fix: Skip lipo if native module is already universal. Add native module fixtures for lipo tests (#126)

* fix: when native modules are already universal, don't lipo. adds `node-mac-permissions` fixture from https://github.com/codebytere/node-mac-permissions and resolves 3 `it.todo` test cases

* add test `different app dirs with different macho files (shim and lipo)`

* add additional test

* PR feedback

* gotta close `fd`

* use `stream` to read first 4 bytes. copy native fixture before packing into asar to leverage `unpack: "**/*.node"` properly.

* convert params to object

* rename `createTestApp` to `createStagingAppDir` and add jsdoc to the function

* compiler error from merge conflict

* update snapshots

* update snapshots

* only check x64Content since it's the tmp app

* compile macho binaries at runtime using hellow-world.c for fixtures in lipo tests

* Update jest.setup.ts

Co-authored-by: Erik Moura <erikian@erikian.dev>

* Update jest.setup.ts

Co-authored-by: Erik Moura <erikian@erikian.dev>

* remove unstable properties for specific keys

* force redo

* update snapshots

* stripping only hello-world from snapshot and only hash from macho-specific asar integrity

* optimize logic :)

---------

Co-authored-by: Erik Moura <erikian@erikian.dev>

src/asar-utils.ts

@@ -148,14 +148,13 @@ export const mergeASARs = async ({
     const x64Content = asar.extractFile(x64AsarPath, file);
     const arm64Content = asar.extractFile(arm64AsarPath, file);
 
+    // Skip file if the same content
     if (x64Content.compare(arm64Content) === 0) {
       continue;
     }
 
-    if (
-      MACHO_UNIVERSAL_MAGIC.has(x64Content.readUInt32LE(0)) &&
-      MACHO_UNIVERSAL_MAGIC.has(arm64Content.readUInt32LE(0))
-    ) {
+    // Skip universal Mach-O files.
+    if (isUniversalMachO(x64Content)) {
       continue;
     }
 
@@ -223,3 +222,7 @@ export const mergeASARs = async ({
     await Promise.all([fs.remove(x64Dir), fs.remove(arm64Dir)]);
   }
 };
+
+export const isUniversalMachO = (fileContent: Buffer) => {
+  return MACHO_UNIVERSAL_MAGIC.has(fileContent.readUInt32LE(0));
+};