--- /dev/null
+"use strict";
+/**
+ * @license
+ * Copyright 2013 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 = require("tsutils");
+var ts = require("typescript");
+var Lint = require("../index");
+var LEGAL_TYPEOF_RESULTS = new Set([
+ "undefined",
+ "string",
+ "boolean",
+ "number",
+ "function",
+ "object",
+ "symbol",
+]);
+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 */
+ Rule.metadata = {
+ ruleName: "typeof-compare",
+ description: "Makes sure result of `typeof` is compared to correct string values",
+ optionsDescription: "Not configurable.",
+ options: null,
+ optionExamples: [true],
+ type: "functionality",
+ typescriptOnly: false,
+ deprecationMessage: !/^2\.1\./.test(ts.version)
+ ? "Starting from TypeScript 2.2 the compiler includes this check which makes this rule redundant."
+ : "",
+ };
+ /* tslint:enable:object-literal-sort-keys */
+ Rule.FAILURE_STRING = "'typeof' expression must be compared to one of: " + Array.from(LEGAL_TYPEOF_RESULTS)
+ .map(function (x) { return "\"" + x + "\""; })
+ .join(", ");
+ return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+ ts.forEachChild(ctx.sourceFile, function cb(node) {
+ if (tsutils.isBinaryExpression(node)) {
+ var operatorToken = node.operatorToken, left = node.left, right = node.right;
+ if (Lint.getEqualsKind(operatorToken) !== undefined &&
+ (isFaultyTypeof(left, right) || isFaultyTypeof(right, left))) {
+ ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
+ }
+ }
+ ts.forEachChild(node, cb);
+ });
+}
+function isFaultyTypeof(left, right) {
+ return left.kind === ts.SyntaxKind.TypeOfExpression && isFaultyTypeofResult(right);
+}
+function isFaultyTypeofResult(node) {
+ switch (node.kind) {
+ case ts.SyntaxKind.StringLiteral:
+ return !LEGAL_TYPEOF_RESULTS.has(node.text);
+ case ts.SyntaxKind.Identifier:
+ return node.originalKeywordKind === ts.SyntaxKind.UndefinedKeyword;
+ case ts.SyntaxKind.NullKeyword:
+ case ts.SyntaxKind.NumericLiteral:
+ case ts.SyntaxKind.TrueKeyword:
+ case ts.SyntaxKind.FalseKeyword:
+ case ts.SyntaxKind.ObjectLiteralExpression:
+ case ts.SyntaxKind.ArrayLiteralExpression:
+ return true;
+ default:
+ return false;
+ }
+}