diff options
Diffstat (limited to 'node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js')
-rw-r--r-- | node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js b/node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js new file mode 100644 index 000000000..b147fe076 --- /dev/null +++ b/node_modules/tslint/lib/rules/noUnnecessaryInitializerRule.js @@ -0,0 +1,105 @@ +"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 Rule = (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); + }; + return Rule; +}(Lint.Rules.AbstractRule)); +/* tslint:disable:object-literal-sort-keys */ +Rule.metadata = { + ruleName: "no-unnecessary-initializer", + description: "Forbids a 'var'/'let' statement or destructuring initializer to be initialized to 'undefined'.", + hasFix: true, + optionsDescription: "Not configurable.", + options: null, + optionExamples: [true], + type: "style", + typescriptOnly: false, +}; +/* tslint:enable:object-literal-sort-keys */ +Rule.FAILURE_STRING = "Unnecessary initialization to 'undefined'."; +Rule.FAILURE_STRING_PARAMETER = "Use an optional parameter instead of initializing to 'undefined'. " + + "Also, the type declaration does not need to include '| undefined'."; +exports.Rule = Rule; +function walk(ctx) { + ts.forEachChild(ctx.sourceFile, function cb(node) { + switch (node.kind) { + case ts.SyntaxKind.BindingElement: + checkInitializer(node); + break; + case ts.SyntaxKind.VariableDeclaration: + if (!tsutils_1.isBindingPattern(node.name) && !Lint.isNodeFlagSet(node.parent, ts.NodeFlags.Const)) { + checkInitializer(node); + } + break; + case ts.SyntaxKind.MethodDeclaration: + case ts.SyntaxKind.FunctionDeclaration: + case ts.SyntaxKind.Constructor: { + var parameters_1 = node.parameters; + parameters_1.forEach(function (parameter, i) { + if (isUndefined(parameter.initializer)) { + if (parametersAllOptionalAfter(parameters_1, i)) { + // No fix since they may want to remove '| undefined' from the type. + ctx.addFailureAtNode(parameter, Rule.FAILURE_STRING_PARAMETER); + } + else { + failWithFix(parameter); + } + } + }); + break; + } + } + ts.forEachChild(node, cb); + }); + function checkInitializer(node) { + if (isUndefined(node.initializer)) { + failWithFix(node); + } + } + function failWithFix(node) { + var fix = Lint.Replacement.deleteFromTo(Lint.childOfKind(node, ts.SyntaxKind.EqualsToken).pos, node.end); + ctx.addFailureAtNode(node, Rule.FAILURE_STRING, fix); + } +} +function parametersAllOptionalAfter(parameters, idx) { + for (var i = idx + 1; i < parameters.length; i++) { + if (parameters[i].questionToken !== undefined) { + return true; + } + if (parameters[i].initializer === undefined) { + return false; + } + } + return true; +} +function isUndefined(node) { + return node !== undefined && + node.kind === ts.SyntaxKind.Identifier && + node.originalKeywordKind === ts.SyntaxKind.UndefinedKeyword; +} |