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52 lines
1.7 KiB
52 lines
1.7 KiB
export var hasFetch = isFunction(global.fetch) && isFunction(global.ReadableStream)
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var _blobConstructor;
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export function blobConstructor() {
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if (typeof _blobConstructor !== 'undefined') {
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return _blobConstructor;
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}
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try {
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new global.Blob([new ArrayBuffer(1)])
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_blobConstructor = true
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} catch (e) {
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_blobConstructor = false
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}
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return _blobConstructor
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}
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var xhr;
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function checkTypeSupport(type) {
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if (!xhr) {
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xhr = new global.XMLHttpRequest()
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// If location.host is empty, e.g. if this page/worker was loaded
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// from a Blob, then use example.com to avoid an error
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xhr.open('GET', global.location.host ? '/' : 'https://example.com')
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}
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try {
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xhr.responseType = type
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return xhr.responseType === type
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} catch (e) {
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return false
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}
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}
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// For some strange reason, Safari 7.0 reports typeof global.ArrayBuffer === 'object'.
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// Safari 7.1 appears to have fixed this bug.
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var haveArrayBuffer = typeof global.ArrayBuffer !== 'undefined'
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var haveSlice = haveArrayBuffer && isFunction(global.ArrayBuffer.prototype.slice)
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export var arraybuffer = haveArrayBuffer && checkTypeSupport('arraybuffer')
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// These next two tests unavoidably show warnings in Chrome. Since fetch will always
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// be used if it's available, just return false for these to avoid the warnings.
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export var msstream = !hasFetch && haveSlice && checkTypeSupport('ms-stream')
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export var mozchunkedarraybuffer = !hasFetch && haveArrayBuffer &&
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checkTypeSupport('moz-chunked-arraybuffer')
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export var overrideMimeType = isFunction(xhr.overrideMimeType)
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export var vbArray = isFunction(global.VBArray)
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function isFunction(value) {
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return typeof value === 'function'
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}
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xhr = null // Help gc
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