eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
75 lines (74 loc) • 3.27 kB
JavaScript
;
/*
* 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/S3757/javascript
Object.defineProperty(exports, "__esModule", { value: true });
exports.rule = void 0;
const typescript_1 = require("typescript");
const helpers_1 = require("../helpers");
const meta_1 = require("./meta");
const BINARY_OPERATORS = ['/', '*', '%', '-', '-=', '*=', '/=', '%='];
const UNARY_OPERATORS = ['++', '--', '+', '-'];
exports.rule = {
meta: (0, helpers_1.generateMeta)(meta_1.meta, {
messages: {
noEvaluatedNaN: 'Change the expression which uses this operand so that it can\'t evaluate to "NaN" (Not a Number).',
},
}),
create(context) {
const services = context.sourceCode.parserServices;
if (!(0, helpers_1.isRequiredParserServices)(services)) {
return {};
}
function isObjectType(...types) {
return types.some(t => !!(t.getFlags() & typescript_1.TypeFlags.Object) && !isDate(t) && t.symbol?.name !== 'Number');
}
function isDate(type) {
const { typeToString } = services.program.getTypeChecker();
return typeToString(type) === 'Date';
}
return {
'BinaryExpression, AssignmentExpression': (node) => {
const expression = node;
if (!BINARY_OPERATORS.includes(expression.operator)) {
return;
}
const leftType = (0, helpers_1.getTypeFromTreeNode)(expression.left, services);
const rightType = (0, helpers_1.getTypeFromTreeNode)(expression.right, services);
if (isObjectType(leftType)) {
context.report({ node: expression.left, messageId: 'noEvaluatedNaN' });
}
if (isObjectType(rightType)) {
context.report({ node: expression.right, messageId: 'noEvaluatedNaN' });
}
},
'UnaryExpression, UpdateExpression': (node) => {
const expr = node;
if (!UNARY_OPERATORS.includes(expr.operator)) {
return;
}
const argType = (0, helpers_1.getTypeFromTreeNode)(expr.argument, services);
if (isObjectType(argType)) {
context.report({ node, messageId: 'noEvaluatedNaN' });
}
},
};
},
};