Commit

8 files changed, 2282 insertions, 0 deletions

diff --git a/src/node_modules/eslint-scope/lib/definition.js b/src/node_modules/eslint-scope/lib/definition.js
new file mode 100644
index 0000000..172bfe2
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/definition.js
@@ -0,0 +1,86 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+const Variable = require("./variable");
+
+/**
+ * @class Definition
+ */
+class Definition {
+    constructor(type, name, node, parent, index, kind) {
+
+        /**
+         * @member {String} Definition#type - type of the occurrence (e.g. "Parameter", "Variable", ...).
+         */
+        this.type = type;
+
+        /**
+         * @member {espree.Identifier} Definition#name - the identifier AST node of the occurrence.
+         */
+        this.name = name;
+
+        /**
+         * @member {espree.Node} Definition#node - the enclosing node of the identifier.
+         */
+        this.node = node;
+
+        /**
+         * @member {espree.Node?} Definition#parent - the enclosing statement node of the identifier.
+         */
+        this.parent = parent;
+
+        /**
+         * @member {Number?} Definition#index - the index in the declaration statement.
+         */
+        this.index = index;
+
+        /**
+         * @member {String?} Definition#kind - the kind of the declaration statement.
+         */
+        this.kind = kind;
+    }
+}
+
+/**
+ * @class ParameterDefinition
+ */
+class ParameterDefinition extends Definition {
+    constructor(name, node, index, rest) {
+        super(Variable.Parameter, name, node, null, index, null);
+
+        /**
+         * Whether the parameter definition is a part of a rest parameter.
+         * @member {boolean} ParameterDefinition#rest
+         */
+        this.rest = rest;
+    }
+}
+
+module.exports = {
+    ParameterDefinition,
+    Definition
+};
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/index.js b/src/node_modules/eslint-scope/lib/index.js
new file mode 100644
index 0000000..0f16fa4
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/index.js
@@ -0,0 +1,165 @@
+/*
+  Copyright (C) 2012-2014 Yusuke Suzuki <utatane.tea@gmail.com>
+  Copyright (C) 2013 Alex Seville <hi@alexanderseville.com>
+  Copyright (C) 2014 Thiago de Arruda <tpadilha84@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+ * Escope (<a href="http://github.com/estools/escope">escope</a>) is an <a
+ * href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">ECMAScript</a>
+ * scope analyzer extracted from the <a
+ * href="http://github.com/estools/esmangle">esmangle project</a/>.
+ * <p>
+ * <em>escope</em> finds lexical scopes in a source program, i.e. areas of that
+ * program where different occurrences of the same identifier refer to the same
+ * variable. With each scope the contained variables are collected, and each
+ * identifier reference in code is linked to its corresponding variable (if
+ * possible).
+ * <p>
+ * <em>escope</em> works on a syntax tree of the parsed source code which has
+ * to adhere to the <a
+ * href="https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API">
+ * Mozilla Parser API</a>. E.g. <a href="https://github.com/eslint/espree">espree</a> is a parser
+ * that produces such syntax trees.
+ * <p>
+ * The main interface is the {@link analyze} function.
+ * @module escope
+ */
+"use strict";
+
+/* eslint no-underscore-dangle: ["error", { "allow": ["__currentScope"] }] */
+
+const assert = require("assert");
+
+const ScopeManager = require("./scope-manager");
+const Referencer = require("./referencer");
+const Reference = require("./reference");
+const Variable = require("./variable");
+const Scope = require("./scope").Scope;
+const version = require("../package.json").version;
+
+/**
+ * Set the default options
+ * @returns {Object} options
+ */
+function defaultOptions() {
+    return {
+        optimistic: false,
+        directive: false,
+        nodejsScope: false,
+        impliedStrict: false,
+        sourceType: "script", // one of ['script', 'module']
+        ecmaVersion: 5,
+        childVisitorKeys: null,
+        fallback: "iteration"
+    };
+}
+
+/**
+ * Preform deep update on option object
+ * @param {Object} target - Options
+ * @param {Object} override - Updates
+ * @returns {Object} Updated options
+ */
+function updateDeeply(target, override) {
+
+    /**
+     * Is hash object
+     * @param {Object} value - Test value
+     * @returns {boolean} Result
+     */
+    function isHashObject(value) {
+        return typeof value === "object" && value instanceof Object && !(value instanceof Array) && !(value instanceof RegExp);
+    }
+
+    for (const key in override) {
+        if (Object.prototype.hasOwnProperty.call(override, key)) {
+            const val = override[key];
+
+            if (isHashObject(val)) {
+                if (isHashObject(target[key])) {
+                    updateDeeply(target[key], val);
+                } else {
+                    target[key] = updateDeeply({}, val);
+                }
+            } else {
+                target[key] = val;
+            }
+        }
+    }
+    return target;
+}
+
+/**
+ * Main interface function. Takes an Espree syntax tree and returns the
+ * analyzed scopes.
+ * @function analyze
+ * @param {espree.Tree} tree - Abstract Syntax Tree
+ * @param {Object} providedOptions - Options that tailor the scope analysis
+ * @param {boolean} [providedOptions.optimistic=false] - the optimistic flag
+ * @param {boolean} [providedOptions.directive=false]- the directive flag
+ * @param {boolean} [providedOptions.ignoreEval=false]- whether to check 'eval()' calls
+ * @param {boolean} [providedOptions.nodejsScope=false]- whether the whole
+ * script is executed under node.js environment. When enabled, escope adds
+ * a function scope immediately following the global scope.
+ * @param {boolean} [providedOptions.impliedStrict=false]- implied strict mode
+ * (if ecmaVersion >= 5).
+ * @param {string} [providedOptions.sourceType='script']- the source type of the script. one of 'script' and 'module'
+ * @param {number} [providedOptions.ecmaVersion=5]- which ECMAScript version is considered
+ * @param {Object} [providedOptions.childVisitorKeys=null] - Additional known visitor keys. See [esrecurse](https://github.com/estools/esrecurse)'s the `childVisitorKeys` option.
+ * @param {string} [providedOptions.fallback='iteration'] - A kind of the fallback in order to encounter with unknown node. See [esrecurse](https://github.com/estools/esrecurse)'s the `fallback` option.
