fix(Symbol.observable): make observable declaration readonly (#3697) (#…

…3773)
ReactiveX · Jun 1, 2018 · e1c203f · e1c203f
1 parent 0b56964
commit e1c203f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/internal/symbol/observable.ts b/src/internal/symbol/observable.ts
@@ -5,7 +5,7 @@ import { root } from '../util/root';
   however, we are no longer polyfilling Symbol.observable */
 declare global {
   interface SymbolConstructor {
-    observable: symbol;
+    readonly observable: symbol;
   }
 }