Add regression test

tests/cases/compiler/indirectTypeParameterReferences.ts

@@ -0,0 +1,24 @@
+// Repro from #19043
+
+type B = {b: string}
+
+const flowtypes = <A>(b: B) => {
+  type Combined = A & B
+
+  const combined = (fn: (combined: Combined) => void) => null
+  const literal = (fn: (aPlusB: A & B) => void) => null
+
+  return {combined, literal}
+}
+
+const {combined, literal} = flowtypes<{a: string}>({b: 'b-value'})
+
+literal(aPlusB => {
+  aPlusB.b
+  aPlusB.a
+})
+
+combined(comb => {
+  comb.b
+  comb.a
+})