refactor(pdf): force dark mode

scripts/pdf.js

@@ -43,7 +43,7 @@ async function startUpgrade() {
   await Promise.all(files.map(p => exists(path.join(__dirname, repoRoot, p))))
 
   shell.echo('\nModifying files.')
-  await Promise.all([modifyPDFJS(), modifyPDFWorker(), modifyViewrJS(), modifyViewerHTML()])
+  await Promise.all([modifyViewrJS(), modifyViewerHTML()])
 
   await fs.ensureDir(publicPDFRoot)
 
@@ -59,24 +59,6 @@ async function startUpgrade() {
   shell.echo('\ndone.')
 }
 
-async function modifyPDFJS() {
-  const pdfPath = path.join(__dirname, repoRoot, 'build/pdf.js')
-  let file = await fs.readFile(pdfPath, 'utf8')
-
-  file = removeRegeneratorPolyfill('pdf.js', file)
-
-  await fs.writeFile(pdfPath, file)
-}
-
-async function modifyPDFWorker() {
-  const workerPath = path.join(__dirname, repoRoot, 'build/pdf.worker.js')
-  let file = await fs.readFile(workerPath, 'utf8')
-
-  file = removeRegeneratorPolyfill('pdf.worker.js', file)
-
-  await fs.writeFile(workerPath, file)
-}
-
 async function modifyViewrJS() {
   const viewerPath = path.join(__dirname, repoRoot, 'web/viewer.js')
   let file = await fs.readFile(viewerPath, 'utf8')
@@ -104,20 +86,17 @@ async function modifyViewrJS() {
     '/* saladict */let validateFileURL = () => {};'
   )
 
-  file = removeRegeneratorPolyfill('viewer.js', file)
+  // force dark mode
+  const viewCssTester = /"viewerCssTheme": 0,/
+  if (!viewCssTester.test(file)) {
+    shell.echo('Could not locate viewerCssTheme config in viewer.js')
+    shell.exit(1)
+  }
+  file = file.replace(viewCssTester, '"viewerCssTheme": 2, /* saladict */')
 
   await fs.writeFile(viewerPath, file)
 }
 
-function removeRegeneratorPolyfill(name, file) {
-  // remove regenerator polyfill which triggers 'unsafe-eval' CSP
-  const regeneratorTester = /(^| )Function\("r"/
-  if (!regeneratorTester.test(file)) {
-    shell.echo(`Could not locate regenerator polyfill in ${name}`)
-  }
-  return file.replace(regeneratorTester, '/* saladict */ // Function("r"')
-}
-
 async function modifyViewerHTML() {
   const viewerPath = path.join(__dirname, repoRoot, 'web/viewer.html')
   let file = await fs.readFile(viewerPath, 'utf8')