shell bypass 403
var uncurryThis = require('../internals/function-uncurry-this');
var fails = require('../internals/fails');
var isCallable = require('../internals/is-callable');
var classof = require('../internals/classof');
var getBuiltIn = require('../internals/get-built-in');
var inspectSource = require('../internals/inspect-source');
var noop = function () { /* empty */ };
var empty = [];
var construct = getBuiltIn('Reflect', 'construct');
var constructorRegExp = /^\s*(?:class|function)\b/;
var exec = uncurryThis(constructorRegExp.exec);
var INCORRECT_TO_STRING = !constructorRegExp.exec(noop);
var isConstructorModern = function isConstructor(argument) {
if (!isCallable(argument)) return false;
try {
construct(noop, empty, argument);
return true;
} catch (error) {
return false;
}
};
var isConstructorLegacy = function isConstructor(argument) {
if (!isCallable(argument)) return false;
switch (classof(argument)) {
case 'AsyncFunction':
case 'GeneratorFunction':
case 'AsyncGeneratorFunction': return false;
}
try {
// we can't check .prototype since constructors produced by .bind haven't it
// `Function#toString` throws on some built-it function in some legacy engines
// (for example, `DOMQuad` and similar in FF41-)
return INCORRECT_TO_STRING || !!exec(constructorRegExp, inspectSource(argument));
} catch (error) {
return true;
}
};
isConstructorLegacy.sham = true;
// `IsConstructor` abstract operation
// https://tc39.es/ecma262/#sec-isconstructor
module.exports = !construct || fails(function () {
var called;
return isConstructorModern(isConstructorModern.call)
|| !isConstructorModern(Object)
|| !isConstructorModern(function () { called = true; })
|| called;
}) ? isConstructorLegacy : isConstructorModern;