fix(smartduplex): now has a .getWebStreams method, that exposes a web streams compatible API

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/smartstream',
-  version: '3.0.39',
+  version: '3.0.40',
   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/smartstream.classes.smartduplex.ts

@@ -157,4 +157,53 @@ export class SmartDuplex<TInput = any, TOutput = any> extends Duplex {
     this.backpressuredArray.push(null);
     callback();
   }
+
+  public getWebStreams(): { readable: ReadableStream, writable: WritableStream } {
+    const duplex = this;
+    const readable = new ReadableStream({
+      start(controller) {
+        duplex.on('readable', () => {
+          let chunk;
+          while (null !== (chunk = duplex.read())) {
+            controller.enqueue(chunk);
+          }
+        });
+  
+        duplex.on('end', () => {
+          controller.close();
+        });
+      },
+      cancel(reason) {
+        duplex.destroy(new Error(reason));
+      }
+    });
+  
+    const writable = new WritableStream({
+      write(chunk) {
+        return new Promise<void>((resolve, reject) => {
+          const isBackpressured = !duplex.write(chunk, (error) => {
+            if (error) {
+              reject(error);
+            } else {
+              resolve();
+            }
+          });
+  
+          if (isBackpressured) {
+            duplex.once('drain', resolve);
+          }
+        });
+      },
+      close() {
+        return new Promise<void>((resolve, reject) => {
+          duplex.end(resolve);
+        });
+      },
+      abort(reason) {
+        duplex.destroy(new Error(reason));
+      }
+    });
+  
+    return { readable, writable };
+  }
 }