3.0.36

assets/denoentry.ts

@@ -0,0 +1 @@
+console.log('Hello from deno');

npmextra.json

@@ -6,12 +6,34 @@
   "gitzone": {
     "projectType": "npm",
     "module": {
-      "githost": "gitlab.com",
+      "githost": "code.foss.global",
       "gitscope": "push.rocks",
       "gitrepo": "smartstream",
-      "description": "simplifies access to node streams",
+      "description": "A library to simplify the creation and manipulation of Node.js streams, providing utilities for handling transform, duplex, and readable/writable streams effectively in TypeScript.",
       "npmPackagename": "@push.rocks/smartstream",
-      "license": "MIT"
+      "license": "MIT",
-    }
+      "keywords": [
+        "stream",
+        "node.js",
+        "typescript",
+        "stream manipulation",
+        "data processing",
+        "pipeline",
+        "async transformation",
+        "event handling",
+        "backpressure",
+        "readable stream",
+        "writable stream",
+        "duplex stream",
+        "transform stream",
+        "file streaming",
+        "buffer",
+        "stream utilities",
+        "esm"
+      ]
+    }
+  },
+  "tsdoc": {
+    "legal": "\n## License and Legal Information\n\nThis repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository. \n\n**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.\n\n### Trademarks\n\nThis project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.\n\n### Company Information\n\nTask Venture Capital GmbH  \nRegistered at District court Bremen HRB 35230 HB, Germany\n\nFor any legal inquiries or if you require further information, please contact us via email at hello@task.vc.\n\nBy using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.\n"
   }
 }

package.json

@@ -1,8 +1,8 @@
 {
   "name": "@push.rocks/smartstream",
-  "version": "3.0.22",
+  "version": "3.0.36",
   "private": false,
-  "description": "simplifies access to node streams",
+  "description": "A library to simplify the creation and manipulation of Node.js streams, providing utilities for handling transform, duplex, and readable/writable streams effectively in TypeScript.",
   "main": "dist_ts/index.js",
   "typings": "dist_ts/index.d.ts",
   "type": "module",
@@ -22,17 +22,18 @@
   },
   "homepage": "https://gitlab.com/push.rocks/smartstream#readme",
   "devDependencies": {
-    "@git.zone/tsbuild": "^2.1.66",
+    "@git.zone/tsbuild": "^2.1.72",
     "@git.zone/tsrun": "^1.2.44",
-    "@git.zone/tstest": "^1.0.84",
+    "@git.zone/tstest": "^1.0.88",
-    "@push.rocks/smartfile": "^11.0.0",
+    "@push.rocks/smartfile": "^11.0.4",
-    "@push.rocks/tapbundle": "^5.0.15",
+    "@push.rocks/tapbundle": "^5.0.17",
-    "@types/node": "^20.9.0"
+    "@types/node": "^20.11.28"
   },
   "dependencies": {
-    "@push.rocks/lik": "^6.0.12",
+    "@push.rocks/lik": "^6.0.14",
     "@push.rocks/smartpromise": "^4.0.3",
-    "@push.rocks/smartrx": "^3.0.7"
+    "@push.rocks/smartrx": "^3.0.7",
+    "@push.rocks/webstream": "^1.0.8"
   },
   "browserslist": [
     "last 1 chrome versions"
@@ -48,5 +49,24 @@
     "cli.js",
     "npmextra.json",
     "readme.md"
+  ],
+  "keywords": [
+    "stream",
+    "node.js",
+    "typescript",
+    "stream manipulation",
+    "data processing",
+    "pipeline",
+    "async transformation",
+    "event handling",
+    "backpressure",
+    "readable stream",
+    "writable stream",
+    "duplex stream",
+    "transform stream",
+    "file streaming",
+    "buffer",
+    "stream utilities",
+    "esm"
   ]
 }

readme.hints.md

@@ -0,0 +1 @@
+ - make sure to respect backpressure handling.

readme.md

@@ -1,54 +1,375 @@
-# @pushrocks/smartstream
+```markdown
-simplifies access to node streams
+# @push.rocks/smartstream
+A TypeScript library to simplify the creation and manipulation of Node.js streams, providing utilities for transform, duplex, and readable/writable stream handling while managing backpressure effectively.
 
