43 lines
1 KiB
JavaScript
43 lines
1 KiB
JavaScript
'use strict';
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var IsCallable = require('es-abstract/2021/IsCallable');
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var functionsHaveNames = require('functions-have-names')();
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var callBound = require('call-bind/callBound');
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var $functionToString = callBound('Function.prototype.toString');
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var $stringMatch = callBound('String.prototype.match');
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var classRegex = /^class /;
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var isClass = function isClassConstructor(fn) {
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if (IsCallable(fn)) {
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return false;
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}
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if (typeof fn !== 'function') {
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return false;
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}
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try {
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var match = $stringMatch($functionToString(fn), classRegex);
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return !!match;
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} catch (e) {}
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return false;
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};
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var regex = /\s*function\s+([^(\s]*)\s*/;
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var functionProto = Function.prototype;
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module.exports = function getName() {
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if (!isClass(this) && !IsCallable(this)) {
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throw new TypeError('Function.prototype.name sham getter called on non-function');
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}
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if (functionsHaveNames) {
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return this.name;
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}
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if (this === functionProto) {
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return '';
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}
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var str = $functionToString(this);
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var match = $stringMatch(str, regex);
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var name = match && match[1];
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return name;
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};
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