noNullKeywordRule.js
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"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var ts = require("typescript");
var Lint = require("../lint");
var Rule = (function (_super) {
__extends(Rule, _super);
function Rule() {
_super.apply(this, arguments);
}
Rule.prototype.apply = function (sourceFile) {
return this.applyWithWalker(new NullWalker(sourceFile, this.getOptions()));
};
Rule.metadata = {
ruleName: "no-null-keyword",
description: "Disallows use of the `null` keyword literal.",
rationale: (_a = ["\n Instead of having the dual concepts of `null` and`undefined` in a codebase,\n this rule ensures that only `undefined` is used."], _a.raw = ["\n Instead of having the dual concepts of \\`null\\` and\\`undefined\\` in a codebase,\n this rule ensures that only \\`undefined\\` is used."], Lint.Utils.dedent(_a)),
optionsDescription: "Not configurable.",
options: null,
optionExamples: ["true"],
type: "functionality",
};
Rule.FAILURE_STRING = "Use 'undefined' instead of 'null'";
return Rule;
var _a;
}(Lint.Rules.AbstractRule));
exports.Rule = Rule;
var NullWalker = (function (_super) {
__extends(NullWalker, _super);
function NullWalker() {
_super.apply(this, arguments);
}
NullWalker.prototype.visitNode = function (node) {
_super.prototype.visitNode.call(this, node);
if (node.kind === ts.SyntaxKind.NullKeyword) {
this.addFailure(this.createFailure(node.getStart(), node.getWidth(), Rule.FAILURE_STRING));
}
};
return NullWalker;
}(Lint.RuleWalker));