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31 lines
1.1 KiB
31 lines
1.1 KiB
2 years ago
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/**
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* Gets the source (i.e. host) of the script currently running.
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* @returns {string}
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*/
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function getCurrentScriptSource() {
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// `document.currentScript` is the most accurate way to get the current running script,
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// but is not supported in all browsers (most notably, IE).
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if ('currentScript' in document) {
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// In some cases, `document.currentScript` would be `null` even if the browser supports it:
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// e.g. asynchronous chunks on Firefox.
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// We should not fallback to the list-approach as it would not be safe.
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if (document.currentScript == null) return;
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return document.currentScript.getAttribute('src');
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}
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// Fallback to getting all scripts running in the document,
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// and finding the last one injected.
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else {
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const scriptElementsWithSrc = Array.prototype.filter.call(
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document.scripts || [],
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function (elem) {
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return elem.getAttribute('src');
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}
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);
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if (!scriptElementsWithSrc.length) return;
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const currentScript = scriptElementsWithSrc[scriptElementsWithSrc.length - 1];
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return currentScript.getAttribute('src');
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}
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}
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module.exports = getCurrentScriptSource;
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