develop (#43)

* fix(ts): use strict mode strictNullChecks etc

* chore: Use extended React.HTMLAttributes<> (#41)

* refactor(code-format): add prettier closes #42

* feat(renderer): add snap to grid option closes #20

* chore(dependabot): use develop as target branch

src/hooks/useKeyPress.ts

@@ -2,7 +2,7 @@ import { useState, useEffect } from 'react';
 
 import { isInputDOMNode } from '../utils';
 
-export default (keyCode: number) => {
+export default (keyCode: number): boolean => {
   const [keyPressed, setKeyPressed] = useState(false);
 
   function downHandler(evt: KeyboardEvent) {
@@ -28,4 +28,4 @@ export default (keyCode: number) => {
   }, []);
 
   return keyPressed;
-}
+};