diff --git a/src/lib/util/basic/list.ts b/src/lib/util/basic/list.ts
index ffc672f..47219e2 100644
--- a/src/lib/util/basic/list.ts
+++ b/src/lib/util/basic/list.ts
@@ -1,36 +1,43 @@
-export type Nil = { readonly _tag: 'Nil' };
+export type Nil = {readonly _tag: 'Nil'}
 export type Cons<A> = {
-  readonly _tag: 'Cons';
-  readonly head: A;
-  readonly tail: List<A>;
-};
-export type List<A> = Nil | Cons<A>;
+  readonly _tag: 'Cons',
+  readonly head: A,
+  readonly tail: List<A>,
+}
+export type List<A> = Nil | Cons<A>
 
 // Constructors
-export const nil: Nil = { _tag: 'Nil' };
+export const nil: Nil = {_tag: 'Nil'}
 export const cons = <A>(head: A, tail: List<A>): List<A> => ({
   _tag: 'Cons',
   head,
   tail,
-});
+})
 
 // Operations
-type ListMap = <A, B>(f: (a: A) => B) => (fa: List<A>) => List<B>;
-export const listMap: ListMap = (f) => (fa) =>
-  fa._tag === 'Cons' ? cons(f(fa.head), listMap(f)(fa.tail)) : nil;
+type ListMap = <A, B>(f: (a: A) => B) => (fa: List<A>) => List<B>
+export const listMap: ListMap = f => fa =>
+  fa._tag === 'Cons' ? cons(f(fa.head), listMap(f)(fa.tail)) : nil
 
 type ListReduce = <A, B>(
   f: (b: B, a: A) => B,
-  initial: B
-) => (fa: List<A>) => B;
-export const listReduce: ListReduce = (f, initial) => (fa) =>
-  fa._tag === 'Cons' ? listReduce(f, f(initial, fa.head))(fa.tail) : initial;
+  initial: B,
+) => (fa: List<A>) => B
+export const listReduce: ListReduce = (f, initial) => fa =>
+  fa._tag === 'Cons' ? listReduce(f, f(initial, fa.head))(fa.tail)
+    : initial
 
 // Helpers
-type FromArray = <A>(arr: Array<A>) => List<A>;
+type FromArray = <A>(arr: Array<A>) => List<A>
 export const fromArray: FromArray = <A>(arr: Array<A>) =>
-  arr.reduceRight((acc: List<A>, val: A) => cons(val, acc), nil as List<A>);
+  arr.reduceRight(
+    (acc: List<A>, val: A) => cons(val, acc),
+    nil as List<A>,
+  )
 
-type ToArray = <A>(fa: List<A>) => Array<A>;
+type ToArray = <A>(fa: List<A>) => Array<A>
 export const toArray: ToArray = <A>(fa: List<A>) =>
-  listReduce<A, Array<A>>((acc, val) => [...acc, val], [] as Array<A>)(fa);
+  listReduce<A, Array<A>>(
+    (acc, val) => [...acc, val],
+    [] as Array<A>,
+  )(fa)