It would be useful to be able to access the line json on each line emit

[oliverfoster]

json2csv/packages/plainjs/src/StreamParser.ts

Lines 195 to 201 in 8c7895c

	processedData.forEach((row) => {
	const line = this.processRow(row);
	if (line === undefined) return;
	this.onLine(line);
	this.onData(this._hasWritten ? this.opts.eol + line : line);
	this._hasWritten = true;
	});

    processedData.forEach((row) => {
      const line = this.processRow(row);
      if (line === undefined) return;
      this.onLine(line, row); // <- add row here
      this.onData(this._hasWritten ? this.opts.eol + line : line);
      this._hasWritten = true;
    });

json2csv/packages/node/src/Transform.ts

Line 38 in 8c7895c

this.streamParser.onLine = (line) => this.emit('line', line);

this.streamParser.onLine = (line, row) => this.emit('line', line, row); 

[juanjoDiaz]

Hi @oliverfoster ,

Can you elaborate on why do you think that the unprocessed data is needed?
It sounds like you are trying to troubleshoot something?

[oliverfoster]

I think I was trying to do two things independently, measure and display the conversion progress and also then separately to create indexes for the CSV to speed up subsequent processing. Both things are helped by being able to identify the source JSON of the given output line (its date, id, index etc).

I think I may have also used it for filtering subsets whilst converting. Such that lines containing various properties would end up in segregated csvs.

As it would be an optional second argument, it shouldn't cost much to pass along the raw JSON object reference I would think, but it can be useful for a variety of use-cases.