1 files changed, 105 insertions, 0 deletions
diff --git a/node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js b/node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js
new file mode 100644
index 000000000..b147fe076
--- /dev/null
+++ b/node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js
@@ -0,0 +1,105 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2017 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");
+var tsutils_1 = require("tsutils");
+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;
+    }
+    Rule.prototype.apply = function (sourceFile) {
+        return this.applyWithFunction(sourceFile, walk);
+    };
+    return Rule;
+}(Lint.Rules.AbstractRule));
+/* tslint:disable:object-literal-sort-keys */
+Rule.metadata = {
+    ruleName: "no-unnecessary-initializer",
+    description: "Forbids a 'var'/'let' statement or destructuring initializer to be initialized to 'undefined'.",
+    hasFix: true,
+    optionsDescription: "Not configurable.",
+    options: null,
+    optionExamples: [true],
+    type: "style",
+    typescriptOnly: false,
+};
+/* tslint:enable:object-literal-sort-keys */
+Rule.FAILURE_STRING = "Unnecessary initialization to 'undefined'.";
+Rule.FAILURE_STRING_PARAMETER = "Use an optional parameter instead of initializing to 'undefined'. " +
+    "Also, the type declaration does not need to include '| undefined'.";
+exports.Rule = Rule;
+function walk(ctx) {
+    ts.forEachChild(ctx.sourceFile, function cb(node) {
+        switch (node.kind) {
+            case ts.SyntaxKind.BindingElement:
+                checkInitializer(node);
+                break;
+            case ts.SyntaxKind.VariableDeclaration:
+                if (!tsutils_1.isBindingPattern(node.name) && !Lint.isNodeFlagSet(node.parent, ts.NodeFlags.Const)) {
+                    checkInitializer(node);
+                }
+                break;
+            case ts.SyntaxKind.MethodDeclaration:
+            case ts.SyntaxKind.FunctionDeclaration:
+            case ts.SyntaxKind.Constructor: {
+                var parameters_1 = node.parameters;
+                parameters_1.forEach(function (parameter, i) {
+                    if (isUndefined(parameter.initializer)) {
+                        if (parametersAllOptionalAfter(parameters_1, i)) {
+                            // No fix since they may want to remove '| undefined' from the type.
+                            ctx.addFailureAtNode(parameter, Rule.FAILURE_STRING_PARAMETER);
+                        }
+                        else {
+                            failWithFix(parameter);
+                        }
+                    }
+                });
+                break;
+            }
+        }
+        ts.forEachChild(node, cb);
+    });
+    function checkInitializer(node) {
+        if (isUndefined(node.initializer)) {
+            failWithFix(node);
+        }
+    }
+    function failWithFix(node) {
+        var fix = Lint.Replacement.deleteFromTo(Lint.childOfKind(node, ts.SyntaxKind.EqualsToken).pos, node.end);
+        ctx.addFailureAtNode(node, Rule.FAILURE_STRING, fix);
+    }
+}
+function parametersAllOptionalAfter(parameters, idx) {
+    for (var i = idx + 1; i < parameters.length; i++) {
+        if (parameters[i].questionToken !== undefined) {
+            return true;
+        }
+        if (parameters[i].initializer === undefined) {
+            return false;
+        }
+    }
+    return true;
+}
+function isUndefined(node) {
+    return node !== undefined &&
+        node.kind === ts.SyntaxKind.Identifier &&
+        node.originalKeywordKind === ts.SyntaxKind.UndefinedKeyword;
+}