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node_modules/tslint/lib/rules/noParameterReassignmentRule.js

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+"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;
+    }
+}