Refactor PDF conversion utilities and update Linux build script

- Removed unnecessary external dependencies from the Linux binary build script to streamline the build process.
- Simplified the import mechanism for the `pdf-to-img` and `sharp` modules in the PDF conversion utilities, enhancing module loading efficiency.

scripts/build-linux-binary.mjs

@@ -26,15 +26,6 @@ const result = await Bun.build({
   outdir: path.join(rootDir, "build/linux-bundle"),
   target: "bun",
   format: "esm",
-  external: [
-    "sharp",
-    "canvas",
-    "@napi-rs/canvas",
-    "pdf-to-img",
-    "pdfjs-dist",
-    "@img/*",
-    "@napi-rs/*",
-  ],
   define: {
     "process.env.FC_PACKAGE_VERSION": JSON.stringify(packageJson.version),
     "process.env.FC_BUILD_NUMBER": JSON.stringify(buildNumber),

src/pdfUtils.js

@@ -1,25 +1,15 @@
 /**
  * PDF conversion utilities loaded on demand so headless startup
- * does not require ESM-only pdf-to-img at module load time.
+ * does not require pdf-to-img at module load time.
  */
-import { pathToFileURL } from "node:url";
-import { createRequire } from "node:module";
-
-const require = createRequire(import.meta.url);
-
-async function importPackage(name) {
-  const packagePath = require.resolve(name);
-  return import(pathToFileURL(packagePath).href);
-}
-
 function resolveDefault(module) {
   return module?.default ?? module;
 }
 
 export async function convertPDFToImage(pdfInput, options = {}) {
   const [pdfToImgModule, sharpModule] = await Promise.all([
-    importPackage("pdf-to-img"),
-    importPackage("sharp"),
+    import("pdf-to-img"),
+    import("sharp"),
   ]);
   const { pdf } = pdfToImgModule;
   const sharp = resolveDefault(sharpModule);