fix(build): include better-sqlite3 prebuilds in standalone bun bundle (#8847)

Refs: base-red #9737

changelog.d/fixes/8847-bun-prebuilds.md

@@ -0,0 +1 @@
+- fix(build): include better-sqlite3 prebuilds in standalone bun bundle

scripts/build/assembleStandalone.mjs

@@ -89,6 +89,15 @@ const NATIVE_ASSET_ENTRIES = [
     src: ["node_modules", "better-sqlite3", "build"],
     dest: ["node_modules", "better-sqlite3", "build"],
   },
+  {
+    // #8847: Bun (and npx -g global installs) resolve better-sqlite3's native
+    // binary from prebuilds/ instead of build/Release/, so the compiled build/
+    // copy alone leaves a hollow package that falls back to sql.js (OOM under
+    // Bun). Ship the prebuilds alongside the compiled binary.
+    label: "better-sqlite3 prebuilds (Bun / global installs)",
+    src: ["node_modules", "better-sqlite3", "prebuilds"],
+    dest: ["node_modules", "better-sqlite3", "prebuilds"],
+  },
   {
     // TPROXY IP_TRANSPARENT addon (Fase 3 / Epic A). Built by build-tproxy-native
     // before assembly; Linux-only + opt-in, so the source is absent on non-Linux

tests/unit/repro-8847.test.ts

@@ -0,0 +1,70 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { syncStandaloneNativeAssets } from "../../scripts/build/assembleStandalone.mjs";
+
+/**
+ * Repro #8847: better-sqlite3 prebuilds are not included in the standalone
+ * bundle, so the bundled app fails when the platform's prebuild is needed
+ * (e.g. under Bun, which resolves the native binary via prebuilds/ rather
+ * than build/Release/).
+ *
+ * The test creates a synthetic node_modules/better-sqlite3/ tree with both
+ * the compiled build/Release/ binary AND the prebuilds/ directory, then
+ * confirms that syncStandaloneNativeAssets copies both into the standalone
+ * output. On the unfixed code this fails because NATIVE_ASSET_ENTRIES only
+ * lists better-sqlite3/build/.
+ */
+test("repro-8847: better-sqlite3 prebuilds are bundled alongside the compiled binary", async () => {
+  const tmp = fs.mkdtempSync(path.join(os.tmpdir(), "repro-8847-"));
+  const projectRoot = path.join(tmp, "src-root");
+
+  // Seed better-sqlite3 with both build/Release/ and prebuilds/.
+  const bsqlDir = path.join(projectRoot, "node_modules", "better-sqlite3");
+  fs.mkdirSync(path.join(bsqlDir, "build", "Release"), { recursive: true });
+  fs.writeFileSync(
+    path.join(bsqlDir, "build", "Release", "better_sqlite3.node"),
+    "// native binary placeholder"
+  );
+  fs.mkdirSync(path.join(bsqlDir, "prebuilds"), { recursive: true });
+  for (const target of [
+    "darwin-arm64.node",
+    "darwin-x64.node",
+    "linux-arm64.node",
+    "linux-x64.node",
+    "linuxmusl-arm64.node",
+    "linuxmusl-x64.node",
+    "win32-arm64.node",
+    "win32-x64.node",
+  ]) {
+    fs.writeFileSync(path.join(bsqlDir, "prebuilds", target), `// ${target}`);
+  }
+
+  const outDir = path.join(tmp, "standalone");
+  fs.mkdirSync(outDir, { recursive: true });
+
+  // Act: copy native assets into the standalone output.
+  await syncStandaloneNativeAssets(projectRoot, fs.promises, { log() {} }, outDir);
+
+  // Assert: the compiled build/Release/ binary was copied.
+  assert.ok(
+    fs.existsSync(
+      path.join(outDir, "node_modules", "better-sqlite3", "build", "Release", "better_sqlite3.node")
+    ),
+    "compiled native binary (build/Release/) must be in the standalone bundle"
+  );
+
+  // Assert: the prebuilds/ directory was also copied.
+  const prebuildsDir = path.join(outDir, "node_modules", "better-sqlite3", "prebuilds");
+  assert.ok(fs.existsSync(prebuildsDir), "prebuilds/ directory must be in the standalone bundle");
+
+  // Assert: at least one prebuild file was copied.
+  assert.ok(
+    fs.existsSync(path.join(prebuildsDir, "linux-x64.node")),
+    "linux-x64 prebuild must be in the standalone bundle"
+  );
+
+  fs.rmSync(tmp, { recursive: true, force: true });
+});