+ * @returns {ScopeManager} ScopeManager
+ */
+function analyze(tree, providedOptions) {
+    const options = updateDeeply(defaultOptions(), providedOptions);
+    const scopeManager = new ScopeManager(options);
+    const referencer = new Referencer(options, scopeManager);
+
+    referencer.visit(tree);
+
+    assert(scopeManager.__currentScope === null, "currentScope should be null.");
+
+    return scopeManager;
+}
+
+module.exports = {
+
+    /** @name module:escope.version */
+    version,
+
+    /** @name module:escope.Reference */
+    Reference,
+
+    /** @name module:escope.Variable */
+    Variable,
+
+    /** @name module:escope.Scope */
+    Scope,
+
+    /** @name module:escope.ScopeManager */
+    ScopeManager,
+    analyze
+};
+
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/pattern-visitor.js b/src/node_modules/eslint-scope/lib/pattern-visitor.js
new file mode 100644
index 0000000..afa6291
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/pattern-visitor.js
@@ -0,0 +1,152 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+/* eslint-disable no-undefined */
+
+const Syntax = require("estraverse").Syntax;
+const esrecurse = require("esrecurse");
+
+/**
+ * Get last array element
+ * @param {array} xs - array
+ * @returns {any} Last elment
+ */
+function getLast(xs) {
+    return xs[xs.length - 1] || null;
+}
+
+class PatternVisitor extends esrecurse.Visitor {
+    static isPattern(node) {
+        const nodeType = node.type;
+
+        return (
+            nodeType === Syntax.Identifier ||
+            nodeType === Syntax.ObjectPattern ||
+            nodeType === Syntax.ArrayPattern ||
+            nodeType === Syntax.SpreadElement ||
+            nodeType === Syntax.RestElement ||
+            nodeType === Syntax.AssignmentPattern
+        );
+    }
+
+    constructor(options, rootPattern, callback) {
+        super(null, options);
+        this.rootPattern = rootPattern;
+        this.callback = callback;
+        this.assignments = [];
+        this.rightHandNodes = [];
+        this.restElements = [];
+    }
+
+    Identifier(pattern) {
+        const lastRestElement = getLast(this.restElements);
+
+        this.callback(pattern, {
+            topLevel: pattern === this.rootPattern,
+            rest: lastRestElement !== null && lastRestElement !== undefined && lastRestElement.argument === pattern,
+            assignments: this.assignments
+        });
+    }
+
+    Property(property) {
+
+        // Computed property's key is a right hand node.
+        if (property.computed) {
+            this.rightHandNodes.push(property.key);
+        }
+
+        // If it's shorthand, its key is same as its value.
+        // If it's shorthand and has its default value, its key is same as its value.left (the value is AssignmentPattern).
+        // If it's not shorthand, the name of new variable is its value's.
+        this.visit(property.value);
+    }
+
+    ArrayPattern(pattern) {
+        for (let i = 0, iz = pattern.elements.length; i < iz; ++i) {
+            const element = pattern.elements[i];
+
+            this.visit(element);
+        }
+    }
+
+    AssignmentPattern(pattern) {
+        this.assignments.push(pattern);
+        this.visit(pattern.left);
+        this.rightHandNodes.push(pattern.right);
+        this.assignments.pop();
+    }
+
+    RestElement(pattern) {
+        this.restElements.push(pattern);
+        this.visit(pattern.argument);
+        this.restElements.pop();
+    }
+
+    MemberExpression(node) {
+
+        // Computed property's key is a right hand node.
+        if (node.computed) {
+            this.rightHandNodes.push(node.property);
+        }
+
+        // the object is only read, write to its property.
+        this.rightHandNodes.push(node.object);
+    }
+
+    //
+    // ForInStatement.left and AssignmentExpression.left are LeftHandSideExpression.
+    // By spec, LeftHandSideExpression is Pattern or MemberExpression.
+    //   (see also: https://github.com/estree/estree/pull/20#issuecomment-74584758)
+    // But espree 2.0 parses to ArrayExpression, ObjectExpression, etc...
+    //
+
+    SpreadElement(node) {
+        this.visit(node.argument);
+    }
+
+    ArrayExpression(node) {
+        node.elements.forEach(this.visit, this);
+    }
+
+    AssignmentExpression(node) {
+        this.assignments.push(node);
+        this.visit(node.left);
+        this.rightHandNodes.push(node.right);
+        this.assignments.pop();
+    }
+
+    CallExpression(node) {
+
+        // arguments are right hand nodes.
+        node.arguments.forEach(a => {
+            this.rightHandNodes.push(a);
+        });
+        this.visit(node.callee);
+    }
+}
+
+module.exports = PatternVisitor;
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/reference.js b/src/node_modules/eslint-scope/lib/reference.js
new file mode 100644
index 0000000..9529827
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/reference.js
@@ -0,0 +1,167 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+const READ = 0x1;
+const WRITE = 0x2;
+const RW = READ | WRITE;
+
+/**
+ * A Reference represents a single occurrence of an identifier in code.
+ * @class Reference
+ */
+class Reference {
+    constructor(ident, scope, flag, writeExpr, maybeImplicitGlobal, partial, init) {
+
+        /**
+         * Identifier syntax node.
+         * @member {espreeIdentifier} Reference#identifier
+         */
+        this.identifier = ident;
+
+        /**
+         * Reference to the enclosing Scope.
+         * @member {Scope} Reference#from
+         */
+        this.from = scope;
+
+        /**
+         * Whether the reference comes from a dynamic scope (such as 'eval',
+         * 'with', etc.), and may be trapped by dynamic scopes.
+         * @member {boolean} Reference#tainted
+         */
+        this.tainted = false;
+
+        /**
+         * The variable this reference is resolved with.
+         * @member {Variable} Reference#resolved
+         */
+        this.resolved = null;
+
+        /**
+         * The read-write mode of the reference. (Value is one of {@link
+         * Reference.READ}, {@link Reference.RW}, {@link Reference.WRITE}).
+         * @member {number} Reference#flag
+         * @private
+         */
+        this.flag = flag;
+        if (this.isWrite()) {
+
+            /**
+             * If reference is writeable, this is the tree being written to it.
+             * @member {espreeNode} Reference#writeExpr
+             */
+            this.writeExpr = writeExpr;
+
+            /**
+             * Whether the Reference might refer to a partial value of writeExpr.
+             * @member {boolean} Reference#partial
+             */
+            this.partial = partial;
+
+            /**
+             * Whether the Reference is to write of initialization.
+             * @member {boolean} Reference#init
+             */
+            this.init = init;
+        }
+        this.__maybeImplicitGlobal = maybeImplicitGlobal;
+    }
+
+    /**
+     * Whether the reference is static.
+     * @method Reference#isStatic
+     * @returns {boolean} static
+     */
+    isStatic() {
+        return !this.tainted && this.resolved && this.resolved.scope.isStatic();
+    }
+
+    /**
+     * Whether the reference is writeable.
+     * @method Reference#isWrite
+     * @returns {boolean} write
+     */
+    isWrite() {
+        return !!(this.flag & Reference.WRITE);
+    }
+
+    /**
+     * Whether the reference is readable.
+     * @method Reference#isRead
+     * @returns {boolean} read
+     */
+    isRead() {
+        return !!(this.flag & Reference.READ);
+    }
+
+    /**
+     * Whether the reference is read-only.
+     * @method Reference#isReadOnly
+     * @returns {boolean} read only
+     */
+    isReadOnly() {
+        return this.flag === Reference.READ;
+    }
+
+    /**
+     * Whether the reference is write-only.
+     * @method Reference#isWriteOnly
+     * @returns {boolean} write only
+     */
+    isWriteOnly() {
+        return this.flag === Reference.WRITE;
+    }
+
+    /**
+     * Whether the reference is read-write.
+     * @method Reference#isReadWrite
+     * @returns {boolean} read write
+     */
+    isReadWrite() {
+        return this.flag === Reference.RW;
+    }
+}
+
+/**
+ * @constant Reference.READ
+ * @private
+ */
+Reference.READ = READ;
+
+/**
+ * @constant Reference.WRITE
+ * @private
+ */
+Reference.WRITE = WRITE;
+
+/**
+ * @constant Reference.RW
+ * @private
+ */
+Reference.RW = RW;
+
+module.exports = Reference;
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/referencer.js b/src/node_modules/eslint-scope/lib/referencer.js
new file mode 100644
index 0000000..63d1935
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/referencer.js
@@ -0,0 +1,629 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+/* eslint-disable no-underscore-dangle */
+/* eslint-disable no-undefined */
+
+const Syntax = require("estraverse").Syntax;
+const esrecurse = require("esrecurse");
+const Reference = require("./reference");
+const Variable = require("./variable");
+const PatternVisitor = require("./pattern-visitor");
+const definition = require("./definition");
+const assert = require("assert");
+
+const ParameterDefinition = definition.ParameterDefinition;
+const Definition = definition.Definition;
+
+/**
+ * Traverse identifier in pattern
+ * @param {Object} options - options
+ * @param {pattern} rootPattern - root pattern
+ * @param {Refencer} referencer - referencer
+ * @param {callback} callback - callback
+ * @returns {void}
+ */
+function traverseIdentifierInPattern(options, rootPattern, referencer, callback) {
+
+    // Call the callback at left hand identifier nodes, and Collect right hand nodes.
