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node_modules/tslint/lib/rules/noForInRule.js

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+"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);
+}