data duplicator works in simple case

packages/tools/src/createAsyncWriteStream.ts

@@ -0,0 +1,41 @@
+import _intersection from 'lodash/intersection';
+import _isArray from 'lodash/isArray';
+import { getLogger } from './getLogger';
+
+const logger = getLogger('asyncWriteStream');
+
+export interface AsyncWriteStreamOptions {
+  processItem: (chunk: any) => Promise<void>;
+}
+
+export function createAsyncWriteStream(stream, options: AsyncWriteStreamOptions): any {
+  const writable = new stream.Writable({
+    objectMode: true,
+  });
+
+  writable._write = async (chunk, encoding, callback) => {
+    await options.processItem(chunk);
+
+    // const { sql, id, newIdSql } = chunk;
+    // if (_isArray(sql)) {
+    //   for (const item of sql) await driver.query(pool, item, { discardResult: true });
+    // } else {
+    //   await driver.query(pool, sql, { discardResult: true });
+    // }
+    // if (newIdSql) {
+    //   const res = await driver.query(pool, newIdSql);
+    //   const resId = Object.entries(res?.rows?.[0])?.[0]?.[1];
+
+    //   if (options?.mapResultId) {
+    //     options?.mapResultId(id, resId as string);
+    //   }
+    // }
+    callback();
+  };
+
+  // writable._final = async callback => {
+  //   callback();
+  // };
+
+  return writable;
+}