[Help Wanted] How to get file size of a file to be downloaded

[brystfire08]

Hi need help on getting the file size of a file from server before it is saved to the device storage. I need it to check if the device storage is at least twice enough for the file size to be saved.

Something like this:
var documentPath = dirs.DocumentDir;

RNFetchBlob.fs.stat(documentPath + '/sampleFile)
	.then((data) => {							
		RNFetchBlob.fs.df()
			.then((response) => {
				if(response.internal_free > parseInt(data.size)  * 2 ) {
					//do it
				}
				else {
					//warn
				}
		})
});

but fs.stat only works on files in device.. i think