An abstract interface which when implemented provides an interface to read bytes into an array buffer asynchronously.
Reads up to
p.byteLength bytes into
p. It resolves to the number of
bytes read (
p.byteLength) and rejects if any error
encountered. Even if
read() resolves to
p.byteLength, it may
use all of
p as scratch space during the call. If some data is
available but not
read() conventionally resolves
to what is available instead of waiting for more.
read() encounters end-of-file condition, it resolves to EOF
read() encounters an error, it rejects with an error.
Callers should always process the
0 bytes returned before
considering the EOF (
null). Doing so correctly handles I/O errors that
happen after reading some bytes and also both of the allowed EOF
Implementations should not retain a reference to
to turn a
Reader into an