pdfmake/js/OutputDocument.js

Client/server side PDF printing in pure JavaScript

"use strict";

exports.__esModule = true;
exports.default = void 0;
class OutputDocument {
  /**
   * @param {Promise<object>} pdfDocumentPromise
   */
  constructor(pdfDocumentPromise) {
    this.bufferSize = 1073741824;
    this.pdfDocumentPromise = pdfDocumentPromise;
    this.bufferPromise = null;
  }

  /**
   * @returns {Promise<object>}
   */
  getStream() {
    return this.pdfDocumentPromise;
  }

  /**
   * @returns {Promise<Buffer>}
   */
  getBuffer() {
    const getBufferInternal = async () => {
      const stream = await this.getStream();
      return new Promise(resolve => {
        let chunks = [];
        stream.on('readable', () => {
          let chunk;
          while ((chunk = stream.read(this.bufferSize)) !== null) {
            chunks.push(chunk);
          }
        });
        stream.on('end', () => {
          resolve(Buffer.concat(chunks));
        });
        stream.end();
      });
    };
    if (this.bufferPromise === null) {
      this.bufferPromise = getBufferInternal();
    }
    return this.bufferPromise;
  }

  /**
   * @returns {Promise<string>}
   */
  async getBase64() {
    const buffer = await this.getBuffer();
    return buffer.toString('base64');
  }

  /**
   * @returns {Promise<string>}
   */
  async getDataUrl() {
    const data = await this.getBase64();
    return 'data:application/pdf;base64,' + data;
  }
}
var _default = exports.default = OutputDocument;