feat: support literals

Author: holvonixAdvay

README.md

@@ -48,6 +48,7 @@ Currently supports:
 * `t.void`
 * `t.unknown`
 * `t.Int`
+* `t.literal`
 
 ## Use Cases
 

src/core/core.ts

@@ -115,6 +115,16 @@ export function fuzzUnknown(n: number): unknown {
   return n;
 }
 
+export function fuzzLiteral(
+  b: t.LiteralType<string | number | boolean>
+): ConcreteFuzzer<unknown> {
+  return {
+    func: n => {
+      return b.value;
+    },
+  };
+}
+
 export function fuzzUnion(b: t.UnionType<t.Mixed[]>): ConcreteFuzzer<unknown> {
   return {
     children: b.types,
@@ -206,4 +216,5 @@ export const coreFuzzers = [
   gen(fuzzPartial, 'PartialType'),
   gen(fuzzArray, 'ArrayType'),
   gen(fuzzIntersection, 'IntersectionType'),
+  gen(fuzzLiteral, 'LiteralType'),
 ];

test/helpers.ts

@@ -15,7 +15,12 @@ export const types = [
   t.unknown,
   t.array(t.string),
   t.Int,
-
+  t.literal('hello'),
+  t.literal(34.4),
+  t.literal(true),
+  t.literal(''),
+  t.literal(0),
+  t.literal(false),
   // Complex types
   t.type({ s: t.string, m: t.type({ n: t.Int }) }),
   t.type({