Initial commit

themes/keepit/node_modules/stream-http/lib/capability.js

@@ -0,0 +1,59 @@
+exports.fetch = isFunction(global.fetch) && isFunction(global.ReadableStream)
+
+exports.writableStream = isFunction(global.WritableStream)
+
+exports.abortController = isFunction(global.AbortController)
+
+// The xhr request to example.com may violate some restrictive CSP configurations,
+// so if we're running in a browser that supports `fetch`, avoid calling getXHR()
+// and assume support for certain features below.
+var xhr
+function getXHR () {
+	// Cache the xhr value
+	if (xhr !== undefined) return xhr
+
+	if (global.XMLHttpRequest) {
+		xhr = new global.XMLHttpRequest()
+		// If XDomainRequest is available (ie only, where xhr might not work
+		// cross domain), use the page location. Otherwise use example.com
+		// Note: this doesn't actually make an http request.
+		try {
+			xhr.open('GET', global.XDomainRequest ? '/' : 'https://example.com')
+		} catch(e) {
+			xhr = null
+		}
+	} else {
+		// Service workers don't have XHR
+		xhr = null
+	}
+	return xhr
+}
+
+function checkTypeSupport (type) {
+	var xhr = getXHR()
+	if (!xhr) return false
+	try {
+		xhr.responseType = type
+		return xhr.responseType === type
+	} catch (e) {}
+	return false
+}
+
+// If fetch is supported, then arraybuffer will be supported too. Skip calling
+// checkTypeSupport(), since that calls getXHR().
+exports.arraybuffer = exports.fetch || checkTypeSupport('arraybuffer')
+
+// These next two tests unavoidably show warnings in Chrome. Since fetch will always
+// be used if it's available, just return false for these to avoid the warnings.
+exports.msstream = !exports.fetch && checkTypeSupport('ms-stream')
+exports.mozchunkedarraybuffer = !exports.fetch && checkTypeSupport('moz-chunked-arraybuffer')
+
+// If fetch is supported, then overrideMimeType will be supported too. Skip calling
+// getXHR().
+exports.overrideMimeType = exports.fetch || (getXHR() ? isFunction(getXHR().overrideMimeType) : false)
+
+function isFunction (value) {
+	return typeof value === 'function'
+}
+
+xhr = null // Help gc