Parallel font loading

(cherry picked from commit 10e2b05b575bbbf8b0ca5b4a336817cd902d712b)

src/App.native.tsx

@@ -55,8 +55,9 @@ import {TestCtrls} from '#/view/com/testing/TestCtrls'
 import {Provider as VideoVolumeProvider} from '#/view/com/util/post-embeds/VideoVolumeContext'
 import * as Toast from '#/view/com/util/Toast'
 import {Shell} from '#/view/shell'
-import {ThemeProvider as Alf, useFonts} from '#/alf'
+import {ThemeProvider as Alf} from '#/alf'
 import {useColorModeTheme} from '#/alf/util/useColorModeTheme'
+import {useFonts} from '#/alf/util/useFonts'
 import {NuxDialogs} from '#/components/dialogs/nuxs'
 import {useStarterPackEntry} from '#/components/hooks/useStarterPackEntry'
 import {Provider as IntentDialogProvider} from '#/components/intents/IntentDialogs'

src/App.web.tsx

@@ -46,8 +46,9 @@ import {Provider as VideoVolumeProvider} from '#/view/com/util/post-embeds/Video
 import * as Toast from '#/view/com/util/Toast'
 import {ToastContainer} from '#/view/com/util/Toast.web'
 import {Shell} from '#/view/shell/index'
-import {ThemeProvider as Alf, useFonts} from '#/alf'
+import {ThemeProvider as Alf} from '#/alf'
 import {useColorModeTheme} from '#/alf/util/useColorModeTheme'
+import {useFonts} from '#/alf/util/useFonts'
 import {NuxDialogs} from '#/components/dialogs/nuxs'
 import {useStarterPackEntry} from '#/components/hooks/useStarterPackEntry'
 import {Provider as IntentDialogProvider} from '#/components/intents/IntentDialogs'

src/alf/fonts.ts

@@ -1,6 +1,6 @@
 import {useFonts as defaultUseFonts} from 'expo-font'
 
-import {isNative, isWeb} from '#/platform/detection'
+import {isWeb} from '#/platform/detection'
 import {Device, device} from '#/storage'
 
 const FAMILIES = `-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Liberation Sans", Helvetica, Arial, sans-serif`
@@ -35,15 +35,16 @@ export function setFontFamily(fontFamily: Device['fontFamily']) {
 }
 
 /*
- * Unused fonts are commented out, but the files are there if we need them.
+ * IMPORTANT: This is unused. Expo statically extracts these fonts, but we load
+ * them manually so that we can parallelize the loading along with the JS
+ * bundle.
+ *
+ * See `#/alf/util/useFonts` for the actually used hooks.
+ *
+ * All used fonts MUST be configured here. Unused fonts are commented out, but
+ * the files are there if we need them.
  */
-export function useFonts() {
-  /**
-   * For native, the `expo-font` config plugin embeds the fonts in the
-   * application binary. But `expo-font` isn't supported on web, so we fall
-   * back to async loading here.
-   */
-  if (isNative) return [true, null]
+export function DO_NOT_USE() {
   return defaultUseFonts({
     // 'Inter-Thin': require('../../assets/fonts/inter/Inter-Thin.otf'),
     // 'Inter-ThinItalic': require('../../assets/fonts/inter/Inter-ThinItalic.otf'),

src/alf/util/useFonts.ts

@@ -0,0 +1,8 @@
+export function useFonts() {
+  /**
+   * For native, the `expo-font` config plugin embeds the fonts in the
+   * application binary. But `expo-font` isn't supported on web, so we fall
+   * back to async loading here.
+   */
+  return [true, null]
+}

src/alf/util/useFonts.web.ts

@@ -0,0 +1,13 @@
+import React from 'react'
+
+export function useFonts() {
+  const [loaded, setLoaded] = React.useState(false)
+
+  React.useEffect(() => {
+    document.fonts.ready.then(() => {
+      setLoaded(true)
+    })
+  }, [setLoaded])
+
+  return [loaded, null]
+}