noDefaultExportRule.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 NoDefaultExportWalker(sourceFile, this.getOptions()));
};
Rule.metadata = {
ruleName: "no-default-export",
description: "Disallows default exports in ES6-style modules.",
descriptionDetails: "Use named exports instead.",
rationale: (_a = ["\n Named imports/exports [promote clarity](https://github.com/palantir/tslint/issues/1182#issue-151780453).\n In addition, current tooling differs on the correct way to handle default imports/exports.\n Avoiding them all together can help avoid tooling bugs and conflicts."], _a.raw = ["\n Named imports/exports [promote clarity](https://github.com/palantir/tslint/issues/1182#issue-151780453).\n In addition, current tooling differs on the correct way to handle default imports/exports.\n Avoiding them all together can help avoid tooling bugs and conflicts."], Lint.Utils.dedent(_a)),
optionsDescription: "Not configurable.",
options: null,
optionExamples: ["true"],
type: "maintainability",
};
Rule.FAILURE_STRING = "Use of default exports is forbidden";
return Rule;
var _a;
}(Lint.Rules.AbstractRule));
exports.Rule = Rule;
var NoDefaultExportWalker = (function (_super) {
__extends(NoDefaultExportWalker, _super);
function NoDefaultExportWalker() {
_super.apply(this, arguments);
}
NoDefaultExportWalker.prototype.visitExportAssignment = function (node) {
var exportMember = node.getChildAt(1);
if (exportMember != null && exportMember.kind === ts.SyntaxKind.DefaultKeyword) {
this.addFailure(this.createFailure(exportMember.getStart(), exportMember.getWidth(), Rule.FAILURE_STRING));
}
_super.prototype.visitExportAssignment.call(this, node);
};
NoDefaultExportWalker.prototype.visitNode = function (node) {
if (node.kind === ts.SyntaxKind.DefaultKeyword && node.parent != null) {
var nodes = node.parent.modifiers;
if (nodes != null &&
nodes.length === 2 &&
nodes[0].kind === ts.SyntaxKind.ExportKeyword &&
nodes[1].kind === ts.SyntaxKind.DefaultKeyword) {
this.addFailure(this.createFailure(nodes[1].getStart(), nodes[1].getWidth(), Rule.FAILURE_STRING));
}
}
_super.prototype.visitNode.call(this, node);
};
return NoDefaultExportWalker;
}(Lint.RuleWalker));