+    const visitor = new PatternVisitor(options, rootPattern, callback);
+
+    visitor.visit(rootPattern);
+
+    // Process the right hand nodes recursively.
+    if (referencer !== null && referencer !== undefined) {
+        visitor.rightHandNodes.forEach(referencer.visit, referencer);
+    }
+}
+
+// Importing ImportDeclaration.
+// http://people.mozilla.org/~jorendorff/es6-draft.html#sec-moduledeclarationinstantiation
+// https://github.com/estree/estree/blob/master/es6.md#importdeclaration
+// FIXME: Now, we don't create module environment, because the context is
+// implementation dependent.
+
+class Importer extends esrecurse.Visitor {
+    constructor(declaration, referencer) {
+        super(null, referencer.options);
+        this.declaration = declaration;
+        this.referencer = referencer;
+    }
+
+    visitImport(id, specifier) {
+        this.referencer.visitPattern(id, pattern => {
+            this.referencer.currentScope().__define(pattern,
+                new Definition(
+                    Variable.ImportBinding,
+                    pattern,
+                    specifier,
+                    this.declaration,
+                    null,
+                    null
+                ));
+        });
+    }
+
+    ImportNamespaceSpecifier(node) {
+        const local = (node.local || node.id);
+
+        if (local) {
+            this.visitImport(local, node);
+        }
+    }
+
+    ImportDefaultSpecifier(node) {
+        const local = (node.local || node.id);
+
+        this.visitImport(local, node);
+    }
+
+    ImportSpecifier(node) {
+        const local = (node.local || node.id);
+
+        if (node.name) {
+            this.visitImport(node.name, node);
+        } else {
+            this.visitImport(local, node);
+        }
+    }
+}
+
+// Referencing variables and creating bindings.
+class Referencer extends esrecurse.Visitor {
+    constructor(options, scopeManager) {
+        super(null, options);
+        this.options = options;
+        this.scopeManager = scopeManager;
+        this.parent = null;
+        this.isInnerMethodDefinition = false;
+    }
+
+    currentScope() {
+        return this.scopeManager.__currentScope;
+    }
+
+    close(node) {
+        while (this.currentScope() && node === this.currentScope().block) {
+            this.scopeManager.__currentScope = this.currentScope().__close(this.scopeManager);
+        }
+    }
+
+    pushInnerMethodDefinition(isInnerMethodDefinition) {
+        const previous = this.isInnerMethodDefinition;
+
+        this.isInnerMethodDefinition = isInnerMethodDefinition;
+        return previous;
+    }
+
+    popInnerMethodDefinition(isInnerMethodDefinition) {
+        this.isInnerMethodDefinition = isInnerMethodDefinition;
+    }
+
+    referencingDefaultValue(pattern, assignments, maybeImplicitGlobal, init) {
+        const scope = this.currentScope();
+
+        assignments.forEach(assignment => {
+            scope.__referencing(
+                pattern,
+                Reference.WRITE,
+                assignment.right,
+                maybeImplicitGlobal,
+                pattern !== assignment.left,
+                init
+            );
+        });
+    }
+
+    visitPattern(node, options, callback) {
+        let visitPatternOptions = options;
+        let visitPatternCallback = callback;
+
+        if (typeof options === "function") {
+            visitPatternCallback = options;
+            visitPatternOptions = { processRightHandNodes: false };
+        }
+
+        traverseIdentifierInPattern(
+            this.options,
+            node,
+            visitPatternOptions.processRightHandNodes ? this : null,
+            visitPatternCallback
+        );
+    }
+
+    visitFunction(node) {
+        let i, iz;
+
+        // FunctionDeclaration name is defined in upper scope
+        // NOTE: Not referring variableScope. It is intended.
+        // Since
+        //  in ES5, FunctionDeclaration should be in FunctionBody.
+        //  in ES6, FunctionDeclaration should be block scoped.
+
+        if (node.type === Syntax.FunctionDeclaration) {
+
+            // id is defined in upper scope
+            this.currentScope().__define(node.id,
+                new Definition(
+                    Variable.FunctionName,
+                    node.id,
+                    node,
+                    null,
+                    null,
+                    null
+                ));
+        }
+
+        // FunctionExpression with name creates its special scope;
+        // FunctionExpressionNameScope.
+        if (node.type === Syntax.FunctionExpression && node.id) {
+            this.scopeManager.__nestFunctionExpressionNameScope(node);
+        }
+
+        // Consider this function is in the MethodDefinition.
+        this.scopeManager.__nestFunctionScope(node, this.isInnerMethodDefinition);
+
+        const that = this;
+
+        /**
+         * Visit pattern callback
+         * @param {pattern} pattern - pattern
+         * @param {Object} info - info
+         * @returns {void}
+         */
+        function visitPatternCallback(pattern, info) {
+            that.currentScope().__define(pattern,
+                new ParameterDefinition(
+                    pattern,
+                    node,
+                    i,
+                    info.rest
+                ));
+
+            that.referencingDefaultValue(pattern, info.assignments, null, true);
+        }
+
+        // Process parameter declarations.
+        for (i = 0, iz = node.params.length; i < iz; ++i) {
+            this.visitPattern(node.params[i], { processRightHandNodes: true }, visitPatternCallback);
+        }
+
+        // if there's a rest argument, add that
+        if (node.rest) {
+            this.visitPattern({
+                type: "RestElement",
+                argument: node.rest
+            }, pattern => {
+                this.currentScope().__define(pattern,
+                    new ParameterDefinition(
+                        pattern,
+                        node,
+                        node.params.length,
+                        true
+                    ));
+            });
+        }
+
+        // In TypeScript there are a number of function-like constructs which have no body,
+        // so check it exists before traversing
+        if (node.body) {
+
+            // Skip BlockStatement to prevent creating BlockStatement scope.
