Custom Readable Stream

[coodin]

• v14.17.0:
• Windows:
• Scope (install, code, runtime, meta, other?):
• Module (and version) (if relevant):

const { Readable } = require('stream');
const fs = require('fs');


class ReadStream extends Readable {
  constructor(filename) {
    super();
    this.filename = filename;
    this.fd = null;
  }
  _construct(callback) {
    fs.open(this.filename, (err, fd) => {
      if (err) {
        callback(err);
      } else {
        this.fd = fd;
        consolelog("fd:", this.fd);
        callback();
      }
    });
  }
  _read(n) {
    const buf = Buffer.alloc(n);
    fs.read(this.fd, buf, 0, n, null, (err, bytesRead) => {
      if (err) {
        this.destroy(err);
      } else {
        this.push(bytesRead > 0 ? buf.slice(0, bytesRead) : null);
      }
    });
  }
  _destroy(err, callback) {
    if (this.fd) {
      fs.close(this.fd, (er) => callback(er || err));
    } else {
      callback(err);
    }
  }
}

const example = new ReadStream("./lol.txt");
example.on("data", (chunk) => {
  console.log(chunk);
})

The error I have is that TypeError [ERR_INVALID_ARG_TYPE]: The "fd" argument must be of type number. Received null from fs.read() inside _read method because it has not been encountered _construct method before _read method which it should have encountered depend on documentation. I am not sure I am right but thank you for contribution already.
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[Ayase-252]

_construct (nodejs/node#29656) was added in Node.js v15.0. You need use v15.0 and above (ideally, v16).

[coodin]

Yea I think , it was the problem because it is worked when I upgradated latest version of nodejs.