1 files changed, 143 insertions, 0 deletions
diff --git a/node_modules/tslint/lib/rules/noShadowedVariableRule.js b/node_modules/tslint/lib/rules/noShadowedVariableRule.js
new file mode 100644
index 000000000..53b3db09d
--- /dev/null
+++ b/node_modules/tslint/lib/rules/noShadowedVariableRule.js
@@ -0,0 +1,143 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2013 Palantir Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+Object.defineProperty(exports, "__esModule", { value: true });
+var tslib_1 = require("tslib");
+// tslint:disable deprecation
+// (https://github.com/palantir/tslint/pull/2598)
+var ts = require("typescript");
+var Lint = require("../index");
+var Rule = (function (_super) {
+    tslib_1.__extends(Rule, _super);
+    function Rule() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING_FACTORY = function (name) {
+        return "Shadowed variable: '" + name + "'";
+    };
+    Rule.prototype.apply = function (sourceFile) {
+        return this.applyWithWalker(new NoShadowedVariableWalker(sourceFile, this.getOptions()));
+    };
+    return Rule;
+}(Lint.Rules.AbstractRule));
+/* tslint:disable:object-literal-sort-keys */
+Rule.metadata = {
+    ruleName: "no-shadowed-variable",
+    description: "Disallows shadowing variable declarations.",
+    rationale: "Shadowing a variable masks access to it and obscures to what value an identifier actually refers.",
+    optionsDescription: "Not configurable.",
+    options: null,
+    optionExamples: [true],
+    type: "functionality",
+    typescriptOnly: false,
+};
+exports.Rule = Rule;
+var NoShadowedVariableWalker = (function (_super) {
+    tslib_1.__extends(NoShadowedVariableWalker, _super);
+    function NoShadowedVariableWalker() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    NoShadowedVariableWalker.prototype.createScope = function () {
+        return new Set();
+    };
+    NoShadowedVariableWalker.prototype.createBlockScope = function () {
+        return new Set();
+    };
+    NoShadowedVariableWalker.prototype.visitBindingElement = function (node) {
+        var isSingleVariable = node.name.kind === ts.SyntaxKind.Identifier;
+        if (isSingleVariable) {
+            var name = node.name;
+            var variableDeclaration = Lint.getBindingElementVariableDeclaration(node);
+            var isBlockScopedVariable = variableDeclaration !== null && Lint.isBlockScopedVariable(variableDeclaration);
+            this.handleSingleVariableIdentifier(name, isBlockScopedVariable);
+        }
+        _super.prototype.visitBindingElement.call(this, node);
+    };
+    NoShadowedVariableWalker.prototype.visitCatchClause = function (node) {
+        // don't visit the catch clause variable declaration, just visit the block
+        // the catch clause variable declaration has its own special scoping rules
+        this.visitBlock(node.block);
+    };
+    NoShadowedVariableWalker.prototype.visitCallSignature = function (_node) {
+        // don't call super, we don't need to check parameter names in call signatures
+    };
+    NoShadowedVariableWalker.prototype.visitFunctionType = function (_node) {
+        // don't call super, we don't need to check names in function types
+    };
+    NoShadowedVariableWalker.prototype.visitConstructorType = function (_node) {
+        // don't call super, we don't need to check names in constructor types
+    };
+    NoShadowedVariableWalker.prototype.visitIndexSignatureDeclaration = function (_node) {
+        // don't call super, we don't want to walk index signatures
+    };
+    NoShadowedVariableWalker.prototype.visitMethodSignature = function (_node) {
+        // don't call super, we don't want to walk method signatures either
+    };
+    NoShadowedVariableWalker.prototype.visitParameterDeclaration = function (node) {
+        var isSingleParameter = node.name.kind === ts.SyntaxKind.Identifier;
+        if (isSingleParameter) {
+            this.handleSingleVariableIdentifier(node.name, false);
+        }
+        _super.prototype.visitParameterDeclaration.call(this, node);
+    };
+    NoShadowedVariableWalker.prototype.visitTypeLiteral = function (_node) {
+        // don't call super, we don't want to walk the inside of type nodes
+    };
+    NoShadowedVariableWalker.prototype.visitVariableDeclaration = function (node) {
+        var isSingleVariable = node.name.kind === ts.SyntaxKind.Identifier;
+        if (isSingleVariable) {
+            this.handleSingleVariableIdentifier(node.name, Lint.isBlockScopedVariable(node));
+        }
+        _super.prototype.visitVariableDeclaration.call(this, node);
+    };
+    NoShadowedVariableWalker.prototype.handleSingleVariableIdentifier = function (variableIdentifier, isBlockScoped) {
+        var variableName = variableIdentifier.text;
+        if (this.isVarInCurrentScope(variableName) && !this.inCurrentBlockScope(variableName)) {
+            // shadowing if there's already a `var` of the same name in the scope AND
+            // it's not in the current block (handled by the 'no-duplicate-variable' rule)
+            this.addFailureOnIdentifier(variableIdentifier);
+        }
+        else if (this.inPreviousBlockScope(variableName)) {
+            // shadowing if there is a `var`, `let`, 'const`, or parameter in a previous block scope
+            this.addFailureOnIdentifier(variableIdentifier);
+        }
+        if (!isBlockScoped) {
+            // `var` variables go on the scope
+            this.getCurrentScope().add(variableName);
+        }
+        // all variables go on block scope, including `var`
+        this.getCurrentBlockScope().add(variableName);
+    };
+    NoShadowedVariableWalker.prototype.isVarInCurrentScope = function (varName) {
+        return this.getCurrentScope().has(varName);
+    };
+    NoShadowedVariableWalker.prototype.inCurrentBlockScope = function (varName) {
+        return this.getCurrentBlockScope().has(varName);
+    };
+    NoShadowedVariableWalker.prototype.inPreviousBlockScope = function (varName) {
+        var _this = this;
+        return this.getAllBlockScopes().some(function (scopeInfo) {
+            return scopeInfo !== _this.getCurrentBlockScope() && scopeInfo.has(varName);
+        });
+    };
+    NoShadowedVariableWalker.prototype.addFailureOnIdentifier = function (ident) {
+        var failureString = Rule.FAILURE_STRING_FACTORY(ident.text);
+        this.addFailureAtNode(ident, failureString);
+    };
+    return NoShadowedVariableWalker;
+}(Lint.BlockScopeAwareRuleWalker));