Can Transform stream in node js read strings, but write in object mode?

Question

I am trying to make transform stream to write in object mode, but keep reading strings. Is it possible? Documentation says, that for Duplex stream I can set readableObjectMode and writableObjectMode separately, but somehow it is not working for me. When I use callback with my object in _flush, I get error: Invalid non-string/buffer chunk

Am I doing something wrong or it doesn't work in Transform streams?

Here is my code:

class stream extends Transform {
  private logs: { name: string, errors: any[] };

  constructor() {
    super({ writableObjectMode: true });
    this.logs = { name: this.tableName, errors: [] };
  }

  _transform(chunk, encoding, callback) {
    // stuff here
    callback();
  }

  _flush(callback) {
    //here I get error
    callback(undefined, this.logs);
  }
}

klnkt · Accepted Answer · 2019-01-28 11:30:03Z

6

I found the answer. I need to set { readableObjectMode: true } instead, because this is actually a readable side of my transform stream that I am using, not writable.

answered Jan 28, 2019 at 11:30

klnkt

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