chore: tune tsdown configuration to reduce bundle size (#5)

* chore: tune tsdown configuration to reduce bundle size

* fix: resolve TypeScript path aliases in tsdown bundler

Modified the external function in tsdown configs to properly handle @/ path aliases:
- Added check to prevent @/ imports from being treated as external dependencies
- This allows tsdown to resolve these paths to actual file paths during bundling
- Applied to both @databricks/app-kit and @databricks/app-kit-ui packages

The issue was that the regex /^[^./]/ was marking all non-relative imports
(including @/ aliases) as external, preventing proper resolution.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>
Signed-off-by: Fabian Jakobs <[email protected]>

---------

Signed-off-by: Fabian Jakobs <[email protected]>
Co-authored-by: Claude <[email protected]>

Author: fjakobs

packages/app-kit-ui/tsdown.config.ts

@@ -15,9 +15,13 @@ export default defineConfig([
     hash: false,
     unbundle: true,
     format: "esm",
-    skipNodeModulesBundle: true,
     noExternal: ["shared"],
-    external: ["react", "react-dom", "recharts"],
+    external: (id) => {
+      // Bundle "shared" workspace package and @/ path aliases
+      if (id === "shared" || id.startsWith("shared/")) return false;
+      if (id.startsWith("@/")) return false;
+      return /^[^./]/.test(id) || id.includes("/node_modules/");
+    },
     tsconfig: "./tsconfig.json",
     exports: {
       devExports: "development",

packages/app-kit/tsdown.config.ts

@@ -14,11 +14,15 @@ export default defineConfig([
       resolve: true,
     },
     sourcemap: false,
-    skipNodeModulesBundle: true,
     clean: false,
     unbundle: true,
     noExternal: ["shared"],
-    external: ["vite", "@vitejs/plugin-react"],
+    external: (id) => {
+      // Bundle "shared" workspace package and @/ path aliases
+      if (id === "shared" || id.startsWith("shared/")) return false;
+      if (id.startsWith("@/")) return false;
+      return /^[^./]/.test(id) || id.includes("/node_modules/");
+    },
     tsconfig: "./tsconfig.json",
     copy: [
       {