feat(applyasync): add applyAsync function

Author: djcsdy

index.test.ts

@@ -1,5 +1,5 @@
 import test from "ava";
-import {allAsync, sequenceAsync} from "./index";
+import {allAsync, applyAsync, sequenceAsync} from "./index";
 
 test("allAsync", async t => {
     const a = Promise.resolve(1 as const);
@@ -52,3 +52,8 @@ test("sequenceAsync", async t => {
 
     t.deepEqual(a, [1, 2]);
 });
+
+test("applyAsync", async t => {
+    const f = Promise.resolve((a: number) => a + 1);
+    t.is(await applyAsync(f)(2), 3);
+});

index.ts

@@ -29,3 +29,9 @@ export async function sequenceAsync<T extends Iterable<() => unknown>>(
     }
     return result as SequenceAsync<T>;
 }
+
+export function applyAsync<TA, TResult>(
+    promise: Promise<(a: TA) => TResult>
+): (a: TA) => Promise<TResult> {
+    return async a => promise.then(f => f(a));
+}