A copy of the builtin FilePropertyBag type as it isn't fully supported in certain environments and attempting to reference the global version will error.
FilePropertyBag
https://github.com/microsoft/TypeScript/blob/49ad1a3917a0ea57f5ff248159256e12bb1cb705/src/lib/dom.generated.d.ts#L503 https://developer.mozilla.org/en-US/docs/Web/API/File/File#options
Optional
A copy of the builtin
FilePropertyBagtype as it isn't fully supported in certain environments and attempting to reference the global version will error.https://github.com/microsoft/TypeScript/blob/49ad1a3917a0ea57f5ff248159256e12bb1cb705/src/lib/dom.generated.d.ts#L503 https://developer.mozilla.org/en-US/docs/Web/API/File/File#options