add missing file

Author: zardoy

typescript/src/utilTypes.ts

@@ -0,0 +1,14 @@
+import { ConditionalPick } from 'type-fest'
+
+type Tail<T> = T extends readonly [...any[], infer U] ? U : never
+type GetIs<T> = T extends (elem: any) => elem is infer T ? T : never
+
+type TSNodeIs = ConditionalPick<typeof ts, (node: ts.Node) => node is ts.Node>
+type Comparisons = {
+    [T in keyof TSNodeIs as T extends `is${infer U}` ? /* Uncapitalize<U> */ U : never]: GetIs<(typeof ts)[T & keyof typeof ts]>
+}
+
+export type MatchParentsType = <K extends keyof Comparisons, const T extends readonly [...K[]]>(
+    node: ts.Node | undefined,
+    treeToCompare: T,
+) => Comparisons[Tail<T> & keyof Comparisons] | undefined