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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 Rule = (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);
};
return Rule;
}(Lint.Rules.AbstractRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
ruleName: "no-empty-interface",
description: "Forbids empty interfaces.",
rationale: "An empty interface is equivalent to its supertype (or `{}`).",
optionsDescription: "Not configurable.",
options: null,
type: "typescript",
typescriptOnly: true,
};
/* tslint:enable:object-literal-sort-keys */
Rule.FAILURE_STRING = "An empty interface is equivalent to `{}`.";
Rule.FAILURE_STRING_FOR_EXTENDS = "An interface declaring no members is equivalent to its supertype.";
exports.Rule = Rule;
function walk(ctx) {
return ts.forEachChild(ctx.sourceFile, function cb(node) {
if (tsutils_1.isInterfaceDeclaration(node) &&
node.members.length === 0 &&
(node.heritageClauses === undefined ||
node.heritageClauses[0].types === undefined ||
// allow interfaces that extend 2 or more interfaces
node.heritageClauses[0].types.length < 2)) {
return ctx.addFailureAtNode(node.name, node.heritageClauses !== undefined ? Rule.FAILURE_STRING_FOR_EXTENDS : Rule.FAILURE_STRING);
}
return ts.forEachChild(node, cb);
});
}
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