Add components

slider/node_modules/eslint/lib/rules/utils/regular-expressions.js

@@ -0,0 +1,58 @@
+/**
+ * @fileoverview Common utils for regular expressions.
+ * @author Josh Goldberg
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+const { RegExpValidator } = require("@eslint-community/regexpp");
+
+const REGEXPP_LATEST_ECMA_VERSION = 2025;
+
+/**
+ * Checks if the given regular expression pattern would be valid with the `u` flag.
+ * @param {number} ecmaVersion ECMAScript version to parse in.
+ * @param {string} pattern The regular expression pattern to verify.
+ * @param {"u"|"v"} flag The type of Unicode flag
+ * @returns {boolean} `true` if the pattern would be valid with the `u` flag.
+ * `false` if the pattern would be invalid with the `u` flag or the configured
+ * ecmaVersion doesn't support the `u` flag.
+ */
+function isValidWithUnicodeFlag(ecmaVersion, pattern, flag = "u") {
+	if (flag === "u" && ecmaVersion <= 5) {
+		// ecmaVersion <= 5 doesn't support the 'u' flag
+		return false;
+	}
+	if (flag === "v" && ecmaVersion <= 2023) {
+		return false;
+	}
+
+	const validator = new RegExpValidator({
+		ecmaVersion: Math.min(ecmaVersion, REGEXPP_LATEST_ECMA_VERSION),
+	});
+
+	try {
+		validator.validatePattern(
+			pattern,
+			void 0,
+			void 0,
+			flag === "u"
+				? {
+						unicode: /* uFlag = */ true,
+					}
+				: {
+						unicodeSets: true,
+					},
+		);
+	} catch {
+		return false;
+	}
+
+	return true;
+}
+
+module.exports = {
+	isValidWithUnicodeFlag,
+	REGEXPP_LATEST_ECMA_VERSION,
+};