+            if (node.body.type === Syntax.BlockStatement) {
+                this.visitChildren(node.body);
+            } else {
+                this.visit(node.body);
+            }
+        }
+
+        this.close(node);
+    }
+
+    visitClass(node) {
+        if (node.type === Syntax.ClassDeclaration) {
+            this.currentScope().__define(node.id,
+                new Definition(
+                    Variable.ClassName,
+                    node.id,
+                    node,
+                    null,
+                    null,
+                    null
+                ));
+        }
+
+        this.visit(node.superClass);
+
+        this.scopeManager.__nestClassScope(node);
+
+        if (node.id) {
+            this.currentScope().__define(node.id,
+                new Definition(
+                    Variable.ClassName,
+                    node.id,
+                    node
+                ));
+        }
+        this.visit(node.body);
+
+        this.close(node);
+    }
+
+    visitProperty(node) {
+        let previous;
+
+        if (node.computed) {
+            this.visit(node.key);
+        }
+
+        const isMethodDefinition = node.type === Syntax.MethodDefinition;
+
+        if (isMethodDefinition) {
+            previous = this.pushInnerMethodDefinition(true);
+        }
+        this.visit(node.value);
+        if (isMethodDefinition) {
+            this.popInnerMethodDefinition(previous);
+        }
+    }
+
+    visitForIn(node) {
+        if (node.left.type === Syntax.VariableDeclaration && node.left.kind !== "var") {
+            this.scopeManager.__nestForScope(node);
+        }
+
+        if (node.left.type === Syntax.VariableDeclaration) {
+            this.visit(node.left);
+            this.visitPattern(node.left.declarations[0].id, pattern => {
+                this.currentScope().__referencing(pattern, Reference.WRITE, node.right, null, true, true);
+            });
+        } else {
+            this.visitPattern(node.left, { processRightHandNodes: true }, (pattern, info) => {
+                let maybeImplicitGlobal = null;
+
+                if (!this.currentScope().isStrict) {
+                    maybeImplicitGlobal = {
+                        pattern,
+                        node
+                    };
+                }
+                this.referencingDefaultValue(pattern, info.assignments, maybeImplicitGlobal, false);
+                this.currentScope().__referencing(pattern, Reference.WRITE, node.right, maybeImplicitGlobal, true, false);
+            });
+        }
+        this.visit(node.right);
+        this.visit(node.body);
+
+        this.close(node);
+    }
+
+    visitVariableDeclaration(variableTargetScope, type, node, index) {
+
+        const decl = node.declarations[index];
+        const init = decl.init;
+
+        this.visitPattern(decl.id, { processRightHandNodes: true }, (pattern, info) => {
+            variableTargetScope.__define(
+                pattern,
+                new Definition(
+                    type,
+                    pattern,
+                    decl,
+                    node,
+                    index,
+                    node.kind
+                )
+            );
+
+            this.referencingDefaultValue(pattern, info.assignments, null, true);
+            if (init) {
+                this.currentScope().__referencing(pattern, Reference.WRITE, init, null, !info.topLevel, true);
+            }
+        });
+    }
+
+    AssignmentExpression(node) {
+        if (PatternVisitor.isPattern(node.left)) {
+            if (node.operator === "=") {
+                this.visitPattern(node.left, { processRightHandNodes: true }, (pattern, info) => {
+                    let maybeImplicitGlobal = null;
+
+                    if (!this.currentScope().isStrict) {
+                        maybeImplicitGlobal = {
+                            pattern,
+                            node
+                        };
+                    }
+                    this.referencingDefaultValue(pattern, info.assignments, maybeImplicitGlobal, false);
+                    this.currentScope().__referencing(pattern, Reference.WRITE, node.right, maybeImplicitGlobal, !info.topLevel, false);
+                });
+            } else {
+                this.currentScope().__referencing(node.left, Reference.RW, node.right);
+            }
+        } else {
+            this.visit(node.left);
+        }
+        this.visit(node.right);
+    }
+
+    CatchClause(node) {
+        this.scopeManager.__nestCatchScope(node);
+
+        this.visitPattern(node.param, { processRightHandNodes: true }, (pattern, info) => {
+            this.currentScope().__define(pattern,
+                new Definition(
+                    Variable.CatchClause,
+                    node.param,
+                    node,
+                    null,
+                    null,
+                    null
+                ));
+            this.referencingDefaultValue(pattern, info.assignments, null, true);
+        });
+        this.visit(node.body);
+
+        this.close(node);
+    }
+
+    Program(node) {
+        this.scopeManager.__nestGlobalScope(node);
+
+        if (this.scopeManager.__isNodejsScope()) {
+
+            // Force strictness of GlobalScope to false when using node.js scope.
+            this.currentScope().isStrict = false;
+            this.scopeManager.__nestFunctionScope(node, false);
+        }
+
+        if (this.scopeManager.__isES6() && this.scopeManager.isModule()) {
+            this.scopeManager.__nestModuleScope(node);
+        }
+
+        if (this.scopeManager.isStrictModeSupported() && this.scopeManager.isImpliedStrict()) {
+            this.currentScope().isStrict = true;
+        }
+
+        this.visitChildren(node);
+        this.close(node);
+    }
+
+    Identifier(node) {
+        this.currentScope().__referencing(node);
+    }
+
+    UpdateExpression(node) {
+        if (PatternVisitor.isPattern(node.argument)) {
+            this.currentScope().__referencing(node.argument, Reference.RW, null);
+        } else {
+            this.visitChildren(node);
+        }
+    }
+
+    MemberExpression(node) {
+        this.visit(node.object);
+        if (node.computed) {
+            this.visit(node.property);
+        }
+    }
+
+    Property(node) {
+        this.visitProperty(node);
+    }
+
+    MethodDefinition(node) {
+        this.visitProperty(node);
+    }
+
+    BreakStatement() {} // eslint-disable-line class-methods-use-this
+
+    ContinueStatement() {} // eslint-disable-line class-methods-use-this
+
+    LabeledStatement(node) {
+        this.visit(node.body);
+    }
+
+    ForStatement(node) {
+
+        // Create ForStatement declaration.
+        // NOTE: In ES6, ForStatement dynamically generates
+        // per iteration environment. However, escope is
+        // a static analyzer, we only generate one scope for ForStatement.
+        if (node.init && node.init.type === Syntax.VariableDeclaration && node.init.kind !== "var") {
+            this.scopeManager.__nestForScope(node);
+        }
+
+        this.visitChildren(node);
+
+        this.close(node);
+    }
+
+    ClassExpression(node) {
+        this.visitClass(node);
+    }
+
+    ClassDeclaration(node) {
+        this.visitClass(node);
+    }
+
+    CallExpression(node) {
+
+        // Check this is direct call to eval
+        if (!this.scopeManager.__ignoreEval() && node.callee.type === Syntax.Identifier && node.callee.name === "eval") {
+
+            // NOTE: This should be `variableScope`. Since direct eval call always creates Lexical environment and
+            // let / const should be enclosed into it. Only VariableDeclaration affects on the caller's environment.
+            this.currentScope().variableScope.__detectEval();
+        }
+        this.visitChildren(node);
+    }
+
+    BlockStatement(node) {
+        if (this.scopeManager.__isES6()) {
+            this.scopeManager.__nestBlockScope(node);
+        }
+
+        this.visitChildren(node);
+
+        this.close(node);
+    }
+
+    ThisExpression() {
+        this.currentScope().variableScope.__detectThis();
+    }
+
+    WithStatement(node) {
+        this.visit(node.object);
+
+        // Then nest scope for WithStatement.
