31 lines
774 B
JavaScript
31 lines
774 B
JavaScript
'use strict';
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var functionsHaveNames = function functionsHaveNames() {
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return typeof function f() {}.name === 'string';
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};
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var gOPD = Object.getOwnPropertyDescriptor;
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if (gOPD) {
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try {
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gOPD([], 'length');
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} catch (e) {
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// IE 8 has a broken gOPD
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gOPD = null;
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}
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}
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functionsHaveNames.functionsHaveConfigurableNames = function functionsHaveConfigurableNames() {
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if (!functionsHaveNames() || !gOPD) {
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return false;
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}
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var desc = gOPD(function () {}, 'name');
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return !!desc && !!desc.configurable;
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};
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var $bind = Function.prototype.bind;
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functionsHaveNames.boundFunctionsHaveNames = function boundFunctionsHaveNames() {
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return functionsHaveNames() && typeof $bind === 'function' && function f() {}.bind().name !== '';
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};
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module.exports = functionsHaveNames;
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