@antora/assembler/lib/util/lazy-readable.js

A JavaScript library that merges AsciiDoc content from multiple pages in an Antora site into assembly files and delegates to an exporter to convert those files to another format, such as PDF.

'use strict'

const { PassThrough } = require('node:stream')

// adapted from https://github.com/jpommerening/node-lazystream/blob/master/lib/lazystream.js | license: MIT
class LazyReadable extends PassThrough {
  constructor (fn, options) {
    super(options)
    this._read = function () {
      delete this._read // restores original method
      fn.call(this, options).on('error', this.emit.bind(this, 'error')).pipe(this)
      return this._read.apply(this, arguments)
    }
    this.emit('readable')
  }
}

module.exports = LazyReadable