feat(config): add development environment constant and enhance font loading logic

- Introduced a global constant `__DEV__` to indicate the development environment in the Vite configuration.
- Updated the `OgService` to conditionally include additional font paths when in development mode, improving font loading flexibility.
- Refactored font loading logic to check for file existence before attempting to read, enhancing reliability.

Signed-off-by: Innei <tukon479@gmail.com>

be/apps/core/src/global.d.ts

@@ -1 +1,5 @@
 import 'vite/client'
+
+declare global {
+  const __DEV__: boolean
+}

be/apps/core/src/modules/content/og/og.service.ts

@@ -1,4 +1,4 @@
-import { readFile } from 'node:fs/promises'
+import { readFile, stat } from 'node:fs/promises'
 import { resolve } from 'node:path'
 
 import type { PhotoManifestItem } from '@afilmory/builder'
@@ -21,6 +21,19 @@ interface ThumbnailCandidateResult {
   contentType: string
 }
 
+const GeistFontCandidates = [
+  resolve(process.cwd(), `./${geistFontUrl}`),
+  resolve(process.cwd(), `./dist/${geistFontUrl}`),
+]
+
+if (__DEV__) {
+  GeistFontCandidates.push(
+    resolve(process.cwd(), `./be/apps/core/src/modules/content/og/assets/Geist-Medium.ttf`),
+    resolve(process.cwd(), `./apps/core/src/modules/content/og/assets/Geist-Medium.ttf`),
+    resolve(process.cwd(), `./core/src/modules/content/og/assets/Geist-Medium.ttf`),
+  )
+}
+
 @injectable()
 export class OgService implements OnModuleDestroy {
   private fontConfig: SatoriOptions['fonts'] | null = null
@@ -76,19 +89,23 @@ export class OgService implements OnModuleDestroy {
     return new Response(body, { status: 200, headers })
   }
 
-  // private cjkFontPromise: Promise<NonSharedBuffer> | null = null
   private geistFontPromise: Promise<NonSharedBuffer> | null = null
 
-  loadFonts() {
+  async loadFonts() {
     if (!this.geistFontPromise) {
-      // this.cjkFontPromise = readFile(resolve(process.cwd(), `./${cjkFontUrl}`))
-      this.geistFontPromise = readFile(resolve(process.cwd(), `./${geistFontUrl}`))
+      for (const candidate of GeistFontCandidates) {
+        const stats = await stat(candidate)
+        if (stats.isFile()) {
+          this.geistFontPromise = readFile(candidate)
+          break
+        }
+      }
     }
     this.resetFontCleanupTimer()
   }
 
   private async getFontConfig(): Promise<SatoriOptions['fonts']> {
-    this.loadFonts()
+    await this.loadFonts()
 
     return [
       {

be/apps/core/vite.config.ts

@@ -135,6 +135,9 @@ export default defineConfig({
       '@afilmory/be-utils/': `${resolve(__dirname, '../../packages/utils/src')}/`,
     },
   },
+  define: {
+    __DEV__: JSON.stringify(process.env.NODE_ENV === 'development'),
+  },
   ssr: {
     noExternal: true,
     external,