Closed
Description
- 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.