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文件: /usr/share/nodejs/core-js/modules/esnext.function.is-callable.js
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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/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); } });
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