Convert image uri to base64

I want to use code below to take snap shot and share.

ReactNative.takeSnapshot(this.refs.location, {format: ‘jpeg’, quality: 1}).then((uri) => {


I had try to use FileSystem.readAsStringAsync(fileUri, options) to convert into base64, but this only suitable for file.
So, I would like to ask how to convert uri into base64 String ?



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