WIP: Fix TypeScript type inference for functions passed to map

fluture-js · Jan 7, 2021 · 88152a2 · 88152a2
1 parent 76c48d0
commit 88152a2
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/test/types/map.test-d.ts b/test/types/map.test-d.ts
@@ -19,3 +19,7 @@ expectType<fl.ConcurrentFutureInstance<string, string>> (fl.map (String) (reject
 // Usage with pipe on Future instances (https://git.io/JLx3F).
 expectType<fl.FutureInstance<never, string>> (resolved .pipe (fl.map (String)));
 expectType<fl.FutureInstance<string, string>> (rejected .pipe (fl.map (String)));
+
+// Function parameter inference from the second argument in a pipe (https://git.io/JLxsX).
+expectType<fl.FutureInstance<never, number>> (resolved .pipe (fl.map (x => x)));
+expectType<fl.FutureInstance<string, number>> (rejected .pipe (fl.map (x => x)));