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rOACCT/node_modules/core-js/modules/es.regexp.flags.js
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es.regexp.flags.js
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			var global = require('../internals/global');
			var DESCRIPTORS = require('../internals/descriptors');
			var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
			var regExpFlags = require('../internals/regexp-flags');
			var fails = require('../internals/fails');

			// babel-minify and Closure Compiler transpiles RegExp('.', 'd') -> /./d and it causes SyntaxError
			var RegExp = global.RegExp;
			var RegExpPrototype = RegExp.prototype;

			var FORCED = DESCRIPTORS && fails(function () {
			var INDICES_SUPPORT = true;
			try {
			RegExp('.', 'd');
			} catch (error) {
			INDICES_SUPPORT = false;
			}

			var O = {};
			// modern V8 bug
			var calls = '';
			var expected = INDICES_SUPPORT ? 'dgimsy' : 'gimsy';

			var addGetter = function (key, chr) {
			// eslint-disable-next-line es/no-object-defineproperty -- safe
			Object.defineProperty(O, key, { get: function () {
			calls += chr;
			return true;
			} });
			};

			var pairs = {
			dotAll: 's',
			global: 'g',
			ignoreCase: 'i',
			multiline: 'm',
			sticky: 'y'
			};

			if (INDICES_SUPPORT) pairs.hasIndices = 'd';

			for (var key in pairs) addGetter(key, pairs[key]);

			// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
			var result = Object.getOwnPropertyDescriptor(RegExpPrototype, 'flags').get.call(O);

			return result !== expected \|\| calls !== expected;
			});

			// `RegExp.prototype.flags` getter
			// https://tc39.es/ecma262/#sec-get-regexp.prototype.flags
			if (FORCED) defineBuiltInAccessor(RegExpPrototype, 'flags', {
			configurable: true,
			get: regExpFlags
			});