text: "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 });
  exports.Rule = void 0;
  var tslib_1 = require("tslib");
  var tsutils_1 = require("tsutils");
  var ts = require("typescript");
  var Lint = require("../index");
  var useIsnan_examples_1 = require("./code-examples/useIsnan.examples");
  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: "use-isnan",
          description: "Enforces use of the `isNaN()` function to check for NaN references instead of a comparison to the `NaN` constant.",
          rationale: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n            Since `NaN !== NaN`, comparisons with regular operators will produce unexpected results.\n            So, instead of `if (myVar === NaN)`, do `if (isNaN(myVar))`."], ["\n            Since \\`NaN !== NaN\\`, comparisons with regular operators will produce unexpected results.\n            So, instead of \\`if (myVar === NaN)\\`, do \\`if (isNaN(myVar))\\`."]))),
          optionsDescription: "Not configurable.",
          options: null,
          optionExamples: [true],
          type: "functionality",
          typescriptOnly: false,
          codeExamples: useIsnan_examples_1.codeExamples,
      };
      /* tslint:enable:object-literal-sort-keys */
      Rule.FAILURE_STRING = "Found an invalid comparison for NaN: ";
      return Rule;
  }(Lint.Rules.AbstractRule));
  exports.Rule = Rule;
  function walk(ctx) {
      return ts.forEachChild(ctx.sourceFile, function cb(node) {
          if (tsutils_1.isBinaryExpression(node)) {
              switch (node.operatorToken.kind) {
                  case ts.SyntaxKind.LessThanToken:
                  case ts.SyntaxKind.GreaterThanToken:
                  case ts.SyntaxKind.LessThanEqualsToken:
                  case ts.SyntaxKind.GreaterThanEqualsToken:
                  case ts.SyntaxKind.EqualsEqualsToken:
                  case ts.SyntaxKind.ExclamationEqualsToken:
                  case ts.SyntaxKind.EqualsEqualsEqualsToken:
                  case ts.SyntaxKind.ExclamationEqualsEqualsToken:
                      if (isExpressionNaN(node.right) || isExpressionNaN(node.left)) {
                          ctx.addFailureAtNode(node, Rule.FAILURE_STRING + node.getText(ctx.sourceFile));
                      }
              }
          }
          return ts.forEachChild(node, cb);
      });
  }
  function isExpressionNaN(node) {
      return node.kind === ts.SyntaxKind.Identifier && node.text === "NaN";
  }
  var templateObject_1;
  