ChannelCallback typedef Null safety

void ChannelCallback(
  1. ByteData? data,
  2. PlatformMessageResponseCallback callback

Signature for ChannelBuffers.setListener's callback argument.

The first argument is the data sent by the plugin.

The second argument is a closure that, when called, will send messages back to the plugin.

See also:


typedef ChannelCallback = void Function(ByteData? data, PlatformMessageResponseCallback callback);