"use strict";
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/**
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* @license
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* Copyright 2013 Palantir Technologies, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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var tslib_1 = require("tslib");
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var tsutils = require("tsutils");
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var ts = require("typescript");
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var Lint = require("../index");
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var LEGAL_TYPEOF_RESULTS = new Set([
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"undefined",
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"string",
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"boolean",
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"number",
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"function",
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"object",
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"symbol",
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]);
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var Rule = /** @class */ (function (_super) {
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tslib_1.__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk);
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};
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "typeof-compare",
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description: "Makes sure result of `typeof` is compared to correct string values",
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "functionality",
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typescriptOnly: false,
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deprecationMessage: !/^2\.1\./.test(ts.version)
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? "Starting from TypeScript 2.2 the compiler includes this check which makes this rule redundant."
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: "",
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "'typeof' expression must be compared to one of: " + Array.from(LEGAL_TYPEOF_RESULTS)
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.map(function (x) { return "\"" + x + "\""; })
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.join(", ");
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return Rule;
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}(Lint.Rules.AbstractRule));
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exports.Rule = Rule;
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function walk(ctx) {
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ts.forEachChild(ctx.sourceFile, function cb(node) {
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if (tsutils.isBinaryExpression(node)) {
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var operatorToken = node.operatorToken, left = node.left, right = node.right;
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if (Lint.getEqualsKind(operatorToken) !== undefined &&
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(isFaultyTypeof(left, right) || isFaultyTypeof(right, left))) {
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ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
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}
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}
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ts.forEachChild(node, cb);
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});
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}
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function isFaultyTypeof(left, right) {
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return left.kind === ts.SyntaxKind.TypeOfExpression && isFaultyTypeofResult(right);
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}
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function isFaultyTypeofResult(node) {
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switch (node.kind) {
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case ts.SyntaxKind.StringLiteral:
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return !LEGAL_TYPEOF_RESULTS.has(node.text);
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case ts.SyntaxKind.Identifier:
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return node.originalKeywordKind === ts.SyntaxKind.UndefinedKeyword;
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case ts.SyntaxKind.NullKeyword:
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case ts.SyntaxKind.NumericLiteral:
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case ts.SyntaxKind.TrueKeyword:
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case ts.SyntaxKind.FalseKeyword:
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case ts.SyntaxKind.ObjectLiteralExpression:
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case ts.SyntaxKind.ArrayLiteralExpression:
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return true;
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default:
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return false;
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}
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}
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