- Version: v11.8.0
- Platform: Ubuntu 18.10
- Subsystem: stream
A Transform stream that transforms the entire input in one shot will generate just one readable event, when it should be two (one for data and one for EOS).
const stream = require('stream')
const fs = require('fs');
const r = new stream.Readable();
r._read = function(n) { this.push('content'); this.push(null); };
// const r = fs.createReadStream('/boot/memtest86+.bin');
var t = new stream.Transform({
transform: function(chunk, encoding, callback) {
console.log('_transform');
this.push(chunk);
return void callback();
},
flush: function(callback) {
console.log('_flush');
return void callback();
}
});
r.pipe(t);
t.on("readable", function() {
console.log("on readable");
while (true) {
var chunk = t.read();
console.log("chunk", chunk);
if (!chunk)
break;
}
});The output of this example is:
_transform
_flush
on readable
chunk <Buffer 63 6f 6e 74 65 6e 74>
chunk null
But it should be
_transform
_flush
on readable
chunk <Buffer 63 6f 6e 74 65 6e 74>
chunk null
on readable
chunk null
Using a larger input stream (like the commented out line) correctly produces the last readable event.
A Transform stream that transforms the entire input in one shot will generate just one
readableevent, when it should be two (one for data and one for EOS).The output of this example is:
But it should be
Using a larger input stream (like the commented out line) correctly produces the last
readableevent.