Build installer and management site from spec

src/shared/mojang.ts

@@ -0,0 +1,30 @@
+import { MinecraftRelease } from './types'
+
+const VERSION_MANIFEST_URL = 'https://launchermeta.mojang.com/mc/game/version_manifest.json'
+
+let cachedReleases: MinecraftRelease[] | null = null
+
+export async function fetchReleaseVersions(): Promise<MinecraftRelease[]> {
+  if (cachedReleases != null) {
+    return cachedReleases
+  }
+
+  try {
+    const response = await fetch(VERSION_MANIFEST_URL)
+    if (!response.ok) {
+      throw new Error(`Failed to fetch versions: ${response.status}`)
+    }
+
+    const payload = await response.json() as { versions?: MinecraftRelease[] }
+    cachedReleases = (payload.versions ?? []).filter((entry) => entry.type === 'release')
+    return cachedReleases
+  } catch {
+    cachedReleases = [
+      { id: '1.21.4', type: 'release' },
+      { id: '1.21.1', type: 'release' },
+      { id: '1.20.6', type: 'release' },
+      { id: '1.20.1', type: 'release' }
+    ]
+    return cachedReleases
+  }
+}