Initial commit (from f5274cbdce4ae7c9e4b937dcdf95ac70ae436d5f)

node_modules/tslint/lib/rules/noUnnecessaryCallbackWrapperRule.js

@@ -0,0 +1,93 @@
+"use strict";
+/**
+ * @license
+ * Copyright 2017 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 noUnnecessaryCallbackWrapper_examples_1 = require("./code-examples/noUnnecessaryCallbackWrapper.examples");
+var Rule = /** @class */ (function (_super) {
+    tslib_1.__extends(Rule, _super);
+    function Rule() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    /* tslint:enable:object-literal-sort-keys */
+    Rule.FAILURE_STRING = function (cbText) {
+        return "No need to wrap '" + cbText + "' in another function. Just use it directly.";
+    };
+    Rule.prototype.apply = function (sourceFile) {
+        return this.applyWithFunction(sourceFile, walk);
+    };
+    /* tslint:disable:object-literal-sort-keys */
+    Rule.metadata = {
+        ruleName: "no-unnecessary-callback-wrapper",
+        description: Lint.Utils.dedent(templateObject_1 || (templateObject_1 = tslib_1.__makeTemplateObject(["\n            Replaces `x => f(x)` with just `f`.\n            To catch more cases, enable `only-arrow-functions` and `arrow-return-shorthand` too."], ["\n            Replaces \\`x => f(x)\\` with just \\`f\\`.\n            To catch more cases, enable \\`only-arrow-functions\\` and \\`arrow-return-shorthand\\` too."]))),
+        optionsDescription: "Not configurable.",
+        options: null,
+        optionExamples: [true],
+        rationale: Lint.Utils.dedent(templateObject_2 || (templateObject_2 = tslib_1.__makeTemplateObject(["\n            There's generally no reason to wrap a function with a callback wrapper if it's directly called anyway.\n            Doing so creates extra inline lambdas that slow the runtime down.\n        "], ["\n            There's generally no reason to wrap a function with a callback wrapper if it's directly called anyway.\n            Doing so creates extra inline lambdas that slow the runtime down.\n        "]))),
+        type: "style",
+        typescriptOnly: false,
+        codeExamples: noUnnecessaryCallbackWrapper_examples_1.codeExamples,
+    };
+    return Rule;
+}(Lint.Rules.AbstractRule));
+exports.Rule = Rule;
+function walk(ctx) {
+    return ts.forEachChild(ctx.sourceFile, cb);
+    function cb(node) {
+        if (tsutils_1.isArrowFunction(node) &&
+            !tsutils_1.hasModifier(node.modifiers, ts.SyntaxKind.AsyncKeyword) &&
+            tsutils_1.isCallExpression(node.body) &&
+            tsutils_1.isIdentifier(node.body.expression) &&
+            isRedundantCallback(node.parameters, node.body.arguments, node.body.expression)) {
+            var start = node.getStart(ctx.sourceFile);
+            ctx.addFailure(start, node.end, Rule.FAILURE_STRING(node.body.expression.text), [
+                Lint.Replacement.deleteFromTo(start, node.body.getStart(ctx.sourceFile)),
+                Lint.Replacement.deleteFromTo(node.body.expression.end, node.end),
+            ]);
+        }
+        else {
+            return ts.forEachChild(node, cb);
+        }
+    }
+}
+function isRedundantCallback(parameters, args, expression) {
+    if (parameters.length !== args.length) {
+        return false;
+    }
+    for (var i = 0; i < parameters.length; ++i) {
+        var _a = parameters[i], dotDotDotToken = _a.dotDotDotToken, name = _a.name;
+        var arg = args[i];
+        if (dotDotDotToken !== undefined) {
+            if (!tsutils_1.isSpreadElement(arg)) {
+                return false;
+            }
+            arg = arg.expression;
+        }
+        if (!tsutils_1.isIdentifier(name) ||
+            !tsutils_1.isIdentifier(arg) ||
+            name.text !== arg.text ||
+            // If the invoked expression is one of the parameters, bail.
+            expression.text === name.text) {
+            return false;
+        }
+    }
+    return true;
+}
+var templateObject_1, templateObject_2;