Fix.

node_modules/istanbul-lib-report/lib/tree.js

@@ -0,0 +1,159 @@
+/*
+ Copyright 2012-2015, Yahoo Inc.
+ Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
+ */
+'use strict';
+
+const util = require('util');
+/**
+ * An object with methods that are called during the traversal of the coverage tree.
+ * A visitor has the following methods that are called during tree traversal.
+ *
+ *   * `onStart(root, state)` - called before traversal begins
+ *   * `onSummary(node, state)` - called for every summary node
+ *   * `onDetail(node, state)` - called for every detail node
+ *   * `onSummaryEnd(node, state)` - called after all children have been visited for
+ *      a summary node.
+ *   * `onEnd(root, state)` - called after traversal ends
+ *
+ * @param delegate - a partial visitor that only implements the methods of interest
+ *  The visitor object supplies the missing methods as noops. For example, reports
+ *  that only need the final coverage summary need implement `onStart` and nothing
+ *  else. Reports that use only detailed coverage information need implement `onDetail`
+ *  and nothing else.
+ * @constructor
+ */
+function Visitor(delegate) {
+    this.delegate = delegate;
+}
+
+['Start', 'End', 'Summary', 'SummaryEnd', 'Detail'].forEach(k => {
+    const f = 'on' + k;
+    Visitor.prototype[f] = function(node, state) {
+        if (this.delegate[f] && typeof this.delegate[f] === 'function') {
+            this.delegate[f].call(this.delegate, node, state);
+        }
+    };
+});
+
+function CompositeVisitor(visitors) {
+    if (!Array.isArray(visitors)) {
+        visitors = [visitors];
+    }
+    this.visitors = visitors.map(v => {
+        if (v instanceof Visitor) {
+            return v;
+        }
+        return new Visitor(v);
+    });
+}
+
+util.inherits(CompositeVisitor, Visitor);
+
+['Start', 'Summary', 'SummaryEnd', 'Detail', 'End'].forEach(k => {
+    const f = 'on' + k;
+    CompositeVisitor.prototype[f] = function(node, state) {
+        this.visitors.forEach(v => {
+            v[f](node, state);
+        });
+    };
+});
+
+function Node() {}
+
+/* istanbul ignore next: abstract method */
+Node.prototype.getQualifiedName = function() {
+    throw new Error('getQualifiedName must be overridden');
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.getRelativeName = function() {
+    throw new Error('getRelativeName must be overridden');
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.isRoot = function() {
+    return !this.getParent();
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.getParent = function() {
+    throw new Error('getParent must be overridden');
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.getChildren = function() {
+    throw new Error('getChildren must be overridden');
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.isSummary = function() {
+    throw new Error('isSummary must be overridden');
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.getCoverageSummary = function(/* filesOnly */) {
+    throw new Error('getCoverageSummary must be overridden');
+};
+
+/* istanbul ignore next: abstract method */
+Node.prototype.getFileCoverage = function() {
+    throw new Error('getFileCoverage must be overridden');
+};
+/**
+ * visit all nodes depth-first from this node down. Note that `onStart`
+ * and `onEnd` are never called on the visitor even if the current
+ * node is the root of the tree.
+ * @param visitor a full visitor that is called during tree traversal
+ * @param state optional state that is passed around
+ */
+Node.prototype.visit = function(visitor, state) {
+    if (this.isSummary()) {
+        visitor.onSummary(this, state);
+    } else {
+        visitor.onDetail(this, state);
+    }
+
+    this.getChildren().forEach(child => {
+        child.visit(visitor, state);
+    });
+
+    if (this.isSummary()) {
+        visitor.onSummaryEnd(this, state);
+    }
+};
+
+/**
+ * abstract base class for a coverage tree.
+ * @constructor
+ */
+function Tree() {}
+
+/**
+ * returns the root node of the tree
+ */
+/* istanbul ignore next: abstract method */
+Tree.prototype.getRoot = function() {
+    throw new Error('getRoot must be overridden');
+};
+
+/**
+ * visits the tree depth-first with the supplied partial visitor
+ * @param visitor - a potentially partial visitor
+ * @param state - the state to be passed around during tree traversal
+ */
+Tree.prototype.visit = function(visitor, state) {
+    if (!(visitor instanceof Visitor)) {
+        visitor = new Visitor(visitor);
+    }
+    visitor.onStart(this.getRoot(), state);
+    this.getRoot().visit(visitor, state);
+    visitor.onEnd(this.getRoot(), state);
+};
+
+module.exports = {
+    Tree,
+    Node,
+    Visitor,
+    CompositeVisitor
+};