BufReader implements buffering for a Reader object.

BufWriter implements buffering for an deno.Writer object. If an error occurs writing to a Writer, no more data will be accepted and all subsequent writes, and flush(), will return the error. After all data has been written, the client should call the flush() method to guarantee all data has been forwarded to the underlying deno.Writer.

Decodes a given RFC4648 base64 encoded string

CREDIT: https://gist.github.com/enepomnyaschih/72c423f727d395eeaa09697058238727 Encodes a given Uint8Array, ArrayBuffer or string into RFC4648 base64 representation