onlyArrowFunctionsRule.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 Lint = require("../lint");
var OPTION_ALLOW_DECLARATIONS = "allow-declarations";
var Rule = (function (_super) {
__extends(Rule, _super);
function Rule() {
_super.apply(this, arguments);
}
Rule.prototype.apply = function (sourceFile) {
return this.applyWithWalker(new OnlyArrowFunctionsWalker(sourceFile, this.getOptions()));
};
Rule.metadata = {
ruleName: "only-arrow-functions",
description: "Disallows traditional (non-arrow) function expressions.",
rationale: "Traditional functions don't bind lexical scope, which can lead to unexpected behavior when accessing 'this'.",
optionsDescription: (_a = ["\n One argument may be optionally provided:\n\n * `\"", "\"` allows standalone function declarations.\n "], _a.raw = ["\n One argument may be optionally provided:\n\n * \\`\"", "\"\\` allows standalone function declarations.\n "], Lint.Utils.dedent(_a, OPTION_ALLOW_DECLARATIONS)),
options: {
type: "array",
items: {
type: "string",
enum: [OPTION_ALLOW_DECLARATIONS],
},
minLength: 0,
maxLength: 1,
},
optionExamples: ["true", ("[true, \"" + OPTION_ALLOW_DECLARATIONS + "\"]")],
type: "typescript",
};
Rule.FAILURE_STRING = "non-arrow functions are forbidden";
return Rule;
var _a;
}(Lint.Rules.AbstractRule));
exports.Rule = Rule;
var OnlyArrowFunctionsWalker = (function (_super) {
__extends(OnlyArrowFunctionsWalker, _super);
function OnlyArrowFunctionsWalker() {
_super.apply(this, arguments);
}
OnlyArrowFunctionsWalker.prototype.visitFunctionDeclaration = function (node) {
if (!this.hasOption(OPTION_ALLOW_DECLARATIONS)) {
this.addFailure(this.createFailure(node.getStart(), "function".length, Rule.FAILURE_STRING));
}
_super.prototype.visitFunctionDeclaration.call(this, node);
};
OnlyArrowFunctionsWalker.prototype.visitFunctionExpression = function (node) {
this.addFailure(this.createFailure(node.getStart(), "function".length, Rule.FAILURE_STRING));
_super.prototype.visitFunctionExpression.call(this, node);
};
return OnlyArrowFunctionsWalker;
}(Lint.RuleWalker));