68 lines
2.7 KiB
JavaScript
68 lines
2.7 KiB
JavaScript
"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 = /** @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-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.";
|
|
return Rule;
|
|
}(Lint.Rules.AbstractRule));
|
|
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 || extendsOneTypeWithoutTypeArguments(node.heritageClauses[0]))) {
|
|
return ctx.addFailureAtNode(node.name, node.heritageClauses !== undefined ? Rule.FAILURE_STRING_FOR_EXTENDS : Rule.FAILURE_STRING);
|
|
}
|
|
return ts.forEachChild(node, cb);
|
|
});
|
|
}
|
|
function extendsOneTypeWithoutTypeArguments(_a) {
|
|
var types = _a.types;
|
|
switch (types.length) {
|
|
case 0:
|
|
return true; // don't crash on empty extends list
|
|
case 1:
|
|
return types[0].typeArguments === undefined; // allow interfaces that provide type arguments for the extended type
|
|
default:
|
|
return false; // allow interfaces extending more than one types
|
|
}
|
|
}
|