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Filename : new-parens.js
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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('../types').Rule.RuleModule} */
module.exports = {
	meta: {
		deprecated: {
			message: "Formatting rules are being moved out of ESLint core.",
			url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/",
			deprecatedSince: "8.53.0",
			availableUntil: "11.0.0",
			replacedBy: [
				{
					message:
						"ESLint Stylistic now maintains deprecated stylistic core rules.",
					url: "https://eslint.style/guide/migration",
					plugin: {
						name: "@stylistic/eslint-plugin",
						url: "https://eslint.style",
					},
					rule: {
						name: "new-parens",
						url: "https://eslint.style/rules/new-parens",
					},
				},
			],
		},
		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, ")"),
							],
						});
					}
				}
			},
		};
	},
};