clean up miles's bad code

lib/components/map/itinerary-summary-overlay.tsx

@@ -5,7 +5,7 @@ import { Marker } from 'react-map-gl'
 import centroid from '@turf/centroid'
 import distance from '@turf/distance'
 import polyline from '@mapbox/polyline'
-import React, { useContext, useState } from 'react'
+import React, { useContext } from 'react'
 import styled from 'styled-components'
 
 import * as narriativeActions from '../../actions/narrative'
@@ -147,17 +147,14 @@ const ItinerarySummaryOverlay = ({
   // @ts-expect-error React context is populated dynamically
   const { LegIcon } = useContext(ComponentContext)
 
-  const [sharedTimeout, setSharedTimeout] = useState<null | NodeJS.Timeout>(
-    null
-  )
-
   if (!itins || !visible) return <></>
   const indexedItins: ItinWithGeometry[] = addTrueIndex(
     itins.map(addItinLineString)
   )
-  const mergedItins = doMergeItineraries(indexedItins).mergedItineraries
+  const mergedItins: ItinWithGeometry[] =
+    doMergeItineraries(indexedItins).mergedItineraries
 
-  const midPoints = mergedItins.reduce(
+  const midPoints = mergedItins.reduce<ItinUniquePoint[]>(
     (prev: ItinUniquePoint[], curItin: ItinWithGeometry) => {
       prev.push(getUniquePoint(curItin, prev))
       return prev
@@ -173,10 +170,7 @@ const ItinerarySummaryOverlay = ({
     return (
       <>
         {midPoints.map(
-          (mp: {
-            itin: Itinerary & { index: number }
-            uniquePoint: [number, number]
-          }) =>
+          (mp) =>
             // If no itinerary is hovered, show all of them. If one is selected, show only that one
             // TODO: clean up conditionals, move these to a more appropriate place without breaking indexing
             (isDefined(visibleItinerary)