86 lines
3.5 KiB
JavaScript
86 lines
3.5 KiB
JavaScript
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"use strict";
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/**
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* @license
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* Copyright 2017 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 Rule = (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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/* tslint:enable:object-literal-sort-keys */
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Rule.FAILURE_STRING = function (cbText) {
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return "No need to wrap '" + cbText + "' in another function. Just use it directly.";
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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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return Rule;
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}(Lint.Rules.AbstractRule));
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/* tslint:disable:object-literal-sort-keys */
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Rule.metadata = {
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ruleName: "no-unnecessary-callback-wrapper",
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description: (_a = ["\n Replaces `x => f(x)` with just `f`.\n To catch more cases, enable `only-arrow-functions` and `arrow-return-shorthand` too."], _a.raw = ["\n Replaces \\`x => f(x)\\` with just \\`f\\`.\n To catch more cases, enable \\`only-arrow-functions\\` and \\`arrow-return-shorthand\\` too."], Lint.Utils.dedent(_a)),
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "style",
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typescriptOnly: false,
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};
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exports.Rule = Rule;
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function walk(ctx) {
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return ts.forEachChild(ctx.sourceFile, cb);
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function cb(node) {
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if (tsutils_1.isArrowFunction(node) && !tsutils_1.hasModifier(node.modifiers, ts.SyntaxKind.AsyncKeyword) &&
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tsutils_1.isCallExpression(node.body) && tsutils_1.isIdentifier(node.body.expression) &&
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isRedundantCallback(node.parameters, node.body.arguments, node.body.expression)) {
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var start = node.getStart(ctx.sourceFile);
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ctx.addFailure(start, node.end, Rule.FAILURE_STRING(node.body.expression.text), [
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Lint.Replacement.deleteFromTo(start, node.body.getStart(ctx.sourceFile)),
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Lint.Replacement.deleteFromTo(node.body.expression.end, node.end),
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]);
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}
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else {
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return ts.forEachChild(node, cb);
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}
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}
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}
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function isRedundantCallback(parameters, args, expression) {
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if (parameters.length !== args.length) {
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return false;
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}
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for (var i = 0; i < parameters.length; ++i) {
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var _a = parameters[i], dotDotDotToken = _a.dotDotDotToken, name = _a.name;
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var arg = args[i];
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if (dotDotDotToken !== undefined) {
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if (!tsutils_1.isSpreadElement(arg)) {
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return false;
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}
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arg = arg.expression;
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}
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if (!tsutils_1.isIdentifier(name) || !tsutils_1.isIdentifier(arg) || name.text !== arg.text
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|| expression.text === name.text) {
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return false;
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}
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}
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return true;
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}
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var _a;
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