75 lines
2.3 KiB
JavaScript
75 lines
2.3 KiB
JavaScript
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'use strict';
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var fnToStr = Function.prototype.toString;
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var reflectApply = typeof Reflect === 'object' && Reflect !== null && Reflect.apply;
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var badArrayLike;
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var isCallableMarker;
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if (typeof reflectApply === 'function' && typeof Object.defineProperty === 'function') {
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try {
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badArrayLike = Object.defineProperty({}, 'length', {
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get: function () {
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throw isCallableMarker;
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}
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});
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isCallableMarker = {};
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// eslint-disable-next-line no-throw-literal
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reflectApply(function () { throw 42; }, null, badArrayLike);
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} catch (_) {
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if (_ !== isCallableMarker) {
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reflectApply = null;
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}
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}
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} else {
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reflectApply = null;
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}
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var constructorRegex = /^\s*class\b/;
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var isES6ClassFn = function isES6ClassFunction(value) {
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try {
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var fnStr = fnToStr.call(value);
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return constructorRegex.test(fnStr);
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} catch (e) {
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return false; // not a function
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}
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};
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var tryFunctionObject = function tryFunctionToStr(value) {
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try {
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if (isES6ClassFn(value)) { return false; }
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fnToStr.call(value);
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return true;
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} catch (e) {
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return false;
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}
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};
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var toStr = Object.prototype.toString;
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var fnClass = '[object Function]';
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var genClass = '[object GeneratorFunction]';
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var hasToStringTag = typeof Symbol === 'function' && !!Symbol.toStringTag; // better: use `has-tostringtag`
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/* globals document: false */
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var documentDotAll = typeof document === 'object' && typeof document.all === 'undefined' && document.all !== undefined ? document.all : {};
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module.exports = reflectApply
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? function isCallable(value) {
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if (value === documentDotAll) { return true; }
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if (!value) { return false; }
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if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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if (typeof value === 'function' && !value.prototype) { return true; }
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try {
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reflectApply(value, null, badArrayLike);
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} catch (e) {
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if (e !== isCallableMarker) { return false; }
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}
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return !isES6ClassFn(value);
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}
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: function isCallable(value) {
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if (value === documentDotAll) { return true; }
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if (!value) { return false; }
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if (typeof value !== 'function' && typeof value !== 'object') { return false; }
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if (typeof value === 'function' && !value.prototype) { return true; }
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if (hasToStringTag) { return tryFunctionObject(value); }
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if (isES6ClassFn(value)) { return false; }
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var strClass = toStr.call(value);
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return strClass === fnClass || strClass === genClass;
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};
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