refactor: ♻️ Rewrite build system to fit the monorepo architecture

build.ts

@@ -0,0 +1,55 @@
+import process from "node:process";
+import { $, build, file, write } from "bun";
+import manifest from "./package.json" with { type: "json" };
+
+console.log("Building...");
+
+await $`rm -rf dist && mkdir dist`;
+
+const type = process.argv[2] as "api" | "worker";
+
+if (type !== "api" && type !== "worker") {
+    throw new Error("Invalid build type. Use 'api' or 'worker'.");
+}
+
+const packages = Object.keys(manifest.dependencies)
+    .filter((dep) => dep.startsWith("@versia"))
+    .filter((dep) => dep !== "@versia-server/tests");
+
+await build({
+    entrypoints: [`./${type}.ts`],
+    outdir: "dist",
+    target: "bun",
+    splitting: true,
+    minify: true,
+    external: [...packages],
+});
+
+console.log("Copying files...");
+
+// Copy each package into dist/node_modules
+for (const pkg of packages) {
+    const directory = pkg.split("/")[1] || pkg;
+    await $`mkdir -p dist/node_modules/${pkg}`;
+    // Copy the built package files
+    await $`cp -rL packages/${directory}/{dist,package.json} dist/node_modules/${pkg}`;
+
+    // Rewrite package.json "exports" field to point to the dist directory and use .js extension
+    const packageJsonPath = `dist/node_modules/${pkg}/package.json`;
+    const packageJson = await file(packageJsonPath).json();
+    for (const [key, value] of Object.entries(packageJson.exports) as [
+        string,
+        { import?: string },
+    ][]) {
+        if (value.import) {
+            packageJson.exports[key] = {
+                import: value.import
+                    .replace("./", "./dist/")
+                    .replace(/\.ts$/, ".js"),
+            };
+        }
+    }
+    await write(packageJsonPath, JSON.stringify(packageJson, null, 4));
+}
+
+console.log("Build complete!");