Feature: pngx PDF viewer with updated pdfjs (#4679)

src-ui/src/app/components/common/pdf-viewer/typings.ts

@@ -0,0 +1,17 @@
+export type PDFPageProxy =
+  import('pdfjs-dist/types/src/display/api').PDFPageProxy
+export type PDFSource =
+  import('pdfjs-dist/types/src/display/api').DocumentInitParameters
+export type PDFDocumentProxy =
+  import('pdfjs-dist/types/src/display/api').PDFDocumentProxy
+export type PDFDocumentLoadingTask =
+  import('pdfjs-dist/types/src/display/api').PDFDocumentLoadingTask
+export type PDFViewerOptions =
+  import('pdfjs-dist/types/web/pdf_viewer').PDFViewerOptions
+
+export interface PDFProgressData {
+  loaded: number
+  total: number
+}
+
+export type ZoomScale = 'page-height' | 'page-fit' | 'page-width'