Added timers/promises. Resolves #21

Author: TheSpyder

.changes/unreleased/Added-20231211-034512.yaml

@@ -0,0 +1,5 @@
+kind: Added
+body: Timers.Promises from NodeJS 16
+time: 2023-12-11T03:45:12.916076+11:00
+custom:
+  Github Issue: "21"

lib/js/src/Timers.bs.js

@@ -21,3 +21,13 @@ external setInterval: (unit => unit, int) => Timeout.t = "setInterval"
 @val external clearImmediate: Immediate.t => unit = "clearImmediate"
 @val external clearTimeout: Timeout.t => unit = "clearTimeout"
 @val external clearInterval: Timeout.t => unit = "clearInterval"
+
+module Promises = {
+  @module("node:timers/promises")
+  external setTimeout: int => Js.Promise.t<unit> = "setTimeout"
+  @module("node:timers/promises")
+  external setImmediate: 'a => Js.Promise.t<'a> = "setImmediate"
+  // setInterval is not a promise, it's an async iterator
+  // @module("node:timers/promises")
+  // external setInterval: (int, 'a) => Js.Promise.t<'a> = "setTimeout"
+}

lib/js/test/atomic/Timers.test.bs.js

@@ -0,0 +1,12 @@
+open Zora
+
+zora("Timers (promises)", async t => {
+  t->test("setTimeout", async t => {
+    let () = await Timers.Promises.setTimeout(100)
+    t->ok(true, "")
+  })
+  t->test("setImmediate", async t => {
+    let yes = await Timers.Promises.setImmediate("yes")
+    t->equal(yes, "yes", "")
+  })
+})