promisify syncfs (#78)

Author: eagleoflqj

page/fs.ts

@@ -60,11 +60,21 @@ export function mount() {
   Module.FS.mount(Module.IDBFS, { autoPersist: true }, HOME_MOUNT_POINT)
 }
 
-export function reset() {
+export function sync(direction: 'load' | 'save') {
   const { promise, resolve } = Promise.withResolvers<void>()
+  Module.FS.syncfs(direction === 'load', (err) => {
+    if (err) {
+      console.error(err)
+    }
+    // Before better understanding possible errors, don't break core functionalities, which don't rely on IDBFS.
+    resolve()
+  })
+  return promise
+}
+
+export function reset() {
   rmR(USR_MOUNT_POINT)
   rmR(HOME_MOUNT_POINT)
   // Manually trigger syncfs to ensure data is cleared.
-  Module.FS.syncfs(false, () => resolve())
-  return promise
+  return sync('save')
 }

page/index.ts

@@ -184,10 +184,7 @@ for (const api of apis) {
 
 Module.onRuntimeInitialized = () => {
   mount()
-  Module.FS.syncfs(true, () => {
-    restorePlugins()
-    resolve(null)
-  })
+  restorePlugins().then(resolve)
 }
 
 export {

page/plugin.ts

@@ -1,6 +1,6 @@
 import UZIP from 'uzip'
 import { hasTouch } from './context'
-import { lsDir, traverseSync, USR_MOUNT_POINT } from './fs'
+import { lsDir, sync, traverseSync, USR_MOUNT_POINT } from './fs'
 import { getLocale } from './locale'
 import Module from './module'
 
@@ -77,7 +77,8 @@ export function installPlugin(buffer: ArrayBuffer) {
 }
 
 // Symlink all plugins' files from /backup/usr to /usr.
-export function restorePlugins() {
+export async function restorePlugins() {
+  await sync('load')
   traverseSync((backupPath) => {
     const path = `/usr${backupPath.slice(USR_MOUNT_POINT.length)}`
     Module.FS.mkdirTree(path)