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73 lines
2.9 KiB
JavaScript
73 lines
2.9 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2013 Palantir Technologies, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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var tslib_1 = require("tslib");
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var tsutils_1 = require("tsutils");
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var ts = require("typescript");
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var Lint = require("../index");
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var noEmptyInterface_examples_1 = require("./code-examples/noEmptyInterface.examples");
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var Rule = /** @class */ (function (_super) {
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tslib_1.__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk);
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};
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "no-empty-interface",
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description: "Forbids empty interfaces.",
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rationale: "An empty interface is equivalent to its supertype (or `{}`).",
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optionsDescription: "Not configurable.",
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options: null,
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type: "typescript",
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typescriptOnly: true,
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codeExamples: noEmptyInterface_examples_1.codeExamples,
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};
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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = "An empty interface is equivalent to `{}`.";
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Rule.FAILURE_STRING_FOR_EXTENDS = "An interface declaring no members is equivalent to its supertype.";
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return Rule;
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}(Lint.Rules.AbstractRule));
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exports.Rule = Rule;
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function walk(ctx) {
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return ts.forEachChild(ctx.sourceFile, function cb(node) {
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if (tsutils_1.isInterfaceDeclaration(node) &&
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node.members.length === 0 &&
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(node.heritageClauses === undefined ||
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extendsOneTypeWithoutTypeArguments(node.heritageClauses[0]))) {
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return ctx.addFailureAtNode(node.name, node.heritageClauses !== undefined
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? Rule.FAILURE_STRING_FOR_EXTENDS
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: Rule.FAILURE_STRING);
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}
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return ts.forEachChild(node, cb);
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});
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}
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function extendsOneTypeWithoutTypeArguments(_a) {
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var types = _a.types;
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switch (types.length) {
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case 0:
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return true; // don't crash on empty extends list
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case 1:
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return types[0].typeArguments === undefined; // allow interfaces that provide type arguments for the extended type
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default:
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return false; // allow interfaces extending more than one types
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}
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}
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