Sync engine (#298)

Fixes #261

plug-api/plugos-syscall/types.ts

@@ -0,0 +1,25 @@
+export type FileMeta = {
+  name: string;
+  lastModified: number;
+};
+
+export interface ProxyFileSystem {
+  readFile(
+    path: string,
+    encoding: "utf8" | "dataurl",
+  ): Promise<string>;
+
+  getFileMeta(path: string): Promise<FileMeta>;
+
+  writeFile(
+    path: string,
+    text: string,
+    encoding: "utf8" | "dataurl",
+  ): Promise<FileMeta>;
+
+  deleteFile(path: string): Promise<void>;
+
+  listFiles(
+    path: string,
+  ): Promise<FileMeta[]>;
+}