One problem with async blob creation I ran into is dynamically created
blobs of unknown type:
navigator.clipboard.write([
new ClipboardItem({
'foo/bar': new Promise(async (resolve) => {
// Obtain blob data somehow, the type `foo/bar` will be dynamic.
resolve(new Blob([data], { type: 'foo/bar' }));
}),
}),
]);
You need to know `foo/bar` for passing it to `ClipboardItem`, but it may
only be available after the data has been created. Since Safari and Chrome
expire user gestures differently (see
https://bugs.webkit.org/show_bug.cgi?id=222262#c5), this renders some copy
use cases currently impossible.
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