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/** * @fileoverview Rule to disallow if as the only statement in an else block * @author Brandon Mills */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow `if` statements as the only statement in `else` blocks", recommended: false, url: "https://eslint.org/docs/latest/rules/no-lonely-if" }, schema: [], fixable: "code", messages: { unexpectedLonelyIf: "Unexpected if as the only statement in an else block." } }, create(context) { const sourceCode = context.sourceCode; return { IfStatement(node) { const parent = node.parent, grandparent = parent.parent; if (parent && parent.type === "BlockStatement" && parent.body.length === 1 && grandparent && grandparent.type === "IfStatement" && parent === grandparent.alternate) { context.report({ node, messageId: "unexpectedLonelyIf", fix(fixer) { const openingElseCurly = sourceCode.getFirstToken(parent); const closingElseCurly = sourceCode.getLastToken(parent); const elseKeyword = sourceCode.getTokenBefore(openingElseCurly); const tokenAfterElseBlock = sourceCode.getTokenAfter(closingElseCurly); const lastIfToken = sourceCode.getLastToken(node.consequent); const sourceText = sourceCode.getText(); if (sourceText.slice(openingElseCurly.range[1], node.range[0]).trim() || sourceText.slice(node.range[1], closingElseCurly.range[0]).trim()) { // Don't fix if there are any non-whitespace characters interfering (e.g. comments) return null; } if ( node.consequent.type !== "BlockStatement" && lastIfToken.value !== ";" && tokenAfterElseBlock && ( node.consequent.loc.end.line === tokenAfterElseBlock.loc.start.line || /^[([/+`-]/u.test(tokenAfterElseBlock.value) || lastIfToken.value === "++" || lastIfToken.value === "--" ) ) { /* * If the `if` statement has no block, and is not followed by a semicolon, make sure that fixing * the issue would not change semantics due to ASI. If this would happen, don't do a fix. */ return null; } return fixer.replaceTextRange( [openingElseCurly.range[0], closingElseCurly.range[1]], (elseKeyword.range[1] === openingElseCurly.range[0] ? " " : "") + sourceCode.getText(node) ); } }); } } }; } };