-## Availabililty and Links
+## Install
-* [npmjs.org (npm package)](https://www.npmjs.com/package/@pushrocks/smartstream)
+To install `@push.rocks/smartstream`, you can use npm or yarn as follows:
-* [gitlab.com (source)](https://gitlab.com/pushrocks/smartstream)
-* [github.com (source mirror)](https://github.com/pushrocks/smartstream)
-* [docs (typedoc)](https://pushrocks.gitlab.io/smartstream/)
 
-## Status for master
+```bash
+npm install @push.rocks/smartstream --save
+# OR
+yarn add @push.rocks/smartstream
+```
 
-Status Category | Status Badge
+This will add `@push.rocks/smartstream` to your project's dependencies.
--- | --
-GitLab Pipelines | [![pipeline status](https://gitlab.com/pushrocks/smartstream/badges/master/pipeline.svg)](https://lossless.cloud)
-GitLab Pipline Test Coverage | [![coverage report](https://gitlab.com/pushrocks/smartstream/badges/master/coverage.svg)](https://lossless.cloud)
-npm | [![npm downloads per month](https://badgen.net/npm/dy/@pushrocks/smartstream)](https://lossless.cloud)
-Snyk | [![Known Vulnerabilities](https://badgen.net/snyk/pushrocks/smartstream)](https://lossless.cloud)
-TypeScript Support | [![TypeScript](https://badgen.net/badge/TypeScript/>=%203.x/blue?icon=typescript)](https://lossless.cloud)
-node Support | [![node](https://img.shields.io/badge/node->=%2010.x.x-blue.svg)](https://nodejs.org/dist/latest-v10.x/docs/api/)
-Code Style | [![Code Style](https://badgen.net/badge/style/prettier/purple)](https://lossless.cloud)
-PackagePhobia (total standalone install weight) | [![PackagePhobia](https://badgen.net/packagephobia/install/@pushrocks/smartstream)](https://lossless.cloud)
-PackagePhobia (package size on registry) | [![PackagePhobia](https://badgen.net/packagephobia/publish/@pushrocks/smartstream)](https://lossless.cloud)
-BundlePhobia (total size when bundled) | [![BundlePhobia](https://badgen.net/bundlephobia/minzip/@pushrocks/smartstream)](https://lossless.cloud)
-Platform support | [![Supports Windows 10](https://badgen.net/badge/supports%20Windows%2010/yes/green?icon=windows)](https://lossless.cloud) [![Supports Mac OS X](https://badgen.net/badge/supports%20Mac%20OS%20X/yes/green?icon=apple)](https://lossless.cloud)
 
 ## Usage
 
-Use TypeScript for best in class instellisense.
+The `@push.rocks/smartstream` module is designed to simplify working with Node.js streams by providing a set of utilities for creating and manipulating streams. This module makes extensive use of TypeScript for improved code quality, readability, and maintenance. ESM syntax is utilized throughout the examples.
+
+### Importing the Module
+
+Start by importing the module into your TypeScript file:
 
 ```typescript
-import { Smartstream } from 'smartstream'
+import * as smartstream from '@push.rocks/smartstream';
-import * as gUglify from 'gulp-uglify'
-
-let mySmartstream = new Smartstream([
-    gulp.src(['./file1.js','./file2.js']),
-    gUglify(),
-    gulp.dest('./some/output/path')
-])
-
-mySmartstream.onError((err) => { /* handle error */ }) // handles all errors in stream
-myStream.onCustomEvent('myeventname', (args...) => { /* Do something */ }) // emit an custom event anywhere in your stream
-mySmartstream.run().then(() => {/* do something when stream is finished */})
 ```
 
-## Contribution
+For a more specific import, you may do the following:
 
