Add minimal failing test

tests/cases/compiler/checkerInitializationCrash.ts

@@ -0,0 +1,40 @@
+// @module: esnext
+// @moduleResolution: node
+// @esModuleInterop: true
+
+// @Filename: /node_modules/@fullcalendar/react/index.d.ts
+import * as react from 'react';
+declare global {
+  namespace FullCalendarVDom {
+    export import VNode = react.ReactNode;
+  }
+}
+
+export default class FullCalendar {
+}
+
+// @Filename: /node_modules/@fullcalendar/core/index.d.ts
+import * as preact from 'preact';
+declare global {
+  namespace FullCalendarVDom {
+    type VNode = preact.VNode<any>;
+  }
+}
+
+export type EventInput = any;
+
+// @Filename: /node_modules/@types/react/index.d.ts
+export = React;
+export as namespace React;
+declare namespace React {
+    type ReactNode = any;
+    function useMemo<T>(factory: () => T, deps: undefined): T;
+}
+
+// @Filename: /node_modules/preact/index.d.ts
+export as namespace preact;
+export interface VNode<P = {}> {}
+
+// @Filename: /index.tsx
+import FullCalendar from "@fullcalendar/react";
+import { EventInput } from "@fullcalendar/core";