getNullableType: fix TS signature (graphql#2460)

partial revert of graphql@23b427c#diff-15f6b6c92ff954f80995d31726f89851L477 Reported by @yaacovCR here: yaacovCR/graphql-tools-fork#40 (comment)
IvanGoncharov · Feb 18, 2020 · 3f859d4 · 3f859d4
1 parent 268888b
commit 3f859d4
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diff --git a/src/type/definition.d.ts b/src/type/definition.d.ts
@@ -241,8 +241,10 @@ export function isNullableType(type: any): type is GraphQLNullableType;
 export function assertNullableType(type: any): GraphQLNullableType;
 
 export function getNullableType(type: void): undefined;
+export function getNullableType<T extends GraphQLNullableType>(type: T): T;
 export function getNullableType<T extends GraphQLNullableType>(
-  type: GraphQLNonNull<T> | T,
+  // eslint-disable-next-line @typescript-eslint/unified-signatures
+  type: GraphQLNonNull<T>,
 ): T;
 
 /**

diff --git a/src/type/definition.js b/src/type/definition.js
@@ -474,7 +474,8 @@ export function assertNullableType(type: mixed): GraphQLNullableType {
 
 /* eslint-disable no-redeclare */
 declare function getNullableType(type: void | null): void;
-declare function getNullableType<T>(type: GraphQLNonNull<T> | T): T;
+declare function getNullableType<T: GraphQLNullableType>(type: T): T;
+declare function getNullableType<T>(type: GraphQLNonNull<T>): T;
 export function getNullableType(type) {
   /* eslint-enable no-redeclare */
   if (type) {