eslint-plugin-sonarjs
Version:
SonarJS rules for ESLint
72 lines (71 loc) • 2.67 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/S1940
Object.defineProperty(exports, "__esModule", { value: true });
exports.rule = void 0;
const index_js_1 = require("../helpers/index.js");
const meta_js_1 = require("./meta.js");
const invertedOperators = {
'==': '!=',
'!=': '==',
'===': '!==',
'!==': '===',
'>': '<=',
'<': '>=',
'>=': '<',
'<=': '>',
};
exports.rule = {
meta: (0, index_js_1.generateMeta)(meta_js_1.meta, {
messages: {
useOppositeOperator: 'Use the opposite operator ({{invertedOperator}}) instead.',
suggestOperationInversion: 'Invert inner operation (apply if NaN is not expected)',
},
hasSuggestions: true,
fixable: 'code',
}),
create(context) {
return {
UnaryExpression: (node) => visitUnaryExpression(node, context),
};
},
};
function visitUnaryExpression(unaryExpression, context) {
if (unaryExpression.operator === '!' && unaryExpression.argument.type === 'BinaryExpression') {
const condition = unaryExpression.argument;
const invertedOperator = invertedOperators[condition.operator];
if (invertedOperator) {
const left = context.sourceCode.getText(condition.left);
const right = context.sourceCode.getText(condition.right);
const [start, end] = unaryExpression.parent?.type === 'UnaryExpression'
? ['(', ')']
: ['', ''];
context.report({
messageId: 'useOppositeOperator',
suggest: [
{
messageId: 'suggestOperationInversion',
fix: fixer => fixer.replaceText(unaryExpression, `${start}${left} ${invertedOperator} ${right}${end}`),
},
],
data: { invertedOperator },
node: unaryExpression,
});
}
}
}