vue hello world项目
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'use strict';
// TODO: Remove from `core-js@4` since it's moved to entry points
require('../modules/es.regexp.exec');
var uncurryThis = require('../internals/function-uncurry-this');
var redefine = require('../internals/redefine');
var regexpExec = require('../internals/regexp-exec');
var fails = require('../internals/fails');
var wellKnownSymbol = require('../internals/well-known-symbol');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var SPECIES = wellKnownSymbol('species');
var RegExpPrototype = RegExp.prototype;
module.exports = function (KEY, exec, FORCED, SHAM) {
var SYMBOL = wellKnownSymbol(KEY);
var DELEGATES_TO_SYMBOL = !fails(function () {
// String methods call symbol-named RegEp methods
var O = {};
O[SYMBOL] = function () { return 7; };
return ''[KEY](O) != 7;
});
var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {
// Symbol-named RegExp methods call .exec
var execCalled = false;
var re = /a/;
if (KEY === 'split') {
// We can't use real regex here since it causes deoptimization
// and serious performance degradation in V8
// https://github.com/zloirock/core-js/issues/306
re = {};
// RegExp[@@split] doesn't call the regex's exec method, but first creates
// a new one. We need to return the patched regex when creating the new one.
re.constructor = {};
re.constructor[SPECIES] = function () { return re; };
re.flags = '';
re[SYMBOL] = /./[SYMBOL];
}
re.exec = function () { execCalled = true; return null; };
re[SYMBOL]('');
return !execCalled;
});
if (
!DELEGATES_TO_SYMBOL ||
!DELEGATES_TO_EXEC ||
FORCED
) {
var uncurriedNativeRegExpMethod = uncurryThis(/./[SYMBOL]);
var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
var uncurriedNativeMethod = uncurryThis(nativeMethod);
var $exec = regexp.exec;
if ($exec === regexpExec || $exec === RegExpPrototype.exec) {
if (DELEGATES_TO_SYMBOL && !forceStringMethod) {
// The native String method already delegates to @@method (this
// polyfilled function), leasing to infinite recursion.
// We avoid it by directly calling the native @@method method.
return { done: true, value: uncurriedNativeRegExpMethod(regexp, str, arg2) };
}
return { done: true, value: uncurriedNativeMethod(str, regexp, arg2) };
}
return { done: false };
});
redefine(String.prototype, KEY, methods[0]);
redefine(RegExpPrototype, SYMBOL, methods[1]);
}
if (SHAM) createNonEnumerableProperty(RegExpPrototype[SYMBOL], 'sham', true);
};