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/** * @fileoverview Rule to flag when using constructor without parentheses * @author Ilya Volodin * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { deprecated: true, replacedBy: [], type: "layout", docs: { description: "Enforce or disallow parentheses when invoking a constructor with no arguments", recommended: false, url: "https://eslint.org/docs/latest/rules/new-parens" }, fixable: "code", schema: [ { enum: ["always", "never"] } ], messages: { missing: "Missing '()' invoking a constructor.", unnecessary: "Unnecessary '()' invoking a constructor with no arguments." } }, create(context) { const options = context.options; const always = options[0] !== "never"; // Default is always const sourceCode = context.sourceCode; return { NewExpression(node) { if (node.arguments.length !== 0) { return; // if there are arguments, there have to be parens } const lastToken = sourceCode.getLastToken(node); const hasLastParen = lastToken && astUtils.isClosingParenToken(lastToken); // `hasParens` is true only if the new expression ends with its own parens, e.g., new new foo() does not end with its own parens const hasParens = hasLastParen && astUtils.isOpeningParenToken(sourceCode.getTokenBefore(lastToken)) && node.callee.range[1] < node.range[1]; if (always) { if (!hasParens) { context.report({ node, messageId: "missing", fix: fixer => fixer.insertTextAfter(node, "()") }); } } else { if (hasParens) { context.report({ node, messageId: "unnecessary", fix: fixer => [ fixer.remove(sourceCode.getTokenBefore(lastToken)), fixer.remove(lastToken), fixer.insertTextBefore(node, "("), fixer.insertTextAfter(node, ")") ] }); } } } }; } };