feat(nul): add TS support

bigslycat · bigslycat · commit 4f49725a108a · 2019-03-03T05:43:18.000+05:00
diff --git a/src/index.d.ts b/src/index.d.ts
@@ -78,3 +78,7 @@ export declare var lit: typeof literal;
 export declare var isLit: typeof literal;
 export declare var passLit: typeof literal;
 
+export declare var nul: Contract<null>;
+export declare var isNull: typeof nul;
+export declare var passNull: typeof nul;
+
