fix(whatInput): Type event listeners (microsoft#20024)

* fix(whatInput): Type event listeners Adds the `WhatInputEvents` to type event listeners with the events that can be used by what-input * changelog entry
mlp73 · Jan 17, 2022 · 9d4e9b8 · 9d4e9b8
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diff --git a/packages/fluentui/CHANGELOG.md b/packages/fluentui/CHANGELOG.md
@@ -20,6 +20,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ### Fixes
 - `Popup` should not dismiss when its iframe content is focused @ling1726 ([#19955](https://github.com/microsoft/fluentui/pull/19955))
+- `whatInput` Add typings to what input event listeners @ling1726 ([#20024](https://github.com/microsoft/fluentui/pull/20024))
 
 
 <!--------------------------------[ v0.59.0 ]------------------------------- -->

diff --git a/packages/fluentui/react-northstar/src/utils/whatInput.ts b/packages/fluentui/react-northstar/src/utils/whatInput.ts
@@ -73,6 +73,8 @@ const setUp = () => {
   doUpdate(window.document);
 };
 
+type WhatInputEvents = MouseEvent | TouchEvent | KeyboardEvent;
+
 /*
  * events
  */
@@ -107,7 +109,7 @@ const addListeners = (eventTarget: Window) => {
 };
 
 // checks conditions before updating new input
-const setInput = event => {
+const setInput = (event: WhatInputEvents) => {
   // only execute if the event buffer timer isn't running
   if (!isBuffering) {
     const eventKey = event.which;
@@ -133,7 +135,7 @@ const doUpdate = (target: Document) => {
 };
 
 // buffers events that frequently also fire mouse events
-const eventBuffer = event => {
+const eventBuffer = (event: WhatInputEvents) => {
   // set the current input
   setInput(event);