Expose build metadata through vite

Author: Flowm

src/composables/usePostHog.ts

@@ -15,6 +15,10 @@ export function usePostHog() {
         cookieless_mode: "always",
         defaults: "2026-01-30",
       });
+      posthog.register({
+        build_date: __BUILD_DATE__,
+        build_sha: __BUILD_SHA__,
+      });
     }
     initialized = true;
   }

src/env.d.ts

@@ -1,2 +1,5 @@
 /// <reference types="vite/client" />
 /// <reference types="vite-plugin-pwa/client" />
+
+declare const __BUILD_DATE__: string;
+declare const __BUILD_SHA__: string;

vite.config.js

@@ -3,11 +3,15 @@ import vue from "@vitejs/plugin-vue";
 import { viteStaticCopy } from "vite-plugin-static-copy";
 import { VitePWA } from "vite-plugin-pwa";
 import path from "path";
+import { execSync } from "child_process";
 
 const cesiumEngineSource = "node_modules/@cesium/engine";
 const cesiumWidgetsSource = "node_modules/@cesium/widgets";
 const cesiumBaseUrl = "cesium";
 
+const buildDate = new Date().toISOString().replace(/\.\d{3}Z$/, "Z");
+const buildSha = execSync("git rev-parse --short HEAD").toString().trim();
+
 export default defineConfig({
   base: "",
   build: {
@@ -50,6 +54,8 @@ export default defineConfig({
   define: {
     // Define relative base path in cesium for loading assets
     CESIUM_BASE_URL: JSON.stringify("./cesium"),
+    __BUILD_DATE__: JSON.stringify(buildDate),
+    __BUILD_SHA__: JSON.stringify(buildSha),
   },
   plugins: [
     vue(),