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node_modules/tslint/lib/rules/noNullKeywordRule.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");
+// with due reference to https://github.com/Microsoft/TypeScript/blob/7813121c4d77e50aad0eed3152ef1f1156c7b574/scripts/tslint/noNullRule.ts
+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.prototype.apply = function (sourceFile) {
+        return this.applyWithFunction(sourceFile, walk);
+    };
+    /* tslint:disable:object-literal-sort-keys */
+    Rule.metadata = {
+        ruleName: "no-null-keyword",
+        description: "Disallows use of the `null` keyword literal.",
+        rationale: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n            Instead of having the dual concepts of `null` and`undefined` in a codebase,\n            this rule ensures that only `undefined` is used.\n\n            JavaScript originally intended `undefined` to refer to a value that doesn't yet exist,\n            while `null` was meant to refer to a value that does exist but points to nothing.\n            That's confusing.\n            `undefined` is the default value when object members don't exist, and is the return value\n            for newer native collection APIs such as `Map.get` when collection values don't exist.\n\n            ```\n            const myObject = {};\n            myObject.doesNotExist; // undefined\n            ```\n\n            ```\n            const myMap = new Map<string, number>();\n            myMap.get(\"doesNotExist\"); // undefined\n            ```\n\n            To remove confusion over the two similar values, it's better to stick with just `undefined`.\n        "], ["\n            Instead of having the dual concepts of \\`null\\` and\\`undefined\\` in a codebase,\n            this rule ensures that only \\`undefined\\` is used.\n\n            JavaScript originally intended \\`undefined\\` to refer to a value that doesn't yet exist,\n            while \\`null\\` was meant to refer to a value that does exist but points to nothing.\n            That's confusing.\n            \\`undefined\\` is the default value when object members don't exist, and is the return value\n            for newer native collection APIs such as \\`Map.get\\` when collection values don't exist.\n\n            \\`\\`\\`\n            const myObject = {};\n            myObject.doesNotExist; // undefined\n            \\`\\`\\`\n\n            \\`\\`\\`\n            const myMap = new Map<string, number>();\n            myMap.get(\"doesNotExist\"); // undefined\n            \\`\\`\\`\n\n            To remove confusion over the two similar values, it's better to stick with just \\`undefined\\`.\n        "]))),
+        optionsDescription: "Not configurable.",
+        options: null,
+        optionExamples: [true],
+        type: "functionality",
+        typescriptOnly: false,
+        hasFix: true,
+    };
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING = "Use 'undefined' instead of 'null'";
+    return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+    return ts.forEachChild(ctx.sourceFile, cb);
+    function cb(node) {
+        if (tsutils_1.isTypeNodeKind(node.kind)) {
+            return; // skip type nodes
+        }
+        if (node.kind !== ts.SyntaxKind.NullKeyword) {
+            return ts.forEachChild(node, cb);
+        }
+        var parent = node.parent;
+        var eq;
+        if (tsutils_1.isBinaryExpression(parent)) {
+            eq = Lint.getEqualsKind(parent.operatorToken);
+        }
+        if (eq === undefined) {
+            ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
+        }
+        else if (!eq.isStrict) {
+            ctx.addFailureAtNode(node, Rule.FAILURE_STRING, Lint.Replacement.replaceNode(node, "undefined", ctx.sourceFile));
+        }
+    }
+}
+var templateObject_1;