-We are always happy for code contributions. If you are not the code contributing type that is ok. Still, maintaining Open Source repositories takes considerable time and thought. If you like the quality of what we do and our modules are useful to you we would appreciate a little monthly contribution: You can [contribute one time](https://lossless.link/contribute-onetime) or [contribute monthly](https://lossless.link/contribute). :)
+```typescript
+import { SmartDuplex, StreamWrapper, StreamIntake, createTransformFunction, createPassThrough } from '@push.rocks/smartstream';
+```
 
-For further information read the linked docs at the top of this readme.
+### Creating Basic Transform Streams
 
-> MIT licensed | **©** [Lossless GmbH](https://lossless.gmbh)
+The module provides utilities for creating transform streams. For example, to create a transform stream that modifies chunks of data, you can use the `createTransformFunction` utility:
-| By using this npm module you agree to our [privacy policy](https://lossless.gmbH/privacy)
 
-[![repo-footer](https://lossless.gitlab.io/publicrelations/repofooter.svg)](https://maintainedby.lossless.com)
+```typescript
+import { createTransformFunction } from '@push.rocks/smartstream';
+
+const upperCaseTransform = createTransformFunction<string, string>(async (chunk) => {
+  return chunk.toUpperCase();
+});
+
+// Usage with pipe
+readableStream
+  .pipe(upperCaseTransform)
+  .pipe(writableStream);
+```
+
+### Handling Backpressure with SmartDuplex
+
+`SmartDuplex` is a powerful part of the `smartstream` module designed to handle backpressure effectively. Here's an example of how to create a `SmartDuplex` stream that processes data and respects the consumer's pace:
+
+```typescript
+import { SmartDuplex } from '@push.rocks/smartstream';
+
+const processDataDuplex = new SmartDuplex({
+  async writeFunction(chunk, { push }) {
+    const processedChunk = await processChunk(chunk); // Assume this is a defined asynchronous function
+    push(processedChunk);
+  }
+});
+
+sourceStream.pipe(processDataDuplex).pipe(destinationStream);
+```
+
+### Combining Multiple Streams
+
+`Smartstream` facilitates easy combining of multiple streams into a single pipeline, handling errors and cleanup automatically. Here's how you can combine multiple streams:
+
+```typescript
+import { StreamWrapper } from '@push.rocks/smartstream';
+
+const combinedStream = new StreamWrapper([
+  readStream,       // Source stream
+  transformStream1, // Transformation
+  transformStream2, // Another transformation
+  writeStream       // Destination stream
+]);
+
+combinedStream.run()
+  .then(() => console.log('Processing completed.'))
+  .catch(err => console.error('An error occurred:', err));
+```
+
+### Working with StreamIntake
+
+`StreamIntake` allows for more dynamic control of the reading process, facilitating scenarios where data is not continuously available:
+
+```typescript
+import { StreamIntake } from '@push.rocks/smartstream';
+
+const streamIntake = new StreamIntake<string>();
+
+// Dynamically push data into the intake
+streamIntake.pushData('Hello, World!');
+streamIntake.pushData('Another message');
+
+// Signal end when no more data is to be pushed
+streamIntake.signalEnd();
+```
+
+### Real-world Scenario: Processing Large Files
+
+Consider a scenario where you need to process a large CSV file, transform the data row-by-row, and then write the results to a database or another file. With `smartstream`, you could create a pipe that reads the CSV, processes each row, and handles backpressure, ensuring efficient use of resources.
+
+```typescript
+import { SmartDuplex, createTransformFunction } from '@push.rocks/smartstream';
+import fs from 'fs';
+import csvParser from 'csv-parser';
+
+const csvReadTransform = createTransformFunction<any, any>(async (row) => {
+  // Process row
+  return processedRow;
+});
+
+fs.createReadStream('path/to/largeFile.csv')
+  .pipe(csvParser())
+  .pipe(csvReadTransform)
+  .pipe(new SmartDuplex({
+    async writeFunction(chunk, { push }) {
+      await writeToDatabase(chunk); // Assume this writes to a database
