react warning

Hello, I have a react warning ? so i can't build my app...

```
./node_modules/pdfjs-dist/build/pdf.js
Critical dependency: require function is used in a way 
in which dependencies cannot be statically extracted   

./node_modules/pdfjs-dist/build/pdf.js
Critical dependency: require function is used in a way 
in which dependencies cannot be statically extracted   
```