+        this.scopeManager.__nestWithScope(node);
+
+        this.visit(node.body);
+
+        this.close(node);
+    }
+
+    VariableDeclaration(node) {
+        const variableTargetScope = (node.kind === "var") ? this.currentScope().variableScope : this.currentScope();
+
+        for (let i = 0, iz = node.declarations.length; i < iz; ++i) {
+            const decl = node.declarations[i];
+
+            this.visitVariableDeclaration(variableTargetScope, Variable.Variable, node, i);
+            if (decl.init) {
+                this.visit(decl.init);
+            }
+        }
+    }
+
+    // sec 13.11.8
+    SwitchStatement(node) {
+        this.visit(node.discriminant);
+
+        if (this.scopeManager.__isES6()) {
+            this.scopeManager.__nestSwitchScope(node);
+        }
+
+        for (let i = 0, iz = node.cases.length; i < iz; ++i) {
+            this.visit(node.cases[i]);
+        }
+
+        this.close(node);
+    }
+
+    FunctionDeclaration(node) {
+        this.visitFunction(node);
+    }
+
+    FunctionExpression(node) {
+        this.visitFunction(node);
+    }
+
+    ForOfStatement(node) {
+        this.visitForIn(node);
+    }
+
+    ForInStatement(node) {
+        this.visitForIn(node);
+    }
+
+    ArrowFunctionExpression(node) {
+        this.visitFunction(node);
+    }
+
+    ImportDeclaration(node) {
+        assert(this.scopeManager.__isES6() && this.scopeManager.isModule(), "ImportDeclaration should appear when the mode is ES6 and in the module context.");
+
+        const importer = new Importer(node, this);
+
+        importer.visit(node);
+    }
+
+    visitExportDeclaration(node) {
+        if (node.source) {
+            return;
+        }
+        if (node.declaration) {
+            this.visit(node.declaration);
+            return;
+        }
+
+        this.visitChildren(node);
+    }
+
+    // TODO: ExportDeclaration doesn't exist. for bc?
+    ExportDeclaration(node) {
+        this.visitExportDeclaration(node);
+    }
+
+    ExportAllDeclaration(node) {
+        this.visitExportDeclaration(node);
+    }
+
+    ExportDefaultDeclaration(node) {
+        this.visitExportDeclaration(node);
+    }
+
+    ExportNamedDeclaration(node) {
+        this.visitExportDeclaration(node);
+    }
+
+    ExportSpecifier(node) {
+
+        // TODO: `node.id` doesn't exist. for bc?
+        const local = (node.id || node.local);
+
+        this.visit(local);
+    }
+
+    MetaProperty() { // eslint-disable-line class-methods-use-this
+
+        // do nothing.
+    }
+}
+
+module.exports = Referencer;
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/scope-manager.js b/src/node_modules/eslint-scope/lib/scope-manager.js
new file mode 100644
index 0000000..c192799
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/scope-manager.js
@@ -0,0 +1,247 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+/* eslint-disable no-underscore-dangle */
+
+const Scope = require("./scope");
+const assert = require("assert");
+
+const GlobalScope = Scope.GlobalScope;
+const CatchScope = Scope.CatchScope;
+const WithScope = Scope.WithScope;
+const ModuleScope = Scope.ModuleScope;
+const ClassScope = Scope.ClassScope;
+const SwitchScope = Scope.SwitchScope;
+const FunctionScope = Scope.FunctionScope;
+const ForScope = Scope.ForScope;
+const FunctionExpressionNameScope = Scope.FunctionExpressionNameScope;
+const BlockScope = Scope.BlockScope;
+
+/**
+ * @class ScopeManager
+ */
+class ScopeManager {
+    constructor(options) {
+        this.scopes = [];
+        this.globalScope = null;
+        this.__nodeToScope = new WeakMap();
+        this.__currentScope = null;
+        this.__options = options;
+        this.__declaredVariables = new WeakMap();
+    }
+
+    __useDirective() {
+        return this.__options.directive;
+    }
+
+    __isOptimistic() {
+        return this.__options.optimistic;
+    }
+
+    __ignoreEval() {
+        return this.__options.ignoreEval;
+    }
+
+    __isNodejsScope() {
+        return this.__options.nodejsScope;
+    }
+
+    isModule() {
+        return this.__options.sourceType === "module";
+    }
+
+    isImpliedStrict() {
+        return this.__options.impliedStrict;
+    }
+
+    isStrictModeSupported() {
+        return this.__options.ecmaVersion >= 5;
+    }
+
+    // Returns appropriate scope for this node.
+    __get(node) {
+        return this.__nodeToScope.get(node);
+    }
+
+    /**
+     * Get variables that are declared by the node.
+     *
+     * "are declared by the node" means the node is same as `Variable.defs[].node` or `Variable.defs[].parent`.
+     * If the node declares nothing, this method returns an empty array.
+     * CAUTION: This API is experimental. See https://github.com/estools/escope/pull/69 for more details.
+     *
+     * @param {Espree.Node} node - a node to get.
+     * @returns {Variable[]} variables that declared by the node.
+     */
+    getDeclaredVariables(node) {
+        return this.__declaredVariables.get(node) || [];
+    }
+
+    /**
+     * acquire scope from node.
+     * @method ScopeManager#acquire
+     * @param {Espree.Node} node - node for the acquired scope.
+     * @param {boolean=} inner - look up the most inner scope, default value is false.
+     * @returns {Scope?} Scope from node
+     */
+    acquire(node, inner) {
+
+        /**
+         * predicate
+         * @param {Scope} testScope - scope to test
+         * @returns {boolean} predicate
+         */
+        function predicate(testScope) {
+            if (testScope.type === "function" && testScope.functionExpressionScope) {
+                return false;
+            }
+            return true;
+        }
+
+        const scopes = this.__get(node);
+
+        if (!scopes || scopes.length === 0) {
+            return null;
+        }
+
+        // Heuristic selection from all scopes.
+        // If you would like to get all scopes, please use ScopeManager#acquireAll.
+        if (scopes.length === 1) {
+            return scopes[0];
+        }
+
+        if (inner) {
+            for (let i = scopes.length - 1; i >= 0; --i) {
+                const scope = scopes[i];
+
+                if (predicate(scope)) {
+                    return scope;
+                }
+            }
+        } else {
+            for (let i = 0, iz = scopes.length; i < iz; ++i) {
+                const scope = scopes[i];
+
+                if (predicate(scope)) {
+                    return scope;
+                }
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * acquire all scopes from node.
+     * @method ScopeManager#acquireAll
+     * @param {Espree.Node} node - node for the acquired scope.
+     * @returns {Scopes?} Scope array
+     */
+    acquireAll(node) {
+        return this.__get(node);
+    }
+
+    /**
+     * release the node.
+     * @method ScopeManager#release
+     * @param {Espree.Node} node - releasing node.
+     * @param {boolean=} inner - look up the most inner scope, default value is false.
+     * @returns {Scope?} upper scope for the node.
