eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
75 lines (74 loc) • 3.29 kB
JavaScript
;
/*
* SonarQube JavaScript Plugin
* Copyright (C) 2011-2025 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 Sonar Source-Available License Version 1, as published by SonarSource SA.
*
* 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 Sonar Source-Available License for more details.
*
* You should have received a copy of the Sonar Source-Available License
* along with this program; if not, see https://sonarsource.com/license/ssal/
*/
// https://sonarsource.github.io/rspec/#/rspec/S3757/javascript
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.rule = void 0;
const typescript_1 = __importDefault(require("typescript"));
const index_js_1 = require("../helpers/index.js");
const meta_js_1 = require("./meta.js");
const BINARY_OPERATORS = ['/', '*', '%', '-', '-=', '*=', '/=', '%='];
const UNARY_OPERATORS = ['++', '--', '+', '-'];
exports.rule = {
meta: (0, index_js_1.generateMeta)(meta_js_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, index_js_1.isRequiredParserServices)(services)) {
return {};
}
function isObjectType(...types) {
return types.some(t => !!(t.getFlags() & typescript_1.default.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, index_js_1.getTypeFromTreeNode)(expression.left, services);
const rightType = (0, index_js_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, index_js_1.getTypeFromTreeNode)(expr.argument, services);
if (isObjectType(argType)) {
context.report({ node, messageId: 'noEvaluatedNaN' });
}
},
};
},
};