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rule.ts
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rule.ts
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/*
* SonarQube JavaScript Plugin
* Copyright (C) 2011-2024 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
// https://sonarsource.github.io/rspec/#/rspec/S6959/javascript
import { Rule } from 'eslint';
import { isArray, isCallingMethod, isRequiredParserServices } from '../helpers';
export const rule: Rule.RuleModule = {
meta: {
messages: {
message: 'Add an initial value to this "reduce()" call.',
},
},
create(context: Rule.RuleContext) {
const services = context.parserServices;
if (!isRequiredParserServices(services)) {
return {};
}
return {
CallExpression(node) {
if (isCallingMethod(node, 1, 'reduce') && isArray(node.callee.object, services)) {
context.report({
node: node.callee.property,
messageId: 'message',
});
}
},
};
},
};