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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | 33x 20x 2x 18x 18x 33x 1x 1x | /**
* Compatibility functions for working with File API objects
*
* https://developer.mozilla.org/en-US/docs/Web/API/File
*/
export function isFile(file: unknown): file is File {
// browser
if (typeof File === 'function' && file instanceof File) {
return true
}
// node.js
const f = file as File
return (
typeof f === 'object' &&
typeof (f as File).name === 'string' &&
(typeof (f as File).stream === 'function' || typeof (f as File).arrayBuffer === 'function')
)
}
/**
* Compatibility helper for browsers where the `arrayBuffer function is
* missing from `File` objects.
*
* @param file A File object
*/
export async function fileArrayBuffer(file: File): Promise<ArrayBuffer> {
if (file.arrayBuffer) {
return file.arrayBuffer()
}
// workaround for Safari where arrayBuffer is not supported on Files
return new Promise(resolve => {
const fr = new FileReader()
fr.onload = () => resolve(fr.result as ArrayBuffer)
fr.readAsArrayBuffer(file)
})
}
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