3.0.7

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@push.rocks/smartstream",
-  "version": "3.0.5",
+  "version": "3.0.7",
   "private": false,
   "description": "simplifies access to node streams",
   "main": "dist_ts/index.js",

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstream',
-  version: '3.0.5',
+  version: '3.0.7',
   description: 'simplifies access to node streams'
 }

ts/index.ts

@@ -2,3 +2,5 @@ export * from './smartstream.classes.passthrough.js';
 export * from './smartstream.classes.smartduplex.js';
 export * from './smartstream.classes.streamwrapper.js';
 export * from './smartstream.classes.streamintake.js';
+
+export * from './smartstream.functions.js'

ts/smartstream.classes.passthrough.ts

@@ -13,7 +13,9 @@ export class PassThrough extends plugins.stream.Duplex {
     if (this.push(chunk, encoding)) {
       callback();
     } else {
-      this.once('drain', callback);
+      this.once('drain', () => {
+        callback();
+      });
     }
   }
 }

ts/smartstream.functions.ts

@@ -0,0 +1,26 @@
+import { Transform, type TransformCallback, type TransformOptions } from 'stream';
+
+export interface AsyncTransformFunction<TInput, TOutput> {
+  (chunkArg: TInput): Promise<TOutput>;
+}
+
+export function createTransformFunction<TInput, TOutput>(
+  asyncFunction: AsyncTransformFunction<TInput, TOutput>,
+  options?: TransformOptions
+): Transform {
+  const transformStream = new Transform({
+    ...options,
+    objectMode: true, // Ensure we operate in object mode
+    async transform(chunk: TInput, encoding: string, callback: TransformCallback) {
+      try {
+        const transformed = await asyncFunction(chunk);
+        this.push(transformed);
+        callback();
+      } catch (error) {
+        callback(error instanceof Error ? error : new Error(String(error)));
+      }
+    }
+  });
+
+  return transformStream;
+}