refactor(dx/server): extract basic build commands to separate file

scripts/build-utils.ts

@@ -0,0 +1,28 @@
+import { rmSync } from "fs";
+import { copySync, emptyDirSync, mkdirpSync } from "fs-extra";
+import { join } from "path";
+
+export default class BuildHelper {
+
+    private projectDir: string;
+    private outDir: string;
+
+    constructor(projectPath: string) {
+        this.projectDir = join(__dirname, "..", projectPath);
+        this.outDir = join(this.projectDir, "dist");
+
+        emptyDirSync(this.outDir);
+    }
+
+    copy(projectDirPath: string, outDirPath: string) {
+        if (outDirPath.endsWith("/")) {
+            mkdirpSync(join(outDirPath));
+        }
+        copySync(join(this.projectDir, projectDirPath), join(this.outDir, outDirPath), { dereference: true });
+    }
+
+    deleteFromOutput(path: string) {
+        rmSync(join(this.outDir, path), { recursive: true });
+    }
+
+}