3 files changed, 154 insertions, 0 deletions
diff --git a/node_modules/espurify/lib/ast-properties.js b/node_modules/espurify/lib/ast-properties.js
new file mode 100644
index 000000000..37267b973
--- /dev/null
+++ b/node_modules/espurify/lib/ast-properties.js
@@ -0,0 +1,68 @@
+module.exports = {
+    ArrayExpression: ['type', 'elements'],
+    ArrayPattern: ['type', 'elements'],
+    ArrowFunctionExpression: ['type', 'id', 'params', 'body', 'generator', 'expression', 'async'],
+    AssignmentExpression: ['type', 'operator', 'left', 'right'],
+    AssignmentPattern: ['type', 'left', 'right'],
+    AwaitExpression: ['type', 'argument'],
+    BinaryExpression: ['type', 'operator', 'left', 'right'],
+    BlockStatement: ['type', 'body'],
+    BreakStatement: ['type', 'label'],
+    CallExpression: ['type', 'callee', 'arguments'],
+    CatchClause: ['type', 'param', 'guard', 'body'],
+    ClassBody: ['type', 'body'],
+    ClassDeclaration: ['type', 'id', 'superClass', 'body'],
+    ClassExpression: ['type', 'id', 'superClass', 'body'],
+    ConditionalExpression: ['type', 'test', 'consequent', 'alternate'],
+    ContinueStatement: ['type', 'label'],
+    DebuggerStatement: ['type'],
+    DoWhileStatement: ['type', 'body', 'test'],
+    EmptyStatement: ['type'],
+    ExportAllDeclaration: ['type', 'source'],
+    ExportDefaultDeclaration: ['type', 'declaration'],
+    ExportNamedDeclaration: ['type', 'declaration', 'specifiers', 'source'],
+    ExportSpecifier: ['type', 'exported', 'local'],
+    ExpressionStatement: ['type', 'expression'],
+    ForInStatement: ['type', 'left', 'right', 'body'],
+    ForOfStatement: ['type', 'left', 'right', 'body'],
+    ForStatement: ['type', 'init', 'test', 'update', 'body'],
+    FunctionDeclaration: ['type', 'id', 'params', 'body', 'generator', 'async'],
+    FunctionExpression: ['type', 'id', 'params', 'body', 'generator', 'async'],
+    Identifier: ['type', 'name'],
+    IfStatement: ['type', 'test', 'consequent', 'alternate'],
+    ImportDeclaration: ['type', 'specifiers', 'source'],
+    ImportDefaultSpecifier: ['type', 'local'],
+    ImportNamespaceSpecifier: ['type', 'local'],
+    ImportSpecifier: ['type', 'imported', 'local'],
+    LabeledStatement: ['type', 'label', 'body'],
+    Literal: ['type', 'value', 'regex'],
+    LogicalExpression: ['type', 'operator', 'left', 'right'],
+    MemberExpression: ['type', 'object', 'property', 'computed'],
+    MetaProperty: ['type', 'meta', 'property'],
+    MethodDefinition: ['type', 'key', 'value', 'kind', 'computed', 'static'],
+    NewExpression: ['type', 'callee', 'arguments'],
+    ObjectExpression: ['type', 'properties'],
+    ObjectPattern: ['type', 'properties'],
+    Program: ['type', 'body', 'sourceType'],
+    Property: ['type', 'key', 'value', 'kind', 'method', 'shorthand', 'computed'],
+    RestElement: ['type', 'argument'],
+    ReturnStatement: ['type', 'argument'],
+    SequenceExpression: ['type', 'expressions'],
+    SpreadElement: ['type', 'argument'],
+    Super: ['type'],
+    SwitchCase: ['type', 'test', 'consequent'],
+    SwitchStatement: ['type', 'discriminant', 'cases', 'lexical'],
+    TaggedTemplateExpression: ['type', 'tag', 'quasi'],
+    TemplateElement: ['type', 'tail', 'value'],
+    TemplateLiteral: ['type', 'quasis', 'expressions'],
+    ThisExpression: ['type'],
+    ThrowStatement: ['type', 'argument'],
+    TryStatement: ['type', 'block', 'handler', 'finalizer'],
