chore(stackflow/core): Type inference friendly divideBy (#557)

Author: ENvironmentSet

.changeset/four-colts-nail.md

@@ -0,0 +1,5 @@
+---
+"@stackflow/core": patch
+---
+
+Made `divideBy` to be friendly to type inference.

core/src/makeCoreStore.ts

@@ -61,7 +61,7 @@ export function makeCoreStore(options: MakeCoreStoreOptions): CoreStore {
         initialEvents,
         initialContext: options.initialContext ?? {},
       }) ?? initialEvents,
-    initialPushedEventsByOption as (PushedEvent | StepPushedEvent)[],
+    initialPushedEventsByOption,
   );
 
   const isInitialActivityIgnored =

core/src/utils/divideBy.ts

@@ -1,8 +1,8 @@
-export const divideBy = <T>(
+export const divideBy = <T, U extends T>(
   arr: T[],
-  predicate: (t: T) => boolean,
-): [T[], T[]] => {
-  const satisfied: T[] = [];
+  predicate: (t: T) => t is U,
+): [U[], T[]] => {
+  const satisfied: U[] = [];
   const unsatisfied: T[] = [];
 
   arr.forEach((element) => {