feat(parallel-transform): allow passing of default optinos to .create

Author: Caerostris

README.md

@@ -49,10 +49,11 @@ They may implement `_parallelFlush`, although this is not required.
 
 ### API
 
-**ParallelTransform.create(transform, flush = function(done) { done(); })**
+**ParallelTransform.create(transform, flush = function(done) { done(); }, defaultOptions = {})**
 
 * `transform` `<Function>` The \_transform function of the stream. See below for more details
 * `flush` `<Function>` The \_flush function of the stream. See below for more details
+* `defaultOptions` `<Object>` Default options for the class constructor
 
 ### API for extending ParallelTransform
 

src/parallel-transform.js

@@ -38,8 +38,12 @@ export default class ParallelTransform extends stream.Transform {
     _ondrain.set(this, null);
   }
 
-  static create(transform, flush = done => done()) {
+  static create(transform, flush = done => done(), defaultOptions = {}) {
     class Transform extends ParallelTransform {
+      constructor(options) {
+        super(Object.assign({}, defaultOptions, options));
+      }
+
       _parallelTransform = transform;
       _parallelFlush = flush;
     }