var $ = require('../internals/export');
|
var uncurryThis = require('../internals/function-uncurry-this');
|
var $isCallable = require('../internals/is-callable');
|
var inspectSource = require('../internals/inspect-source');
|
var hasOwn = require('../internals/has-own-property');
|
var DESCRIPTORS = require('../internals/descriptors');
|
|
// eslint-disable-next-line es-x/no-object-getownpropertydescriptor -- safe
|
var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
|
var classRegExp = /^\s*class\b/;
|
var exec = uncurryThis(classRegExp.exec);
|
|
var isClassConstructor = function (argument) {
|
try {
|
// `Function#toString` throws on some built-it function in some legacy engines
|
// (for example, `DOMQuad` and similar in FF41-)
|
if (!DESCRIPTORS || !exec(classRegExp, inspectSource(argument))) return false;
|
} catch (error) { /* empty */ }
|
var prototype = getOwnPropertyDescriptor(argument, 'prototype');
|
return !!prototype && hasOwn(prototype, 'writable') && !prototype.writable;
|
};
|
|
// `Function.isCallable` method
|
// https://github.com/caitp/TC39-Proposals/blob/trunk/tc39-reflect-isconstructor-iscallable.md
|
$({ target: 'Function', stat: true, sham: true, forced: true }, {
|
isCallable: function isCallable(argument) {
|
return $isCallable(argument) && !isClassConstructor(argument);
|
}
|
});
|
