Maybe you can use require function.

Add @types/node packages, and write require('pdfjs-dist') at the top of the your source code. So, you can modify your code like below.

Now, this code will work.

import { PDFJSStatic } from 'pdfjs-dist';
const PDFJS: PDFJSStatic = require('pdfjs-dist');
PDFJS.getDocument('helloworld.pdf').then(console.log);

I think that @types/pdfjs-dist has problems in its implementation.

I managed to get the project to compile by changing the imports as follows:
Old:

import { AnnotationEditorType, GlobalWorkerOptions, PDFDocumentProxy, PDFPageProxy, PageViewport, getDocument } from 'pdfjs-dist';
import { OnProgressParameters } from 'pdfjs-dist/types/src/display/api';
import { PDFViewerOptions } from 'pdfjs-dist/types/web/pdf_viewer';
import { LinkTarget, PDFFindController, PDFLinkService, PDFSinglePageViewer, PDFViewer } from 'pdfjs-dist/web/pdf_viewer';

New:

import { AnnotationEditorType, GlobalWorkerOptions, OnProgressParameters, PDFDocumentProxy, PDFPageProxy, PageViewport, getDocument } from 'pdfjs-dist';
import { PDFViewerOptions } from 'pdfjs-dist/types/web/pdf_viewer';
import * as pdfJs from 'pdfjs-dist/web/pdf_viewer.mjs';

But unfortunately it still doesn't work at runtime, because the GlobalWorker can not be loaded

Error: Setting up fake worker failed: "Failed to fetch dynamically imported module: http://localhost:4200/assets/pdf-js/pdf.worker.min.js".
    at :4200/vendor.js:260331:36 []
    at :4200/polyfills.js:9142:28 []
    at :4200/drainMicroTaskQueue (http://localhost:4200/polyfills.js:8480:23) []

Update:

Since writing this answer, the type definitions have been renamed to match the NPM package, and a proper export definition has been added, so you can ignore all of the below and just npm install --save-dev @types/pdf-dist.

Original Answer:

This is a consequence of bad package naming - the @types/pdf package provides types for Mozilla's PDF.js (which you can obtain via NPM using the pdfjs-dist package), not the long since abandoned pdf.

npm uninstall --save pdf
npm install --save pdfjs-dist

Additionally, it seems like the @types/pdf definitions only defines PDF.js as a global variable, not as an importable module. This is despite the fact that the library definitely supports being imported... Add the following to your project somewhere, it should fix it.

declare module "pdfjs-dist" {
    export = { PDFJS };
}

Then import PDF.js like so:

import { PDFJS } from "pdfjs-dist";

This worked for me:

• Import the package as below

  import * as pdfjsLib from "pdfjs-dist";

• Copy the pdf.worker.min.mjs file from node_modules/pdfjs-dist/build/ directory into your public folder

• Set the worker to point to the file in your public folder

  pdfjsLib.GlobalWorkerOptions.workerSrc = window.location.origin + "/pdf.worker.min.mjs";

Helpful articles:

https://medium.com/@hesseclaus/using-pdfjs-with-react-app-rewired-f1f3a2527c45

https://mozilla.github.io/pdf.js/examples/index.html#interactive-examples