Fix typing issue and properly export Bin

Author: Sytten

package.json

@@ -1,6 +1,6 @@
 {
     "name": "@graphmetrics/sketches-js",
-    "version": "0.2.0",
+    "version": "0.2.1",
     "description": "TypeScript implementation of DDSketch, a distributed quantile sketch algorithm ",
     "license": "Apache-2.0",
     "repository": "https://github.com/GraphMetrics/sketches-js",

src/ddsketch/DDSketch.ts

@@ -5,7 +5,7 @@
  * Copyright 2021 GraphMetrics for modifications
  */
 
-import { DenseStore } from './store';
+import { Bin, DenseStore } from './store';
 import { Mapping, LogarithmicMapping } from './mapping';
 
 const DEFAULT_RELATIVE_ACCURACY = 0.01;
@@ -142,7 +142,7 @@ class BaseDDSketch {
     /*
      * Return an iterator on the bins
      */
-    bins() {
+    bins(): IterableIterator<Bin> {
         return this.store.iterate();
     }
 

src/ddsketch/store/index.ts

@@ -5,7 +5,7 @@
  * Copyright 2021 GraphMetrics for modifications
  */
 
-export { Store } from './types';
+export { Bin, Store } from './types';
 export { DenseStore } from './DenseStore';
 export { CollapsingLowestDenseStore } from './CollapsingLowestDenseStore';
 export { CollapsingHighestDenseStore } from './CollapsingHighestDenseStore';