+    }
+  }))
+  .on('finish', () => console.log('File processed successfully.'));
+```
+
+This example demonstrates reading a large CSV file, transforming each row with `createTransformFunction`, and using a `SmartDuplex` to manage the processed data flow efficiently, ensuring no data is lost due to backpressure issues.
+
+### Advanced Use Case: Backpressure Handling
+
+Effective backpressure handling is crucial when working with streams to avoid overwhelming the downstream consumers. Here’s a comprehensive example that demonstrates handling backpressure in a pipeline with multiple `SmartDuplex` instances:
+
+```typescript
+import { SmartDuplex } from '@push.rocks/smartstream';
+
+// Define the first SmartDuplex, which writes data slowly to simulate backpressure
+const slowProcessingStream = new SmartDuplex({
+  name: 'SlowProcessor',
+  objectMode: true,
+  writeFunction: async (chunk, { push }) => {
+    await new Promise(resolve => setTimeout(resolve, 100)); // Simulated delay
+    console.log('Processed chunk:', chunk);
+    push(chunk);
+  }
+});
+
+// Define the second SmartDuplex as a fast processor
+const fastProcessingStream = new SmartDuplex({
+  name: 'FastProcessor',
+  objectMode: true,
+  writeFunction: async (chunk, { push }) => {
+    console.log('Fast processing chunk:', chunk);
+    push(chunk);
+  }
+});
+
+// Create a StreamIntake to dynamically handle incoming data
+const streamIntake = new StreamIntake<string>();
+
+// Chain the streams together and handle the backpressure scenario
+streamIntake
+  .pipe(fastProcessingStream)
+  .pipe(slowProcessingStream)
+  .pipe(createPassThrough()) // Use Pass-Through to provide intermediary handling
+  .on('data', data => console.log('Final output:', data))
+  .on('error', error => console.error('Stream encountered an error:', error));
+
+// Simulate data pushing with intervals to observe backpressure handling
+let counter = 0;
+const interval = setInterval(() => {
+  if (counter >= 10) {
+    streamIntake.signalEnd();
+    clearInterval(interval);
+  } else {
+    streamIntake.pushData(`Chunk ${counter}`);
+    counter++;
+  }
+}, 50);
+```
+
+In this advanced use case, a `SlowProcessor` and `FastProcessor` are created using `SmartDuplex`, simulating a situation where one stream is slower than another. The `StreamIntake` dynamically handles incoming chunks of data and the intermediary Pass-Through handles any potential interruptions.
+
+### Transform Streams in Parallel
+
+For scenarios where you need to process data in parallel:
+
+```typescript
+import { SmartDuplex, createTransformFunction } from '@push.rocks/smartstream';
+
+const parallelTransform = createTransformFunction<any, any>(async (chunk) => {
+  // Parallel Processing
+  const results = await Promise.all(chunk.map(async item => await processItem(item)));
+  return results;
+});
+
+const streamIntake = new StreamIntake<any[]>();
+
+streamIntake
+  .pipe(parallelTransform)
+  .pipe(new SmartDuplex({
+    async writeFunction(chunk, { push }) {
+      console.log('Processed parallel chunk:', chunk);
+      push(chunk);
+    }
+  }))
+  .on('finish', () => console.log('Parallel processing completed.'));
+
+// Simulate data pushing
+streamIntake.pushData([1, 2, 3, 4]);
+streamIntake.pushData([5, 6, 7, 8]);
+streamIntake.signalEnd();
+```
+
+### Error Handling in Stream Pipelines
+
+Error handling is an essential part of working with streams. The `StreamWrapper` assists in combining multiple streams while managing errors seamlessly:
+
+```typescript
+import { StreamWrapper } from '@push.rocks/smartstream';
+
+const faultyStream = new SmartDuplex({
+  async writeFunction(chunk, { push }) {
+    if (chunk === 'bad data') {
+      throw new Error('Faulty data encountered');
+    }
+    push(chunk);
+  }
+});
+
+const readStream = new StreamIntake<string>();
+const writeStream = new SmartDuplex({
+  async writeFunction(chunk) {
+    console.log('Written chunk:', chunk);
+  }
+});
+
+const combinedStream = new StreamWrapper([readStream, faultyStream, writeStream]);
+
+combinedStream.run()