+     */
+    release(node, inner) {
+        const scopes = this.__get(node);
+
+        if (scopes && scopes.length) {
+            const scope = scopes[0].upper;
+
+            if (!scope) {
+                return null;
+            }
+            return this.acquire(scope.block, inner);
+        }
+        return null;
+    }
+
+    attach() { } // eslint-disable-line class-methods-use-this
+
+    detach() { } // eslint-disable-line class-methods-use-this
+
+    __nestScope(scope) {
+        if (scope instanceof GlobalScope) {
+            assert(this.__currentScope === null);
+            this.globalScope = scope;
+        }
+        this.__currentScope = scope;
+        return scope;
+    }
+
+    __nestGlobalScope(node) {
+        return this.__nestScope(new GlobalScope(this, node));
+    }
+
+    __nestBlockScope(node) {
+        return this.__nestScope(new BlockScope(this, this.__currentScope, node));
+    }
+
+    __nestFunctionScope(node, isMethodDefinition) {
+        return this.__nestScope(new FunctionScope(this, this.__currentScope, node, isMethodDefinition));
+    }
+
+    __nestForScope(node) {
+        return this.__nestScope(new ForScope(this, this.__currentScope, node));
+    }
+
+    __nestCatchScope(node) {
+        return this.__nestScope(new CatchScope(this, this.__currentScope, node));
+    }
+
+    __nestWithScope(node) {
+        return this.__nestScope(new WithScope(this, this.__currentScope, node));
+    }
+
+    __nestClassScope(node) {
+        return this.__nestScope(new ClassScope(this, this.__currentScope, node));
+    }
+
+    __nestSwitchScope(node) {
+        return this.__nestScope(new SwitchScope(this, this.__currentScope, node));
+    }
+
+    __nestModuleScope(node) {
+        return this.__nestScope(new ModuleScope(this, this.__currentScope, node));
+    }
+
+    __nestFunctionExpressionNameScope(node) {
+        return this.__nestScope(new FunctionExpressionNameScope(this, this.__currentScope, node));
+    }
+
+    __isES6() {
+        return this.__options.ecmaVersion >= 6;
+    }
+}
+
+module.exports = ScopeManager;
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/scope.js b/src/node_modules/eslint-scope/lib/scope.js
new file mode 100644
index 0000000..bdb5f63
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/scope.js
@@ -0,0 +1,748 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+/* eslint-disable no-underscore-dangle */
+/* eslint-disable no-undefined */
+
+const Syntax = require("estraverse").Syntax;
+
+const Reference = require("./reference");
+const Variable = require("./variable");
+const Definition = require("./definition").Definition;
+const assert = require("assert");
+
+/**
+ * Test if scope is struct
+ * @param {Scope} scope - scope
+ * @param {Block} block - block
+ * @param {boolean} isMethodDefinition - is method definition
+ * @param {boolean} useDirective - use directive
+ * @returns {boolean} is strict scope
+ */
+function isStrictScope(scope, block, isMethodDefinition, useDirective) {
+    let body;
+
+    // When upper scope is exists and strict, inner scope is also strict.
+    if (scope.upper && scope.upper.isStrict) {
+        return true;
+    }
+
+    if (isMethodDefinition) {
+        return true;
+    }
+
+    if (scope.type === "class" || scope.type === "module") {
+        return true;
+    }
+
+    if (scope.type === "block" || scope.type === "switch") {
+        return false;
+    }
+
+    if (scope.type === "function") {
+        if (block.type === Syntax.ArrowFunctionExpression && block.body.type !== Syntax.BlockStatement) {
+            return false;
+        }
+
+        if (block.type === Syntax.Program) {
+            body = block;
+        } else {
+            body = block.body;
+        }
+
+        if (!body) {
+            return false;
+        }
+    } else if (scope.type === "global") {
+        body = block;
+    } else {
+        return false;
+    }
+
+    // Search 'use strict' directive.
+    if (useDirective) {
+        for (let i = 0, iz = body.body.length; i < iz; ++i) {
+            const stmt = body.body[i];
+
+            if (stmt.type !== Syntax.DirectiveStatement) {
+                break;
+            }
+            if (stmt.raw === "\"use strict\"" || stmt.raw === "'use strict'") {
+                return true;
+            }
+        }
+    } else {
+        for (let i = 0, iz = body.body.length; i < iz; ++i) {
+            const stmt = body.body[i];
+
+            if (stmt.type !== Syntax.ExpressionStatement) {
+                break;
+            }
+            const expr = stmt.expression;
+
+            if (expr.type !== Syntax.Literal || typeof expr.value !== "string") {
+                break;
+            }
+            if (expr.raw !== null && expr.raw !== undefined) {
+                if (expr.raw === "\"use strict\"" || expr.raw === "'use strict'") {
+                    return true;
+                }
+            } else {
+                if (expr.value === "use strict") {
+                    return true;
+                }
+            }
+        }
+    }
+    return false;
+}
+
+/**
+ * Register scope
+ * @param {ScopeManager} scopeManager - scope manager
+ * @param {Scope} scope - scope
+ * @returns {void}
+ */
+function registerScope(scopeManager, scope) {
+    scopeManager.scopes.push(scope);
+
+    const scopes = scopeManager.__nodeToScope.get(scope.block);
+
+    if (scopes) {
+        scopes.push(scope);
+    } else {
+        scopeManager.__nodeToScope.set(scope.block, [scope]);
+    }
+}
+
+/**
+ * Should be statically
+ * @param {Object} def - def
+ * @returns {boolean} should be statically
+ */
+function shouldBeStatically(def) {
+    return (
+        (def.type === Variable.ClassName) ||
+        (def.type === Variable.Variable && def.parent.kind !== "var")
+    );
+}
+
+/**
+ * @class Scope
+ */
+class Scope {
+    constructor(scopeManager, type, upperScope, block, isMethodDefinition) {
+
+        /**
+         * One of 'module', 'block', 'switch', 'function', 'catch', 'with', 'function', 'class', 'global'.
+         * @member {String} Scope#type
+         */
+        this.type = type;
+
+        /**
+         * The scoped {@link Variable}s of this scope, as <code>{ Variable.name
+         * : Variable }</code>.
+         * @member {Map} Scope#set
+         */
+        this.set = new Map();
+
+        /**
+         * The tainted variables of this scope, as <code>{ Variable.name :
+         * boolean }</code>.
+         * @member {Map} Scope#taints */
+        this.taints = new Map();
+
+        /**
+         * Generally, through the lexical scoping of JS you can always know
+         * which variable an identifier in the source code refers to. There are
+         * a few exceptions to this rule. With 'global' and 'with' scopes you
+         * can only decide at runtime which variable a reference refers to.
+         * Moreover, if 'eval()' is used in a scope, it might introduce new
+         * bindings in this or its parent scopes.
+         * All those scopes are considered 'dynamic'.
+         * @member {boolean} Scope#dynamic
+         */
+        this.dynamic = this.type === "global" || this.type === "with";
+
+        /**
+         * A reference to the scope-defining syntax node.
+         * @member {espree.Node} Scope#block
+         */
+        this.block = block;
+
+        /**
+         * The {@link Reference|references} that are not resolved with this scope.
+         * @member {Reference[]} Scope#through
+         */
+        this.through = [];
+
+        /**
+         * The scoped {@link Variable}s of this scope. In the case of a
+         * 'function' scope this includes the automatic argument <em>arguments</em> as
+         * its first element, as well as all further formal arguments.
+         * @member {Variable[]} Scope#variables
+         */
+        this.variables = [];
+
+        /**
+         * Any variable {@link Reference|reference} found in this scope. This
+         * includes occurrences of local variables as well as variables from
+         * parent scopes (including the global scope). For local variables
+         * this also includes defining occurrences (like in a 'var' statement).
+         * In a 'function' scope this does not include the occurrences of the
+         * formal parameter in the parameter list.
+         * @member {Reference[]} Scope#references
+         */
+        this.references = [];
+
+        /**
+         * For 'global' and 'function' scopes, this is a self-reference. For
+         * other scope types this is the <em>variableScope</em> value of the
+         * parent scope.
+         * @member {Scope} Scope#variableScope
+         */
+        this.variableScope =
+            (this.type === "global" || this.type === "function" || this.type === "module") ? this : upperScope.variableScope;
+
+        /**
+         * Whether this scope is created by a FunctionExpression.
+         * @member {boolean} Scope#functionExpressionScope
+         */
+        this.functionExpressionScope = false;
+
+        /**
+         * Whether this is a scope that contains an 'eval()' invocation.
