narrowed typing for stream data

Author: webKrafter

package.json

@@ -115,7 +115,7 @@
     "test:watch": "eslint --fix && jest --updateSnapshot --watchAll"
   },
   "types": "dist/index.d.ts",
-  "version": "7.0.5",
+  "version": "7.0.6",
   "dependencies": {
     "@webkrafters/eagleeye": "^1.0.6"
   }

src/main/index.tsx

@@ -96,7 +96,7 @@ export class ObservableContext<T extends State> {
 	 */
 	get useStream() {
 		const stream = this.consumer.stream;
-		return <S extends SelectorMap>( selectorMap? : S ) => {
+		return <const S extends SelectorMap>( selectorMap? : S ) => {
 			const [ channel ] = useState(() => stream( selectorMap ));
 			const [ store, setStore ] = useState(() => ({
 				data: channel.data,
@@ -136,7 +136,7 @@ export class ObservableContext<T extends State> {
 	 * @param [selectorMap] - Key:value pairs where `key` => arbitrary key given to a Store.data property holding a state slice and `value` => property path to a state slice used by this component: see examples below. May add a mapping for a certain arbitrary key='state' and value='@@STATE' to indicate a desire to obtain the entire state object and assign to a `state` property of Store.data. A change in any of the referenced properties results in this component render. When using '@@STATE', note that any change within the state object will result in this component render.
 	 * @see {useStream} for selectorMap sample
 	 */
-	private _connect = <S extends SelectorMap>( selectorMap? : S ) => {
+	private _connect = <const S extends SelectorMap>( selectorMap? : S ) => {
 		const ctx = this;
 		function connector<P extends ExtractInjectedProps<T, S>>(
 			WrappedComponent : ElementType<ConnectProps<P, T, S>>