax = {
         AssignmentExpression: 'AssignmentExpression',
         AssignmentPattern: 'AssignmentPattern',
@@ -153,6 +84,7 @@
         BreakStatement: 'BreakStatement',
         CallExpression: 'CallExpression',
         CatchClause: 'CatchClause',
+        ChainExpression: 'ChainExpression',
         ClassBody: 'ClassBody',
         ClassDeclaration: 'ClassDeclaration',
         ClassExpression: 'ClassExpression',
@@ -177,6 +109,7 @@
         GeneratorExpression: 'GeneratorExpression',  // CAUTION: It's deferred to ES7.
         Identifier: 'Identifier',
         IfStatement: 'IfStatement',
+        ImportExpression: 'ImportExpression',
         ImportDeclaration: 'ImportDeclaration',
         ImportDefaultSpecifier: 'ImportDefaultSpecifier',
         ImportNamespaceSpecifier: 'ImportNamespaceSpecifier',
@@ -227,6 +160,7 @@
         BreakStatement: ['label'],
         CallExpression: ['callee', 'arguments'],
         CatchClause: ['param', 'body'],
+        ChainExpression: ['expression'],
         ClassBody: ['body'],
         ClassDeclaration: ['id', 'superClass', 'body'],
         ClassExpression: ['id', 'superClass', 'body'],
@@ -251,6 +185,7 @@
         GeneratorExpression: ['blocks', 'filter', 'body'],  // CAUTION: It's deferred to ES7.
         Identifier: [],
         IfStatement: ['test', 'consequent', 'alternate'],
+        ImportExpression: ['source'],
         ImportDeclaration: ['specifiers', 'source'],
         ImportDefaultSpecifier: ['local'],
         ImportNamespaceSpecifier: ['local'],
@@ -310,7 +245,7 @@
     };
 
     Reference.prototype.remove = function remove() {
-        if (isArray(this.parent)) {
+        if (Array.isArray(this.parent)) {
             this.parent.splice(this.key, 1);
             return true;
         } else {
@@ -334,7 +269,7 @@
         var i, iz, j, jz, result, element;
 
         function addToPath(result, path) {
-            if (isArray(path)) {
+            if (Array.isArray(path)) {
                 for (j = 0, jz = path.length; j < jz; ++j) {
                     result.push(path[j]);
                 }
@@ -434,14 +369,14 @@
         this.__state = null;
         this.__fallback = null;
         if (visitor.fallback === 'iteration') {
-            this.__fallback = objectKeys;
+            this.__fallback = Object.keys;
         } else if (typeof visitor.fallback === 'function') {
             this.__fallback = visitor.fallback;
         }
 
         this.__keys = VisitorKeys;
         if (visitor.keys) {
-            this.__keys = extend(objectCreate(this.__keys), visitor.keys);
+            this.__keys = Object.assign(Object.create(this.__keys), visitor.keys);
         }
     };
 
@@ -455,6 +390,15 @@
     function isProperty(nodeType, key) {
         return (nodeType === Syntax.ObjectExpression || nodeType === Syntax.ObjectPattern) && 'properties' === key;
     }
+  
+    function candidateExistsInLeaveList(leavelist, candidate) {
+        for (var i = leavelist.length - 1; i >= 0; --i) {
+            if (leavelist[i].node === candidate) {
+                return true;
+            }
+        }
+        return false;
+    }
 
     Controller.prototype.traverse = function traverse(root, visitor) {
         var worklist,
@@ -530,12 +474,17 @@
                         continue;
                     }
 
-                    if (isArray(candidate)) {
+                    if (Array.isArray(candidate)) {
                         current2 = candidate.length;
                         while ((current2 -= 1) >= 0) {
                             if (!candidate[current2]) {
                                 continue;
                             }
+
+                            if (candidateExistsInLeaveList(leavelist, candidate[current2])) {
+                              continue;
+                            }
+
                             if (isProperty(nodeType, candidates[current])) {
                                 element = new Element(candidate[current2], [key, current2], 'Property', null);
                             } else if (isNode(candidate[current2])) {
@@ -546,6 +495,10 @@
                             worklist.push(element);
                         }
                     } else if (isNode(candidate)) {
+                        if (candidateExistsInLeaveList(leavelist, candidate)) {
+                          continue;
+                        }
+
                         worklist.push(new Element(candidate, key, null, null));
                     }
                 }
@@ -684,7 +637,7 @@
                     continue;
                 }
 
-                if (isArray(candidate)) {
+                if (Array.isArray(candidate)) {
                     current2 = candidate.length;
                     while ((current2 -= 1) >= 0) {
                         if (!candidate[current2]) {
@@ -834,7 +787,6 @@
         return tree;
     }
 
-    exports.version = require('./package.json').version;
     exports.Syntax = Syntax;
     exports.traverse = traverse;
     exports.replace = replace;