Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/noEmptyInterfaceRule.js

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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 noEmptyInterface_examples_1 = require("./code-examples/noEmptyInterface.examples");
+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,
+        codeExamples: noEmptyInterface_examples_1.codeExamples,
+    };
+    /* 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
+    }
+}