--- /dev/null
+"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 = /** @class */ (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 = function (name) {
+ return "Reassigning parameter '" + name + "' is forbidden.";
+ };
+ Rule.prototype.apply = function (sourceFile) {
+ return this.applyWithFunction(sourceFile, walk);
+ };
+ /* tslint:disable:object-literal-sort-keys */
+ Rule.metadata = {
+ ruleName: "no-parameter-reassignment",
+ description: "Disallows reassigning parameters.",
+ optionsDescription: "Not configurable.",
+ options: null,
+ optionExamples: [true],
+ type: "typescript",
+ typescriptOnly: false,
+ };
+ return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+ tsutils_1.collectVariableUsage(ctx.sourceFile).forEach(function (variable, identifier) {
+ if (!isParameter(identifier.parent)) {
+ return;
+ }
+ for (var _i = 0, _a = variable.uses; _i < _a.length; _i++) {
+ var use = _a[_i];
+ if (tsutils_1.isReassignmentTarget(use.location)) {
+ ctx.addFailureAtNode(use.location, Rule.FAILURE_STRING(identifier.text));
+ }
+ }
+ });
+}
+function isParameter(node) {
+ switch (node.kind) {
+ case ts.SyntaxKind.Parameter:
+ return true;
+ case ts.SyntaxKind.BindingElement:
+ return (tsutils_1.getDeclarationOfBindingElement(node).kind ===
+ ts.SyntaxKind.Parameter);
+ default:
+ return false;
+ }
+}