/**
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* Gets what should be in the `response` property of the XHR. However,
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* since we still support the final versions of IE, we need to do a little
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* checking here to make sure that we get the right thing back. Consequently,
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* we need to do a JSON.parse() in here, which *could* throw if the response
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* isn't valid JSON.
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*
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* This is used both in creating an AjaxResponse, and in creating certain errors
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* that we throw, so we can give the user whatever was in the response property.
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*
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* @param xhr The XHR to examine the response of
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*/
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export function getXHRResponse(xhr: XMLHttpRequest) {
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switch (xhr.responseType) {
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case 'json': {
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if ('response' in xhr) {
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return xhr.response;
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} else {
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// IE
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const ieXHR: any = xhr;
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return JSON.parse(ieXHR.responseText);
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}
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}
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case 'document':
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return xhr.responseXML;
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case 'text':
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default: {
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if ('response' in xhr) {
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return xhr.response;
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} else {
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// IE
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const ieXHR: any = xhr;
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return ieXHR.responseText;
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}
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}
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}
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}
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