Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/useIsnanRule.js

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+"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_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;