+    UnaryExpression: ['type', 'operator', 'prefix', 'argument'],
+    UpdateExpression: ['type', 'operator', 'argument', 'prefix'],
+    VariableDeclaration: ['type', 'declarations', 'kind'],
+    VariableDeclarator: ['type', 'id', 'init'],
+    WhileStatement: ['type', 'test', 'body'],
+    WithStatement: ['type', 'object', 'body'],
+    YieldExpression: ['type', 'argument', 'delegate']
+};
diff --git a/node_modules/espurify/lib/clone-ast.js b/node_modules/espurify/lib/clone-ast.js
new file mode 100644
index 000000000..f748b885d
--- /dev/null
+++ b/node_modules/espurify/lib/clone-ast.js
@@ -0,0 +1,69 @@
+'use strict';
+
+var isArray = require('core-js/library/fn/array/is-array');
+var objectKeys = require('core-js/library/fn/object/keys');
+var indexOf = require('core-js/library/fn/array/index-of');
+var reduce = require('core-js/library/fn/array/reduce');
+
+module.exports = function cloneWithWhitelist (astWhiteList) {
+    var whitelist = reduce(objectKeys(astWhiteList), function (props, key) {
+        var propNames = astWhiteList[key];
+        var prepend = (indexOf(propNames, 'type') === -1) ? ['type'] : [];
+        props[key] = prepend.concat(propNames);
+        return props;
+    }, {});
+
+    function cloneNodeOrObject (obj) {
+        var props = obj.type ? whitelist[obj.type] : null;
+        if (props) {
+            return cloneNode(obj, props);
+        } else {
+            return cloneObject(obj);
+        }
+    }
+
+    function cloneArray (ary) {
+        var i = ary.length, clone = [];
+        while (i--) {
+            clone[i] = cloneOf(ary[i]);
+        }
+        return clone;
+    }
+
+    function cloneNode (node, props) {
+        var i, len, key, clone = {};
+        for (i = 0, len = props.length; i < len; i += 1) {
+            key = props[i];
+            if (node.hasOwnProperty(key)) {
+                clone[key] = cloneOf(node[key]);
+            }
+        }
+        return clone;
+    }
+
+    function cloneObject (obj) {
+        var props = objectKeys(obj);
+        var i, len, key, clone = {};
+        for (i = 0, len = props.length; i < len; i += 1) {
+            key = props[i];
+            clone[key] = cloneOf(obj[key]);
+        }
+        return clone;
+    }
+
+    function cloneOf (val) {
+        if (typeof val === 'object' && val !== null) {
+            if (val instanceof RegExp) {
+                return new RegExp(val);
+            } else if (isArray(val)) {
+                return cloneArray(val);
+            } else {
+                return cloneNodeOrObject(val);
+            }
+        } else {
+            return val;
+        }
+    }
+
+    return cloneNodeOrObject;
+};
diff --git a/node_modules/espurify/lib/create-whitelist.js b/node_modules/espurify/lib/create-whitelist.js
new file mode 100644
index 000000000..b1dbc16a0
--- /dev/null
+++ b/node_modules/espurify/lib/create-whitelist.js
@@ -0,0 +1,17 @@
+'use strict';
+
+var defaultProps = require('./ast-properties');
+var objectKeys = require('core-js/library/fn/object/keys');
+var assign = require('core-js/library/fn/object/assign');
+
+module.exports = function createWhitelist (options) {
+    var opts = assign({}, options);
+    var typeName, i, len;
+    var keys = objectKeys(defaultProps);
+    var result = {};
+    for (i = 0, len = keys.length; i < len; i += 1) {
+        typeName = keys[i];
+        result[typeName] = defaultProps[typeName].concat(opts.extra);
+    }
+    return result;
+};