--- /dev/null
+"use strict";
+/**
+ * @license
+ * Copyright 2019 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.FAILURE_STRING_FACTORY = function () {
+ return "Use a for...of statement instead of for...in. If iterating over an object, use Object.keys() to access its enumerable keys.";
+ };
+ Rule.prototype.apply = function (sourceFile) {
+ return this.applyWithFunction(sourceFile, walk);
+ };
+ Rule.metadata = {
+ description: "Ban the usage of for...in statements.",
+ optionExamples: [true],
+ options: null,
+ optionsDescription: "Not configurable.",
+ rationale: "for...in statements are legacy JavaScript syntax which usually require a verbose `hasOwnProperty` check inside their loop body. These statements can be fully replaced with for...of statements in modern JS & TS.",
+ ruleName: "no-for-in",
+ type: "typescript",
+ typescriptOnly: false,
+ };
+ return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+ function cb(node) {
+ if (tsutils_1.isForInStatement(node)) {
+ var msg = Rule.FAILURE_STRING_FACTORY();
+ ctx.addFailureAt(node.getStart(), node.getWidth(), msg);
+ }
+ return ts.forEachChild(node, cb);
+ }
+ return ts.forEachChild(ctx.sourceFile, cb);
+}