diff --git a/tests/cases/compiler/normalizedIntersectionTooComplex.ts b/tests/cases/compiler/normalizedIntersectionTooComplex.ts
new file mode 100644
index 0000000000000..dff8bb120198f
--- /dev/null
+++ b/tests/cases/compiler/normalizedIntersectionTooComplex.ts
@@ -0,0 +1,38 @@
+// @strict: true
+
+// Repro from #30050
+
+interface Obj<T> {
+	ref: T;
+}
+interface Func<T> {
+	(x: T): void;
+}
+type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends ((k: infer I) => void) ? I : never;
+type CtorOf<T> = (arg: UnionToIntersection<T>) => T;
+
+interface Big {
+    "0": { common?: string; "0"?: number, ref?: Obj<Big["0"]> | Func<Big["0"]>; }
+    "1": { common?: string; "1"?: number, ref?: Obj<Big["1"]> | Func<Big["1"]>; }
+    "2": { common?: string; "2"?: number, ref?: Obj<Big["2"]> | Func<Big["2"]>; }
+    "3": { common?: string; "3"?: number, ref?: Obj<Big["3"]> | Func<Big["3"]>; }
+    "4": { common?: string; "4"?: number, ref?: Obj<Big["4"]> | Func<Big["4"]>; }
+    "5": { common?: string; "5"?: number, ref?: Obj<Big["5"]> | Func<Big["5"]>; }
+    "6": { common?: string; "6"?: number, ref?: Obj<Big["6"]> | Func<Big["6"]>; }
+    "7": { common?: string; "7"?: number, ref?: Obj<Big["7"]> | Func<Big["7"]>; }
+    "8": { common?: string; "8"?: number, ref?: Obj<Big["8"]> | Func<Big["8"]>; }
+    "9": { common?: string; "9"?: number, ref?: Obj<Big["9"]> | Func<Big["9"]>; }
+    "10": { common?: string; "10"?: number, ref?: Obj<Big["10"]> | Func<Big["10"]>; }
+    "11": { common?: string; "11"?: number, ref?: Obj<Big["11"]> | Func<Big["11"]>; }
+    "12": { common?: string; "12"?: number, ref?: Obj<Big["12"]> | Func<Big["12"]>; }
+    "13": { common?: string; "13"?: number, ref?: Obj<Big["13"]> | Func<Big["13"]>; }
+    "14": { common?: string; "14"?: number, ref?: Obj<Big["14"]> | Func<Big["14"]>; }
+    "15": { common?: string; "15"?: number, ref?: Obj<Big["15"]> | Func<Big["15"]>; }
+    "16": { common?: string; "16"?: number, ref?: Obj<Big["16"]> | Func<Big["16"]>; }
+    "17": { common?: string; "17"?: number, ref?: Obj<Big["17"]> | Func<Big["17"]>; }
+}
+declare function getCtor<T extends keyof Big>(comp: T): CtorOf<Big[T]>
+
+declare var all: keyof Big;
+const ctor = getCtor(all);
+const comp = ctor({ common: "ok", ref: x => console.log(x) });