Clear the module resolution cache when new @types appear

Author: RyanCavanaugh

src/server/editorServices.ts

@@ -547,9 +547,11 @@ namespace ts.server {
             }
             switch (response.kind) {
                 case ActionSet:
+                    project.resolutionCache.clear();
                     this.typingsCache.updateTypingsForProject(response.projectName, response.compilerOptions, response.typeAcquisition, response.unresolvedImports, response.typings);
                     break;
                 case ActionInvalidate:
+                    project.resolutionCache.clear();
                     this.typingsCache.deleteTypingsForProject(response.projectName);
                     break;
             }