Index: frontend/node_modules/es-to-primitive/es2015.js
===================================================================
--- frontend/node_modules/es-to-primitive/es2015.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/es-to-primitive/es2015.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,82 @@
+'use strict';
+
+var hasSymbols = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol';
+
+var isPrimitive = require('./helpers/isPrimitive');
+var isCallable = require('is-callable');
+var isDate = require('is-date-object');
+var isSymbol = require('is-symbol');
+
+/** @type {(O: { valueOf?: () => unknown, toString?: () => unknown }, hint: 'number' | 'string' | 'default') => null | undefined | string | symbol | number | boolean | bigint} */
+var ordinaryToPrimitive = function OrdinaryToPrimitive(O, hint) {
+	if (typeof O === 'undefined' || O === null) {
+		throw new TypeError('Cannot call method on ' + O);
+	}
+	if (typeof hint !== 'string' || (hint !== 'number' && hint !== 'string')) {
+		throw new TypeError('hint must be "string" or "number"');
+	}
+	/** @type {('toString' | 'valueOf')[]} */
+	var methodNames = hint === 'string' ? ['toString', 'valueOf'] : ['valueOf', 'toString'];
+	var method, result, i;
+	for (i = 0; i < methodNames.length; ++i) {
+		method = O[methodNames[i]];
+		if (isCallable(method)) {
+			result = method.call(O);
+			if (isPrimitive(result)) {
+				return result;
+			}
+		}
+	}
+	throw new TypeError('No default value');
+};
+
+/** @type {<K extends PropertyKey>(O: Record<K, unknown>, P: K) => Function | undefined} */
+var GetMethod = function GetMethod(O, P) {
+	var func = O[P];
+	if (func !== null && typeof func !== 'undefined') {
+		if (!isCallable(func)) {
+			throw new TypeError(func + ' returned for property ' + String(P) + ' of object ' + O + ' is not a function');
+		}
+		return func;
+	}
+	return void 0;
+};
+
+/** @type {import('./es2015')} */
+// http://www.ecma-international.org/ecma-262/6.0/#sec-toprimitive
+module.exports = function ToPrimitive(input) {
+	if (isPrimitive(input)) {
+		return input;
+	}
+	/** @type {'default' | 'string' | 'number'} */
+	var hint = 'default';
+	if (arguments.length > 1) {
+		if (arguments[1] === String) {
+			hint = 'string';
+		} else if (arguments[1] === Number) {
+			hint = 'number';
+		}
+	}
+
+	var exoticToPrim;
+	if (hasSymbols) {
+		if (Symbol.toPrimitive) {
+			// eslint-disable-next-line no-extra-parens
+			exoticToPrim = GetMethod(/** @type {Record<PropertyKey, unknown>} */ (input), Symbol.toPrimitive);
+		} else if (isSymbol(input)) {
+			exoticToPrim = Symbol.prototype.valueOf;
+		}
+	}
+	if (typeof exoticToPrim !== 'undefined') {
+		var result = exoticToPrim.call(input, hint);
+		if (isPrimitive(result)) {
+			return result;
+		}
+		throw new TypeError('unable to convert exotic object to primitive');
+	}
+	if (hint === 'default' && (isDate(input) || isSymbol(input))) {
+		hint = 'string';
+	}
+	// eslint-disable-next-line no-extra-parens
+	return ordinaryToPrimitive(/** @type {object} */ (input), hint === 'default' ? 'number' : hint);
+};