Question

我正在使用pdf-kit生成Web到PDF。为此，我通过npm在angular（最新版本）中安装了这些软件包，该软件包使用了一些库，例如“ fs，stream，zlib，..”。

为此，当我运行ng服务时，它显示出许多错误，例如：

Can't resolve 'fs' in '\node_modules\..'
Can't resolve 'stream' in '\node_modules\..'

要绕过这个问题，我在package.json中添加了特定条目。现在， ng服务运行正常，但在浏览器控制台上出现运行时错误：

Uncaught TypeError: Cannot read property 'prototype' of undefined
    at __extends (EncodeStream.js:5)
    at EncodeStream.js:18
    at Object.<anonymous> (EncodeStream.js:147)
    at Object../node_modules/restructure/src/EncodeStream.js (EncodeStream.js:151)
    at __webpack_require__ (bootstrap:79)
    at Object.<anonymous> (index.js:5)
    at Object../node_modules/restructure/index.js (index.js:43)
    at __webpack_require__ (bootstrap:79)
    at Object../node_modules/fontkit/index.js (index.js:5)
    at __webpack_require__ (bootstrap:79)

component.ts文件：

import * as pdfkit from 'pdfkit';
import * as blobstream from 'blob-stream';

export class MyComponent implements OnInit {

  //Some code..

  downloadPDF(){
    var doc=new pdfkit();
    var stream= doc.pipe(blobstream());
    doc.fontSize(25).text('Test PDF !',100,100);
    doc.circle(280,200,50).fill("#6600FF");
    doc.end();
    stream.on('finish', function(){
      window.open(stream.toBlobURL('application/pdf'));
    });
  }

}

非常感谢任何帮助。

未捕获的TypeError：无法读取未定义的EncodeStream.js的属性“原型”

0 个答案: