ENG-428 Cross-platform build script in packages/database (#197)

* Build script

* race condition identified by coderabbit

* nitpicks from coderabbit

Author: maparent

packages/database/package.json

@@ -14,7 +14,7 @@
     "check-types": "npm run lint && supabase stop && npm run dbdiff",
     "lint": "tsx scripts/lint.ts",
     "lint:fix": "tsx scripts/lint.ts -f",
-    "build": "if [ $HOME != '/vercel' ]; then\n supabase start && supabase migrations up && (supabase gen types typescript --local --schema public > types.gen.ts)\nfi",
+    "build": "tsx scripts/build.ts",
     "gentypes:production": "supabase start && supabase gen types typescript --project-id \"$SUPABASE_PROJECT_ID\" --schema public > types.gen.ts",
     "dbdiff": "supabase stop && supabase db diff",
     "dbdiff:save": "supabase stop && supabase db diff -f",

packages/database/scripts/build.ts

@@ -0,0 +1,19 @@
+import { execSync } from "node:child_process";
+import { writeFileSync } from "fs"
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const projectRoot = join(__dirname, '..');
+
+if (process.env.HOME !== '/vercel') {
+  try {
+    execSync('supabase start');
+    execSync('supabase migrations up');
+    const stdout = execSync('supabase gen types typescript --local --schema public', { encoding: 'utf8' });
+    writeFileSync(join(projectRoot, 'types.gen.ts'), stdout);
+  } catch (err) {
+    console.error(err);
+    throw err;
+  }
+}