mixed.output_stream.js

import assert from 'node:assert';
import { parse } from 'csv-parse';

const records = [];
parse(`
  "1","2","3"
  "a","b","c"
`, {
  trim: true,
  skip_empty_lines: true
})
// Use the readable stream api
  .on('readable', function(){
    let record; while ((record = this.read()) !== null) {
      records.push(record);
    }
  })
// When we are done, test that the parsed records matched what expected
  .on('end', function(){
    assert.deepStrictEqual(
      records,
      [
        [ '1','2','3' ],
        [ 'a','b','c' ]
      ]
    );
  });