+         * @member {boolean} Scope#directCallToEvalScope
+         */
+        this.directCallToEvalScope = false;
+
+        /**
+         * @member {boolean} Scope#thisFound
+         */
+        this.thisFound = false;
+
+        this.__left = [];
+
+        /**
+         * Reference to the parent {@link Scope|scope}.
+         * @member {Scope} Scope#upper
+         */
+        this.upper = upperScope;
+
+        /**
+         * Whether 'use strict' is in effect in this scope.
+         * @member {boolean} Scope#isStrict
+         */
+        this.isStrict = isStrictScope(this, block, isMethodDefinition, scopeManager.__useDirective());
+
+        /**
+         * List of nested {@link Scope}s.
+         * @member {Scope[]} Scope#childScopes
+         */
+        this.childScopes = [];
+        if (this.upper) {
+            this.upper.childScopes.push(this);
+        }
+
+        this.__declaredVariables = scopeManager.__declaredVariables;
+
+        registerScope(scopeManager, this);
+    }
+
+    __shouldStaticallyClose(scopeManager) {
+        return (!this.dynamic || scopeManager.__isOptimistic());
+    }
+
+    __shouldStaticallyCloseForGlobal(ref) {
+
+        // On global scope, let/const/class declarations should be resolved statically.
+        const name = ref.identifier.name;
+
+        if (!this.set.has(name)) {
+            return false;
+        }
+
+        const variable = this.set.get(name);
+        const defs = variable.defs;
+
+        return defs.length > 0 && defs.every(shouldBeStatically);
+    }
+
+    __staticCloseRef(ref) {
+        if (!this.__resolve(ref)) {
+            this.__delegateToUpperScope(ref);
+        }
+    }
+
+    __dynamicCloseRef(ref) {
+
+        // notify all names are through to global
+        let current = this;
+
+        do {
+            current.through.push(ref);
+            current = current.upper;
+        } while (current);
+    }
+
+    __globalCloseRef(ref) {
+
+        // let/const/class declarations should be resolved statically.
+        // others should be resolved dynamically.
+        if (this.__shouldStaticallyCloseForGlobal(ref)) {
+            this.__staticCloseRef(ref);
+        } else {
+            this.__dynamicCloseRef(ref);
+        }
+    }
+
+    __close(scopeManager) {
+        let closeRef;
+
+        if (this.__shouldStaticallyClose(scopeManager)) {
+            closeRef = this.__staticCloseRef;
+        } else if (this.type !== "global") {
+            closeRef = this.__dynamicCloseRef;
+        } else {
+            closeRef = this.__globalCloseRef;
+        }
+
+        // Try Resolving all references in this scope.
+        for (let i = 0, iz = this.__left.length; i < iz; ++i) {
+            const ref = this.__left[i];
+
+            closeRef.call(this, ref);
+        }
+        this.__left = null;
+
+        return this.upper;
+    }
+
+    // To override by function scopes.
+    // References in default parameters isn't resolved to variables which are in their function body.
+    __isValidResolution(ref, variable) { // eslint-disable-line class-methods-use-this, no-unused-vars
+        return true;
+    }
+
+    __resolve(ref) {
+        const name = ref.identifier.name;
+
+        if (!this.set.has(name)) {
+            return false;
+        }
+        const variable = this.set.get(name);
+
+        if (!this.__isValidResolution(ref, variable)) {
+            return false;
+        }
+        variable.references.push(ref);
+        variable.stack = variable.stack && ref.from.variableScope === this.variableScope;
+        if (ref.tainted) {
+            variable.tainted = true;
+            this.taints.set(variable.name, true);
+        }
+        ref.resolved = variable;
+
+        return true;
+    }
+
+    __delegateToUpperScope(ref) {
+        if (this.upper) {
+            this.upper.__left.push(ref);
+        }
+        this.through.push(ref);
+    }
+
+    __addDeclaredVariablesOfNode(variable, node) {
+        if (node === null || node === undefined) {
+            return;
+        }
+
+        let variables = this.__declaredVariables.get(node);
+
+        if (variables === null || variables === undefined) {
+            variables = [];
+            this.__declaredVariables.set(node, variables);
+        }
+        if (variables.indexOf(variable) === -1) {
+            variables.push(variable);
+        }
+    }
+
+    __defineGeneric(name, set, variables, node, def) {
+        let variable;
+
+        variable = set.get(name);
+        if (!variable) {
+            variable = new Variable(name, this);
+            set.set(name, variable);
+            variables.push(variable);
+        }
+
+        if (def) {
+            variable.defs.push(def);
+            this.__addDeclaredVariablesOfNode(variable, def.node);
+            this.__addDeclaredVariablesOfNode(variable, def.parent);
+        }
+        if (node) {
+            variable.identifiers.push(node);
+        }
+    }
+
+    __define(node, def) {
+        if (node && node.type === Syntax.Identifier) {
+            this.__defineGeneric(
+                node.name,
+                this.set,
+                this.variables,
+                node,
+                def
+            );
+        }
+    }
+
+    __referencing(node, assign, writeExpr, maybeImplicitGlobal, partial, init) {
+
+        // because Array element may be null
+        if (!node || node.type !== Syntax.Identifier) {
+            return;
+        }
+
+        // Specially handle like `this`.
+        if (node.name === "super") {
+            return;
+        }
+
+        const ref = new Reference(node, this, assign || Reference.READ, writeExpr, maybeImplicitGlobal, !!partial, !!init);
+
+        this.references.push(ref);
+        this.__left.push(ref);
+    }
+
+    __detectEval() {
+        let current = this;
+
+        this.directCallToEvalScope = true;
+        do {
+            current.dynamic = true;
+            current = current.upper;
+        } while (current);
+    }
+
+    __detectThis() {
+        this.thisFound = true;
+    }
+
+    __isClosed() {
+        return this.__left === null;
+    }
+
+    /**
+     * returns resolved {Reference}
+     * @method Scope#resolve
+     * @param {Espree.Identifier} ident - identifier to be resolved.
+     * @returns {Reference} reference
+     */
+    resolve(ident) {
+        let ref, i, iz;
+
+        assert(this.__isClosed(), "Scope should be closed.");
+        assert(ident.type === Syntax.Identifier, "Target should be identifier.");
+        for (i = 0, iz = this.references.length; i < iz; ++i) {
+            ref = this.references[i];
+            if (ref.identifier === ident) {
+                return ref;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * returns this scope is static
+     * @method Scope#isStatic
+     * @returns {boolean} static
+     */
+    isStatic() {
+        return !this.dynamic;
+    }
+
+    /**
+     * returns this scope has materialized arguments
+     * @method Scope#isArgumentsMaterialized
+     * @returns {boolean} arguemnts materialized
+     */
+    isArgumentsMaterialized() { // eslint-disable-line class-methods-use-this
+        return true;
+    }
+
+    /**
+     * returns this scope has materialized `this` reference
+     * @method Scope#isThisMaterialized
+     * @returns {boolean} this materialized
+     */
+    isThisMaterialized() { // eslint-disable-line class-methods-use-this
+        return true;
+    }
+
+    isUsedName(name) {
+        if (this.set.has(name)) {
+            return true;
+        }
+        for (let i = 0, iz = this.through.length; i < iz; ++i) {
+            if (this.through[i].identifier.name === name) {
+                return true;
+            }
+        }
+        return false;
+    }
+}
+
+class GlobalScope extends Scope {
+    constructor(scopeManager, block) {
+        super(scopeManager, "global", null, block, false);
+        this.implicit = {
+            set: new Map(),
+            variables: [],
+
+            /**
+            * List of {@link Reference}s that are left to be resolved (i.e. which
+            * need to be linked to the variable they refer to).
