fix(core): update

ts/smartfile.fs.ts

@@ -202,6 +202,10 @@ export const toStringSync = (filePath: string): string => {
   return fileString;
 };
 
+export const toBuffer = async (filePath: string): Promise<Buffer> => {
+  return plugins.fsExtra.readFile(filePath);
+};
+
 export const toBufferSync = (filePath: string): Buffer => {
   return plugins.fsExtra.readFileSync(filePath);
 };