88 lines
3.5 KiB
JavaScript
88 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 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 utils = 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 (name) {
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return "Duplicate variable: '" + name + "'";
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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-duplicate-variable",
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description: "Disallows duplicate variable declarations in the same block scope.",
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descriptionDetails: (_a = ["\n This rule is only useful when using the `var` keyword -\n the compiler will detect redeclarations of `let` and `const` variables."], _a.raw = ["\n This rule is only useful when using the \\`var\\` keyword -\n the compiler will detect redeclarations of \\`let\\` and \\`const\\` variables."], Lint.Utils.dedent(_a)),
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rationale: (_b = ["\n A variable can be reassigned if necessary -\n there's no good reason to have a duplicate variable declaration."], _b.raw = ["\n A variable can be reassigned if necessary -\n there's no good reason to have a duplicate variable declaration."], Lint.Utils.dedent(_b)),
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optionsDescription: "Not configurable.",
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options: null,
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optionExamples: [true],
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type: "functionality",
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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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var scope = new Set();
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return ts.forEachChild(ctx.sourceFile, function cb(node) {
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if (utils.isFunctionScopeBoundary(node)) {
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var oldScope = scope;
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scope = new Set();
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ts.forEachChild(node, cb);
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scope = oldScope;
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return;
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}
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else if (utils.isVariableDeclaration(node) && !utils.isBlockScopedVariableDeclaration(node)) {
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forEachBoundIdentifier(node.name, function (id) {
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var text = id.text;
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if (scope.has(text)) {
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ctx.addFailureAtNode(id, Rule.FAILURE_STRING(text));
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}
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else {
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scope.add(text);
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}
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});
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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 forEachBoundIdentifier(name, action) {
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if (name.kind === ts.SyntaxKind.Identifier) {
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action(name);
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}
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else {
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for (var _i = 0, _a = name.elements; _i < _a.length; _i++) {
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var e = _a[_i];
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if (e.kind !== ts.SyntaxKind.OmittedExpression) {
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forEachBoundIdentifier(e.name, action);
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}
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}
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}
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}
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var _a, _b;
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