--- /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;
+ }
+ Rule.prototype.apply = function (sourceFile) {
+ return this.applyWithFunction(sourceFile, walk);
+ };
+ /* tslint:disable:object-literal-sort-keys max-line-length */
+ Rule.metadata = {
+ ruleName: "ban-comma-operator",
+ description: "Disallows the comma operator to be used.",
+ descriptionDetails: "[Read more about the comma operator here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Comma_Operator).",
+ rationale: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n Using the comma operator can create a potential for many non-obvious bugs or lead to misunderstanding of code.\n\n ### Examples\n ```\n foo((bar, baz)); // evaluates to 'foo(baz)' because of the extra parens - confusing and not obvious\n ```\n\n ```\n switch (foo) {\n case 1, 2: // equals 'case 2' - probably intended 'case 1: case2:'\n return true;\n case 3:\n return false;\n }\n ```\n\n ```\n let x = (y = 1, z = 2); // x is equal to 2 - this may not be immediately obvious.\n ```\n "], ["\n Using the comma operator can create a potential for many non-obvious bugs or lead to misunderstanding of code.\n\n ### Examples\n \\`\\`\\`\n foo((bar, baz)); // evaluates to 'foo(baz)' because of the extra parens - confusing and not obvious\n \\`\\`\\`\n\n \\`\\`\\`\n switch (foo) {\n case 1, 2: // equals 'case 2' - probably intended 'case 1: case2:'\n return true;\n case 3:\n return false;\n }\n \\`\\`\\`\n\n \\`\\`\\`\n let x = (y = 1, z = 2); // x is equal to 2 - this may not be immediately obvious.\n \\`\\`\\`\n "]))),
+ options: null,
+ optionsDescription: "",
+ optionExamples: [true],
+ type: "functionality",
+ typescriptOnly: false,
+ };
+ /* tslint:enable:object-literal-sort-keys max-line-length */
+ Rule.FAILURE_STRING = "Do not use comma operator here because it can be easily misunderstood or lead to unintended bugs.";
+ return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+ return ts.forEachChild(ctx.sourceFile, function cb(node) {
+ if (tsutils_1.isBinaryExpression(node) &&
+ node.operatorToken.kind === ts.SyntaxKind.CommaToken &&
+ !isForLoopIncrementor(node)) {
+ ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
+ }
+ return ts.forEachChild(node, cb);
+ });
+}
+function isForLoopIncrementor(node) {
+ var parent = node.parent;
+ return (parent.kind === ts.SyntaxKind.ForStatement &&
+ parent.incrementor === node);
+}
+var templateObject_1;