fix(build): migrate filesystem access to smartfs and tighten TypeScript compatibility

ts/smarthbs.partials.ts

@@ -3,24 +3,20 @@ import * as plugins from './smarthbs.plugins.js';
 /**
  * registers a directory of partials to make them available within handlebars compilation
  */
-export let registerPartialDir = (dirPathArg: string): Promise<any> => {
-  let done = plugins.smartpromise.defer();
-  plugins.smartfile.fs.listFileTree(dirPathArg, '**/*.hbs').then((hbsFileArrayArg) => {
-    for (let hbsFilePath of hbsFileArrayArg) {
-      let parsedPath = plugins.path.parse(hbsFilePath);
-      let hbsFileString = plugins.smartfile.fs.toStringSync(
-        plugins.path.join(dirPathArg, hbsFilePath)
-      );
-      if (parsedPath.dir === '/') {
-        parsedPath.dir = '';
-      }
-      if (parsedPath.dir !== '') {
-        parsedPath.dir = parsedPath.dir + '/';
-      }
-      let partialName = `partials/${parsedPath.dir}${parsedPath.name}`;
-      plugins.handlebars.registerPartial(partialName, hbsFileString);
-      done.resolve();
-    }
-  });
-  return done.promise;
+export let registerPartialDir = async (dirPathArg: string): Promise<void> => {
+  const dirPath = plugins.path.resolve(dirPathArg);
+  const hbsFileArray = await plugins.smartFs.directory(dirPath)
+    .recursive()
+    .filter((entry) => entry.isFile && entry.name.endsWith('.hbs'))
+    .list();
+  for (const hbsFile of hbsFileArray) {
+    const relativeFilePath = plugins.path.relative(dirPath, hbsFile.path);
+    const parsedPath = plugins.path.parse(relativeFilePath);
+    const hbsFileString = await plugins.smartFs.file(hbsFile.path).encoding('utf8').read() as string;
+    const partialDir = parsedPath.dir === '.' || parsedPath.dir === ''
+      ? ''
+      : `${parsedPath.dir.split(plugins.path.sep).join('/')}/`;
+    const partialName = `partials/${partialDir}${parsedPath.name}`;
+    plugins.handlebars.registerPartial(partialName, hbsFileString);
+  }
 };