WIP parse grade tables at run time

sandbag requires that json files in `src/data/` be regenerated and
committed whenever grade tables change.  This is error prone for two
reasons:
- CI doesn't check that the conversion script works.
- CI doesn't check that the conversion script was run.

Simplify this by changing `src/data/csvtojson.ts` to a module that
exports the requisite tables.

src/GradeScale.ts

@@ -1,4 +1,7 @@
 import { GradeBandTypes } from './GradeBands'
+import { BOULDER_GRADE_TABLE, ROUTE_GRADE_TABLE, ICE_GRADE_TABLE, AID_GRADE_TABLE } from './data/csvtojson'
+
+export { BOULDER_GRADE_TABLE, ROUTE_GRADE_TABLE, ICE_GRADE_TABLE, AID_GRADE_TABLE }
 
 export type Tuple = [number, number]
 
@@ -47,3 +50,4 @@ export const findScoreRange = (compareFn, list): number | Tuple => {
 export function getAvgScore (score: number | Tuple): number {
   return typeof score === 'number' ? score : (score[1] + score[0]) / 2
 }
+

src/data/csvtojson.ts

@@ -40,7 +40,8 @@ function parseRowBoulder (row): Object {
     font: row['Font Scale']
   }
 }
-void getData(CSV_PATH_BOULDER, JSON_PATH_BOULDER, boulderGrades, parseRowBoulder)
+const BOULDER_GRADE_TABLE = getData(CSV_PATH_BOULDER, JSON_PATH_BOULDER, boulderGrades, parseRowBoulder)
+export await BOULDER_GRADE_TABLE
 
 const CSV_PATH_ROUTES = path.join(dataDir, 'routes.csv')
 const JSON_PATH_ROUTES = path.join(dataDir, 'routes.json')
@@ -56,7 +57,8 @@ function parseRowRoutes (row): Object {
     norwegian: row.Norwegian
   }
 }
-void getData(CSV_PATH_ROUTES, JSON_PATH_ROUTES, routeGrades, parseRowRoutes)
+const ROUTE_GRADE_TABLE = getData(CSV_PATH_ROUTES, JSON_PATH_ROUTES, routeGrades, parseRowRoutes)
+export await ROUTE_GRADE_TABLE
 
 const CSV_PATH_ICE = path.join(dataDir, 'ice.csv')
 const JSON_PATH_ICE = path.join(dataDir, 'ice.json')
@@ -68,7 +70,8 @@ function parseRowIce (row): Object {
     ai: row.AI
   }
 }
-void getData(CSV_PATH_ICE, JSON_PATH_ICE, iceGrades, parseRowIce)
+const ICE_GRADE_TABLE = getData(CSV_PATH_ICE, JSON_PATH_ICE, iceGrades, parseRowIce)
+export await ICE_GRADE_TABLE
 
 const CSV_PATH_AID = path.join(dataDir, 'aid.csv')
 const JSON_PATH_AID = path.join(dataDir, 'aid.json')
@@ -79,4 +82,5 @@ function parseRowAid (row): Object {
     aid: row.Aid
   }
 }
-void getData(CSV_PATH_AID, JSON_PATH_AID, aidGrades, parseRowAid)
+const AID_GRADE_TABLE = getData(CSV_PATH_AID, JSON_PATH_AID, aidGrades, parseRowAid)
+export await AID_GRADE_TABLE