PDF.js

PDF.js is a Portable Document Format (PDF) library that is built with HTML5.
Our goal is to create a general-purpose, web standards-based platform for
parsing and rendering PDFs.

This is a pre-built version of the PDF.js source code. It is automatically
generated by the build scripts.

For usage with older browsers/environments, without support for modern features
such as e.g. async/await, Promise, and ReadableStream,
please refer to the es5 folder.

See https://github.com/mozilla/pdf.js for learning and contributing.

针对pdf.worker.js内部代码进行了注释处理
``javascript
// 取消签章不显示
// if (data.fieldType === "Sig") {
// data.fieldValue = null;
// this.setFlags(_util.AnnotationFlag.HIDDEN);
// }
`

原来的build/转为lib/，再lib/经过es5`转换为build/解决某些项目不转换node_modules/的问题