+  .then(() => console.log('Stream processing completed.'))
+  .catch(err => console.error('Stream error:', err.message));
+
+// Push Data
+readStream.pushData('good data');
+readStream.pushData('bad data');  // This will throw an error
+readStream.pushData('more good data');
+readStream.signalEnd();
+```
+
+### Testing Streams
+
+Here's an example test case using the `tap` testing framework to verify the integrity of the `SmartDuplex` from a buffer:
+
+```typescript
+import { expect, tap } from '@push.rocks/tapbundle';
+import { SmartDuplex } from '@push.rocks/smartstream';
+
+tap.test('should create a SmartStream from a Buffer', async () => {
+  const bufferData = Buffer.from('This is a test buffer');
+  const smartStream = SmartDuplex.fromBuffer(bufferData, {});
+  
+  let receivedData = Buffer.alloc(0);
+  
+  return new Promise<void>((resolve) => {
+    smartStream.on('data', (chunk: Buffer) => {
+      receivedData = Buffer.concat([receivedData, chunk]);
+    });
+
+    smartStream.on('end', () => {
+      expect(receivedData.toString()).toEqual(bufferData.toString());
+      resolve();
+    });
+  });
+});
+
+tap.start();
+```
+
+### Working with Files and Buffers
+
+You can easily stream files and buffers with `smartstream`. Here’s a test illustrating reading and writing with file streams using `smartfile` combined with `smartstream` utilities:
+
+```typescript
+import { tap } from '@push.rocks/tapbundle';
+import * as smartfile from '@push.rocks/smartfile';
+import { SmartDuplex, StreamWrapper } from '@push.rocks/smartstream';
+
+tap.test('should handle file read and write streams', async () => {
+  const readStream = smartfile.fsStream.createReadStream('./test/assets/readabletext.txt');
+  const writeStream = smartfile.fsStream.createWriteStream('./test/assets/writabletext.txt');
+
+  const transformStream = new SmartDuplex({
+    async writeFunction(chunk, { push }) {
+      const transformedChunk = chunk.toString().toUpperCase();
+      push(transformedChunk);
+    }
+  });
+
+  const streamWrapper = new StreamWrapper([readStream, transformStream, writeStream]);
+
+  await streamWrapper.run();
+
+  const outputContent = await smartfile.fs.promises.readFile('./test/assets/writabletext.txt', 'utf-8');
+  console.log('Output Content:', outputContent);
+});
+
+tap.start();
+```
+
+### Modular and Scoped Transformations
+
+Creating modular and scoped transformations is straightforward with `SmartDuplex`:
+
+```typescript
+import { SmartDuplex } from '@push.rocks/smartstream';
+
+type DataChunk = {
+  id: number;
+  data: string;
+};
+
+const transformationStream1 = new SmartDuplex<DataChunk, DataChunk>({
+  async writeFunction(chunk, { push }) {
+    chunk.data = chunk.data.toUpperCase();
+    push(chunk);
+  }
+})
+
+const transformationStream2 = new SmartDuplex<DataChunk, DataChunk>({
+  async writeFunction(chunk, { push }) {
+    chunk.data = `${chunk.data} processed with transformation 2`;
+    push(chunk);
+  }
+});
+
+const initialData: DataChunk[] = [
+  { id: 1, data: 'first' },
+  { id: 2, data: 'second' }
+];
+
+const intakeStream = new StreamIntake<DataChunk>();
+
+intakeStream
+  .pipe(transformationStream1)
+  .pipe(transformationStream2)
+  .on('data', data => console.log('Transformed Data:', data));
+
+initialData.forEach(item => intakeStream.pushData(item));
+intakeStream.signalEnd();
+```
+
+By leveraging `SmartDuplex`, `StreamWrapper`, and `StreamIntake`, you can streamline and enhance your data transformation pipelines in Node.js with a clear, efficient, and backpressure-friendly approach.
+```
+
+
+## License and Legal Information
+
+This repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository. 
+
+**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.
+
+### Trademarks
+
+This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.
+
+### Company Information
+
+Task Venture Capital GmbH  
+Registered at District court Bremen HRB 35230 HB, Germany
+
+For any legal inquiries or if you require further information, please contact us via email at hello@task.vc.
+
+By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.

