Merge pull request microsoft#7350 from basarat/patch-1

fix(build) `TypingResolutionHost` interface is used by exported function `discoverTypings`

Author: mhegazy

src/services/jsTyping.ts

@@ -6,7 +6,7 @@
 /* @internal */
 namespace ts.JsTyping {
 
- interface TypingResolutionHost {
+ export interface TypingResolutionHost {
  directoryExists: (path: string) => boolean;
  fileExists: (fileName: string) => boolean;
  readFile: (path: string, encoding?: string) => string;