save code

frontend/node_modules/is-symbol/.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*]
+indent_style = tab;
+insert_final_newline = true;
+quote_type = auto;
+space_after_anonymous_functions = true;
+space_after_control_statements = true;
+spaces_around_operators = true;
+trim_trailing_whitespace = true;
+spaces_in_brackets = false;
+end_of_line = lf;
+

frontend/node_modules/is-symbol/.eslintrc

@@ -0,0 +1,14 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"overrides": [
+		{
+			"files": "test/**",
+			"rules": {
+				"no-restricted-properties": 0,
+			},
+		},
+	],
+}

frontend/node_modules/is-symbol/.nycrc

@@ -0,0 +1,9 @@
+{
+	"all": true,
+	"check-coverage": false,
+	"reporter": ["text-summary", "text", "html", "json"],
+	"exclude": [
+		"coverage",
+		"test"
+	]
+}

frontend/node_modules/is-symbol/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Jordan Harband
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

frontend/node_modules/is-symbol/index.js

@@ -0,0 +1,40 @@
+'use strict';
+
+var callBound = require('call-bound');
+var $toString = callBound('Object.prototype.toString');
+var hasSymbols = require('has-symbols')();
+var safeRegexTest = require('safe-regex-test');
+
+if (hasSymbols) {
+	var $symToStr = callBound('Symbol.prototype.toString');
+	var isSymString = safeRegexTest(/^Symbol\(.*\)$/);
+
+	/** @type {(value: object) => value is Symbol} */
+	var isSymbolObject = function isRealSymbolObject(value) {
+		if (typeof value.valueOf() !== 'symbol') {
+			return false;
+		}
+		return isSymString($symToStr(value));
+	};
+
+	/** @type {import('.')} */
+	module.exports = function isSymbol(value) {
+		if (typeof value === 'symbol') {
+			return true;
+		}
+		if (!value || typeof value !== 'object' || $toString(value) !== '[object Symbol]') {
+			return false;
+		}
+		try {
+			return isSymbolObject(value);
+		} catch (e) {
+			return false;
+		}
+	};
+} else {
+	/** @type {import('.')} */
+	module.exports = function isSymbol(value) {
+		// this environment does not support Symbols.
+		return false && value;
+	};
+}