Add back export of keys (#3113)

* Add back export of keys * Add changeset * Update .changeset/kind-waves-provide.md Co-authored-by: Mateusz Burzyński <[email protected]>
statelyai · Mar 4, 2022 · 144131b · 144131b
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diff --git a/.changeset/kind-waves-provide.md b/.changeset/kind-waves-provide.md
@@ -0,0 +1,5 @@
+---
+'xstate': patch
+---
+
+The `keys()` utility function export, which was removed in [#3089](https://github.com/statelyai/xstate/issues/3089), is now added back, as older versions of XState libraries may depend on it still. See [#3106](https://github.com/statelyai/xstate/issues/3106) for more details.
diff --git a/packages/core/src/utils.ts b/packages/core/src/utils.ts
@@ -36,6 +36,10 @@ import { State } from './State';
 import { Actor } from './Actor';
 import { AnyStateMachine } from '.';
 
+export function keys<T extends object>(value: T): Array<keyof T & string> {
+  return Object.keys(value) as Array<keyof T & string>;
+}
+
 export function matchesState(
   parentStateId: StateValue,
   childStateId: StateValue,