fix: internalModuleReadJSON for unpacked JSON (#26751)

lib/asar/fs-wrapper.ts

@@ -686,7 +686,8 @@ export const wrapFsWithAsar = (fs: Record<string, any>) => {
     if (info.size === 0) return ['', false];
     if (info.unpacked) {
       const realPath = archive.copyFileOut(filePath);
-      return fs.readFileSync(realPath, { encoding: 'utf8' });
+      const str = fs.readFileSync(realPath, { encoding: 'utf8' });
+      return [str, str.length > 0];
     }
 
     logASARAccess(asarPath, filePath, info.offset);

spec/asar-spec.js

@@ -1444,7 +1444,8 @@ describe('asar package', function () {
 
       it('reads a normal file with unpacked files', function () {
         const p = path.join(asarDir, 'unpack.asar', 'a.txt');
-        expect(internalModuleReadJSON(p).toString().trim()).to.equal('a');
+        const [s, c] = internalModuleReadJSON(p);
+        expect([s.toString().trim(), c]).to.eql(['a', true]);
       });
     });