test/test.backpressure.ts

@@ -7,7 +7,6 @@ tap.test('should run backpressure test', async (toolsArg) => {
     const stream1 = new SmartDuplex({
       name: 'stream1',
       objectMode: true,
-      handleBackpressure: true,
       writeFunction: async (chunk, tools) => {
         await new Promise((resolve) => setTimeout(resolve, 10)); // Slow processing
         console.log(`processed chunk ${chunk} in stream 1`);
@@ -17,19 +16,18 @@ tap.test('should run backpressure test', async (toolsArg) => {
     const stream2 = new SmartDuplex({
       name: 'stream2',
       objectMode: true,
-      handleBackpressure: true,
       writeFunction: async (chunk, tools) => {
         await new Promise((resolve) => setTimeout(resolve, 20)); // Slow processing
         console.log(`processed chunk ${chunk} in stream 2`);
-        return chunk;
+        await tools.push(chunk);
+        // return chunk, optionally return ;
       },
     }); // This stream processes data more slowly
     const stream3 = new SmartDuplex({
       objectMode: true,
       name: 'stream3',
-      handleBackpressure: true,
       writeFunction: async (chunk, tools) => {
-        await new Promise((resolve) => setTimeout(resolve, 100)); // Slow processing
+        await new Promise((resolve) => setTimeout(resolve, 200)); // Slow processing
         console.log(`processed chunk ${chunk} in stream 3`);
       },
     });

test/test.smartstream.ts

@@ -5,9 +5,7 @@ import * as fs from 'fs';
 
 tap.test('should create a SmartStream from a Buffer', async () => {
   const bufferData = Buffer.from('This is a test buffer');
-  const smartStream = SmartDuplex.fromBuffer(bufferData, {
+  const smartStream = SmartDuplex.fromBuffer(bufferData, {});
-    handleBackpressure: false,
-  });
   
   let receivedData = Buffer.alloc(0);
   

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstream',
-  version: '3.0.22',
+  version: '3.0.36',
-  description: 'simplifies access to node streams'
+  description: 'A library to simplify the creation and manipulation of Node.js streams, providing utilities for handling transform, duplex, and readable/writable streams effectively in TypeScript.'
 }

ts/index.ts

@@ -1,6 +1,8 @@
-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'
+export * from './smartstream.functions.js';
+
+import * as plugins from './smartstream.plugins.js';
+export const webstream = plugins.webstream;

ts/smartstream.classes.passthrough.ts

@@ -1,21 +0,0 @@
-import * as plugins from './smartstream.plugins.js';
-
-export class PassThrough extends plugins.stream.Duplex {
-  constructor(options?: plugins.stream.DuplexOptions) {
-    super(options);
-  }
-
-  _read(size: number): void {
-    // No-op: Data written will be automatically available for reading.
-  }
-
-  _write(chunk: any, encoding: BufferEncoding, callback: (error?: Error | null) => void): void {
-    if (this.push(chunk, encoding)) {
-      callback();
-    } else {
-      this.once('drain', () => {
-        callback();
-      });
-    }
-  }
-}

ts/smartstream.classes.smartduplex.ts

@@ -3,7 +3,7 @@ import { Duplex, type DuplexOptions } from 'stream';
 
 export interface IStreamTools {
   truncate: () => void;
-  push: (pipeObject: any) => Promise<void>;
+  push: (pipeObject: any) => Promise<boolean>;
 }
 
 export interface IStreamWriteFunction<T, rT> {
@@ -15,13 +15,30 @@ export interface IStreamFinalFunction<rT> {
 }
 
 export interface ISmartDuplexOptions<TInput, TOutput> extends DuplexOptions {
+  /**
+   * wether to print debug logs
+   */
   debug?: boolean;
+  /**
+   * the name of the stream
+   */
   name?: string;
-  handleBackpressure?: boolean;
+  /**
+   * a function that is being called to read more stuff from whereever to be processed by the stream
+   * @returns
+   */
   readFunction?: () => Promise<void>;
+
+  /**
+   * the write function is called for every chunk that is being written to the stream
+   * it can push or return chunks (but does not have to) to be written to the readable side of the stream
+   */
   writeFunction?: IStreamWriteFunction<TInput, TOutput>;
+  
+  /**
+   * a final function that is run at the end of the stream 
+   */
   finalFunction?: IStreamFinalFunction<TOutput>;
-  // Add other custom options if necessary
 }
 
 export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
@@ -36,7 +53,7 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
   }
 
