chore(common): revert a621f1a 79c1d9e

They can stay in src now and are transpiled down & out with 6eda1f8

Author: CarsonF

packages/common/src/group-by.ts

@@ -20,8 +20,7 @@ export const groupToMapBy = <K, V>(
 ): ReadonlyMap<K, NonEmptyArray<V>> =>
   [...items].reduce((map, item) => {
     const groupKey = by(item);
-    let prev: readonly V[] | undefined = map.get(groupKey);
-    prev = prev ? prev : [];
+    const prev: readonly V[] | undefined = map.get(groupKey) ?? [];
     map.set(groupKey, asNonEmptyArray([...prev, item])!);
     return map;
   }, new Map<K, NonEmptyArray<V>>());

packages/common/src/inspect.ts

@@ -198,7 +198,7 @@ const wrapInspect = <TThis>(
         };
 
   return function (depth, options, inspect) {
-    depth = depth != null ? depth : Infinity;
+    depth ??= Infinity;
     return fn.call(this, {
       ...options,
       depth,

packages/common/src/sort-by.ts

@@ -13,9 +13,7 @@ export function sortBy<T>(
   list: Iterable<T>,
   criteria?: SortCriteria<T>,
 ): readonly T[] {
-  return [...list].sort(
-    cmpBy(criteria ? criteria : (x: T) => x as SortableValue),
-  );
+  return [...list].sort(cmpBy(criteria ?? ((x: T) => x as SortableValue)));
 }
 
 export const cmpBy = <T>(criteria: SortCriteria<T>) => {