+            * @member {Reference[]} Scope#implicit#left
+            */
+            left: []
+        };
+    }
+
+    __close(scopeManager) {
+        const implicit = [];
+
+        for (let i = 0, iz = this.__left.length; i < iz; ++i) {
+            const ref = this.__left[i];
+
+            if (ref.__maybeImplicitGlobal && !this.set.has(ref.identifier.name)) {
+                implicit.push(ref.__maybeImplicitGlobal);
+            }
+        }
+
+        // create an implicit global variable from assignment expression
+        for (let i = 0, iz = implicit.length; i < iz; ++i) {
+            const info = implicit[i];
+
+            this.__defineImplicit(info.pattern,
+                new Definition(
+                    Variable.ImplicitGlobalVariable,
+                    info.pattern,
+                    info.node,
+                    null,
+                    null,
+                    null
+                ));
+
+        }
+
+        this.implicit.left = this.__left;
+
+        return super.__close(scopeManager);
+    }
+
+    __defineImplicit(node, def) {
+        if (node && node.type === Syntax.Identifier) {
+            this.__defineGeneric(
+                node.name,
+                this.implicit.set,
+                this.implicit.variables,
+                node,
+                def
+            );
+        }
+    }
+}
+
+class ModuleScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "module", upperScope, block, false);
+    }
+}
+
+class FunctionExpressionNameScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "function-expression-name", upperScope, block, false);
+        this.__define(block.id,
+            new Definition(
+                Variable.FunctionName,
+                block.id,
+                block,
+                null,
+                null,
+                null
+            ));
+        this.functionExpressionScope = true;
+    }
+}
+
+class CatchScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "catch", upperScope, block, false);
+    }
+}
+
+class WithScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "with", upperScope, block, false);
+    }
+
+    __close(scopeManager) {
+        if (this.__shouldStaticallyClose(scopeManager)) {
+            return super.__close(scopeManager);
+        }
+
+        for (let i = 0, iz = this.__left.length; i < iz; ++i) {
+            const ref = this.__left[i];
+
+            ref.tainted = true;
+            this.__delegateToUpperScope(ref);
+        }
+        this.__left = null;
+
+        return this.upper;
+    }
+}
+
+class BlockScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "block", upperScope, block, false);
+    }
+}
+
+class SwitchScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "switch", upperScope, block, false);
+    }
+}
+
+class FunctionScope extends Scope {
+    constructor(scopeManager, upperScope, block, isMethodDefinition) {
+        super(scopeManager, "function", upperScope, block, isMethodDefinition);
+
+        // section 9.2.13, FunctionDeclarationInstantiation.
+        // NOTE Arrow functions never have an arguments objects.
+        if (this.block.type !== Syntax.ArrowFunctionExpression) {
+            this.__defineArguments();
+        }
+    }
+
+    isArgumentsMaterialized() {
+
+        // TODO(Constellation)
+        // We can more aggressive on this condition like this.
+        //
+        // function t() {
+        //     // arguments of t is always hidden.
+        //     function arguments() {
+        //     }
+        // }
+        if (this.block.type === Syntax.ArrowFunctionExpression) {
+            return false;
+        }
+
+        if (!this.isStatic()) {
+            return true;
+        }
+
+        const variable = this.set.get("arguments");
+
+        assert(variable, "Always have arguments variable.");
+        return variable.tainted || variable.references.length !== 0;
+    }
+
+    isThisMaterialized() {
+        if (!this.isStatic()) {
+            return true;
+        }
+        return this.thisFound;
+    }
+
+    __defineArguments() {
+        this.__defineGeneric(
+            "arguments",
+            this.set,
+            this.variables,
+            null,
+            null
+        );
+        this.taints.set("arguments", true);
+    }
+
+    // References in default parameters isn't resolved to variables which are in their function body.
+    //     const x = 1
+    //     function f(a = x) { // This `x` is resolved to the `x` in the outer scope.
+    //         const x = 2
+    //         console.log(a)
+    //     }
+    __isValidResolution(ref, variable) {
+
+        // If `options.nodejsScope` is true, `this.block` becomes a Program node.
+        if (this.block.type === "Program") {
+            return true;
+        }
+
+        const bodyStart = this.block.body.range[0];
+
+        // It's invalid resolution in the following case:
+        return !(
+            variable.scope === this &&
+            ref.identifier.range[0] < bodyStart && // the reference is in the parameter part.
+            variable.defs.every(d => d.name.range[0] >= bodyStart) // the variable is in the body.
+        );
+    }
+}
+
+class ForScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "for", upperScope, block, false);
+    }
+}
+
+class ClassScope extends Scope {
+    constructor(scopeManager, upperScope, block) {
+        super(scopeManager, "class", upperScope, block, false);
+    }
+}
+
+module.exports = {
+    Scope,
+    GlobalScope,
+    ModuleScope,
+    FunctionExpressionNameScope,
+    CatchScope,
+    WithScope,
+    BlockScope,
+    SwitchScope,
+    FunctionScope,
+    ForScope,
+    ClassScope
+};
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/src/node_modules/eslint-scope/lib/variable.js b/src/node_modules/eslint-scope/lib/variable.js
new file mode 100644
index 0000000..702c478
--- /dev/null
+++ b/src/node_modules/eslint-scope/lib/variable.js
@@ -0,0 +1,88 @@
+/*
+  Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+"use strict";
+
+/**
+ * A Variable represents a locally scoped identifier. These include arguments to
+ * functions.
+ * @class Variable
+ */
+class Variable {
+    constructor(name, scope) {
+
+        /**
+         * The variable name, as given in the source code.
+         * @member {String} Variable#name
+         */
+        this.name = name;
+
+        /**
+         * List of defining occurrences of this variable (like in 'var ...'
+         * statements or as parameter), as AST nodes.
+         * @member {espree.Identifier[]} Variable#identifiers
+         */
+        this.identifiers = [];
+
+        /**
+         * List of {@link Reference|references} of this variable (excluding parameter entries)
+         * in its defining scope and all nested scopes. For defining
+         * occurrences only see {@link Variable#defs}.
+         * @member {Reference[]} Variable#references
+         */
+        this.references = [];
+
+        /**
+         * List of defining occurrences of this variable (like in 'var ...'
+         * statements or as parameter), as custom objects.
+         * @member {Definition[]} Variable#defs
+         */
+        this.defs = [];
+
+        this.tainted = false;
+
+        /**
+         * Whether this is a stack variable.
+         * @member {boolean} Variable#stack
+         */
+        this.stack = true;
+
+        /**
+         * Reference to the enclosing Scope.
+         * @member {Scope} Variable#scope
+         */
+        this.scope = scope;
+    }
+}
+
+Variable.CatchClause = "CatchClause";
+Variable.Parameter = "Parameter";
+Variable.FunctionName = "FunctionName";
+Variable.ClassName = "ClassName";
+Variable.Variable = "Variable";
+Variable.ImportBinding = "ImportBinding";
+Variable.ImplicitGlobalVariable = "ImplicitGlobalVariable";
+
+module.exports = Variable;
+
+/* vim: set sw=4 ts=4 et tw=80 : */