   // INSTANCE
-  private backpressuredArray = new plugins.lik.BackpressuredArray<TOutput>();
+  private backpressuredArray: plugins.lik.BackpressuredArray<TOutput>;
   public options: ISmartDuplexOptions<TInput, TOutput>;
   private observableSubscription?: plugins.smartrx.rxjs.Subscription;
   private debugLog(messageArg: string) {
@@ -46,8 +63,11 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
   }
 
   constructor(optionsArg?: ISmartDuplexOptions<TInput, TOutput>) {
-    super(optionsArg);
+    super(Object.assign({
+      highWaterMark: 1,
+    }, optionsArg));
     this.options = optionsArg;
+    this.backpressuredArray = new plugins.lik.BackpressuredArray<TOutput>(this.options.highWaterMark || 1)
   }
 
   public async _read(size: number): Promise<void> {
@@ -60,11 +80,19 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
     let canPushMore = true; 
     while(this.backpressuredArray.data.length > 0 && canPushMore) {
       const nextChunk = this.backpressuredArray.shift();
-      if (nextChunk) {
       canPushMore = this.push(nextChunk);
     }
   }
+
+  public async backpressuredPush (pushArg: TOutput) {
+    const canPushMore = this.backpressuredArray.push(pushArg);
+    if (!canPushMore) {
+      this.debugLog(`${this.options.name}: cannot push more`);
+      await this.backpressuredArray.waitForSpace();
+      this.debugLog(`${this.options.name}: can push more again`);
     }
+    return canPushMore;
+  };
 
   private asyncWritePromiseObjectmap = new plugins.lik.ObjectMap<Promise<any>>();
   // Ensure the _write method types the chunk as TInput and encodes TOutput
@@ -81,13 +109,8 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
         callback();
       },
       push: async (pushArg: TOutput) => {
-        const canPushMore = this.backpressuredArray.push(pushArg);
+        return await this.backpressuredPush(pushArg);
-        if (!canPushMore) {
-          this.debugLog(`${this.options.name}: cannot push more`);
-          await this.backpressuredArray.waitForSpace();
-          this.debugLog(`${this.options.name}: can push more again`);
       }
-      },
     };
 
     try {
@@ -116,22 +139,22 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
       const tools: IStreamTools = {
         truncate: () => callback(),
         push: async (pipeObject) => {
-          this.push(pipeObject);
+          return this.backpressuredArray.push(pipeObject);
         },
       };
 
       try {
         const finalChunk = await this.options.finalFunction(tools);
         if (finalChunk) {
-          this.push(finalChunk);
+          this.backpressuredArray.push(finalChunk);
         }
       } catch (err) {
-        this.push(null);
+        this.backpressuredArray.push(null);
         callback(err);
         return;
       }
     }
-    this.push(null);
+    this.backpressuredArray.push(null);
     callback();
   }
 }

ts/smartstream.functions.ts

@@ -19,3 +19,12 @@ export function createTransformFunction<TInput, TOutput>(
 
   return smartDuplexStream;
 }
+
+export const createPassThrough = () => {
+  return new SmartDuplex({
+    objectMode: true,
+    writeFunction: async (chunkArg, toolsArg) => {
+      return chunkArg;
+    }
+  })
+}

ts/smartstream.plugins.ts

@@ -7,6 +7,7 @@ export { stream };
 import * as lik from '@push.rocks/lik';
 import * as smartpromise from '@push.rocks/smartpromise';
 import * as smartrx from '@push.rocks/smartrx';
+import * as webstream from '@push.rocks/webstream';
 
-export { lik, smartpromise, smartrx };
+export { lik, smartpromise, smartrx, webstream };