NodeJS v10: An example of Async-Iterator with Stream API

async-iterator-example.js

const fs = require("fs");

const inputFilePath = process.argv[2];
console.log("file:", inputFilePath);

async function main(inputFilePath) {
  const readStream = fs.createReadStream(inputFilePath, { encoding: 'utf8', highWaterMark: 1024 });

  // NOTE: Async-Iterator starts with NodeJS v10, but it's experimental yet. (Current latest LTS version: v10.13.0)
  for await (const chunk of readStream) {
    console.log('>>> '+chunk);
  }
  console.log('### DONE!');
}

main(inputFilePath).catch(console.error);

/* log:
 
$ node async-iterator-example.js "./hoge.csv" 
file: ./hoge.csv
(node:15500) ExperimentalWarning: Readable[Symbol.asyncIterator] is an experimental feature. This feature could change at any time
>>> aaaa,bbbb,ccc
1111,222,33333333
xxxx,yyyy,zzzzzzzzzzzzzzzz

### DONE!
*/