Fix a bunch of type errors and add a type-check to the github workflows (#837)

* Add yarn type-check

* Rename to yarn typecheck

* Fix a collection of type errors

* Add typecheck to automated tests

* add `dist` to exluded folders tsconfig

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Co-authored-by: Ansh Nanda <anshnanda10@gmail.com>

src/lib/hooks/useTimer.ts

@@ -4,7 +4,7 @@ import * as React from 'react'
  * Helper hook to run persistent timers on views
  */
 export function useTimer(time: number, handler: () => void) {
-  const timer = React.useRef(undefined)
+  const timer = React.useRef<undefined | NodeJS.Timeout>(undefined)
 
   // function to restart the timer
   const reset = React.useCallback(() => {