fix genType test

Author: cometkim

jscomp/gentype_tests/typescript-react-example/src/BigInt.res

@@ -51,9 +51,7 @@ export const date0: (x:Date) => Date = CoreJS.date0 as any;
 
 export const date1: (x:Date) => Date = CoreJS.date1 as any;
 
-export const bigint0: (x:BigInt) => BigInt = CoreJS.bigint0 as any;
-
-export const bigint1: (x:BigInt) => BigInt = CoreJS.bigint1 as any;
+export const bigint0: (x:bigint) => bigint = CoreJS.bigint0 as any;
 
 export const regexp0: (x:RegExp) => RegExp = CoreJS.regexp0 as any;
 

jscomp/gentype_tests/typescript-react-example/src/BigInt.res.js

@@ -35,10 +35,7 @@ let date0 = (x: Js.Date.t) => x
 let date1 = (x: Date.t) => x
 
 @genType
-let bigint0 = (x: Js.Types.bigint_val) => x
-
-@genType
-let bigint1 = (x: BigInt.t) => x
+let bigint0 = (x: bigint) => x
 
 @genType
 let regexp0 = (x: Js.Re.t) => x