Merge pull request Expensify#68332 from callstack-internal/remove-legacy-pdf-worker

Remove legacy pdf worker to reduce bundle size

Author: mountiny

config/webpack/webpack.common.ts

@@ -189,19 +189,12 @@ const getCommonConfiguration = ({file = '.env', platform = 'web'}: Environment):
                      */
                     exclude: [new RegExp(`node_modules/(?!(${includeModules})/).*|.native.js$`)],
                 },
-
                 // We are importing this worker as a string by using asset/source otherwise it will default to loading via an HTTPS request later.
                 // This causes issues if we have gone offline before the pdfjs web worker is set up as we won't be able to load it from the server.
                 {
-                    // eslint-disable-next-line prefer-regex-literals
                     test: new RegExp('node_modules/pdfjs-dist/build/pdf.worker.min.mjs'),
                     type: 'asset/source',
                 },
-                {
-                    // eslint-disable-next-line prefer-regex-literals
-                    test: new RegExp('node_modules/pdfjs-dist/legacy/build/pdf.worker.min.mjs'),
-                    type: 'asset/source',
-                },
 
                 // Rule for react-native-web-webview
                 {

src/components/PDFThumbnail/index.tsx

@@ -1,24 +1,17 @@
 import 'core-js/proposals/promise-with-resolvers';
 // eslint-disable-next-line import/extensions
 import pdfWorkerSource from 'pdfjs-dist/build/pdf.worker.min.mjs';
-// eslint-disable-next-line import/extensions
-import pdfWorkerLegacySource from 'pdfjs-dist/legacy/build/pdf.worker.min.mjs';
 import React, {useMemo, useState} from 'react';
 import {View} from 'react-native';
 import {Document, pdfjs, Thumbnail} from 'react-pdf';
 import FullScreenLoadingIndicator from '@components/FullscreenLoadingIndicator';
 import useThemeStyles from '@hooks/useThemeStyles';
 import addEncryptedAuthTokenToURL from '@libs/addEncryptedAuthTokenToURL';
-import {isMobileSafari, isModernSafari} from '@libs/Browser';
 import PDFThumbnailError from './PDFThumbnailError';
 import type PDFThumbnailProps from './types';
 
-const shouldUseLegacyWorker = isMobileSafari() && !isModernSafari();
-// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
-const pdfWorker = shouldUseLegacyWorker ? pdfWorkerLegacySource : pdfWorkerSource;
-
 if (!pdfjs.GlobalWorkerOptions.workerSrc) {
-    pdfjs.GlobalWorkerOptions.workerSrc = URL.createObjectURL(new Blob([pdfWorker], {type: 'text/javascript'}));
+    pdfjs.GlobalWorkerOptions.workerSrc = URL.createObjectURL(new Blob([pdfWorkerSource], {type: 'text/javascript'}));
 }
 
 function PDFThumbnail({previewSourceURL, style, isAuthTokenRequired = false, enabled = true, onPassword, onLoadError, onLoadSuccess}: PDFThumbnailProps) {

src/types/modules/pdf.worker.d.ts

@@ -1,2 +1 @@
-declare module 'pdfjs-dist/legacy/build/pdf.worker.min.mjs';
 declare module 'pdfjs-dist/build/pdf.worker.min.mjs';