fix(core): update

ts/index.ts

@@ -1,3 +1,10 @@
-import * as plugins from './smartarray.plugins';
-
-export let standardExport = 'Hi there! :) This is an exported string';
+export const filter = async<T>(arrayArg: T[], filterFunction: (itemArg: T) => Promise<boolean>): Promise<T[]> => {
+  const returnArray: T[] = [];
+  for (const itemArg of arrayArg) {
+    const filterResult = await filterFunction(itemArg);
+    if (filterResult) {
+      returnArray.push(itemArg);
+    }
+  }
+  return returnArray;
+}