How can I pass `this` context to a self invoking anonymous function without storing `this` in a variable?

Ideally we can do this using the Function.prototype.bind function. I don't think there's a clear way to use a fat arrow function here either. Ycombinator magic?

This is what I tried so far:

(function pump () {
  return browserReadableStreamReader.read().then(({ done, value }) => {
    if (done) {
      return this.end()
    }

    this.write(value)
    return pump()
  })
}).bind(this)()

Here's what I did:

const { PassThrough } = require('stream')
/**
 * Google Chrome ReadableStream PassThrough implementation
 * @extends PassThrough
 */
class BrowserPassThrough extends PassThrough {
  /**
   * @param {Object} options - options to pass to PassThrough
   * @param {ReadableStreamDefaultReader} browserReadableStreamReader - reader
   */
  constructor (options, browserReadableStreamReader) {
    super(options)
    this.reader = browserReadableStreamReader
    this.pump()
  }

  pump () {
    this.reader.read().then(({ done, value }) => {
      if (done) {
        return this.end()
      }

      this.write(value)
      this.pump()
    })
  }
}
module.exports = BrowserPassThrough