@opendevise/antora-office-to-pdf-extension/lib/lazy-readable.js

An Antora extension that converts office files (.doc, .docx, .rtf, etc.) in the attachments family to PDF using either LibreOffice or Microsoft Office via docto and updates the file metadata so references point to the converted PDF file.

'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