feat(core): Deno.core.setNextTickCallback (#12771)

This commit adds several new "Deno.core" bindings:
* "setNextTickCallback"
* "hasScheduledTick"
* "setHasScheduledTick"
* "runMicrotasks"
Additionally it changes "Deno.core.setMacrotaskCallback" to
allow registering multiple callbacks. All these changes were necessary
to polyfill "process.nextTick" in Node compat layer.

Co-authored-by: Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 21 insertions, 0 deletions

diff --git a/core/lib.deno_core.d.ts b/core/lib.deno_core.d.ts
index 4a5d6433b..f33f6164a 100644
--- a/core/lib.deno_core.d.ts
+++ b/core/lib.deno_core.d.ts
@@ -86,5 +86,26 @@ declare namespace Deno {
     function setWasmStreamingCallback(
       cb: (source: any, rid: number) => void,
     ): void;
+
+    /**
+     * Set a callback that will be called after resolving ops and before resolving
+     * macrotasks.
+     */
+    function setNextTickCallback(
+      cb: () => void,
+    ): void;
+
+    /** Check if there's a scheduled "next tick". */
+    function hasNextTickScheduled(): bool;
+
+    /** Set a value telling the runtime if there are "next ticks" scheduled */
+    function setHasNextTickScheduled(value: bool): void;
+
+    /**
+     * Set a callback that will be called after resolving ops and "next ticks".
+     */
+    function setMacrotaskCallback(
+      cb: () => bool,
+    ): void;
   }
 }