We may not always get file notifications for file creation, so always check for failed lookups starting with the path as well as exact path (#59882)

Author: sheetalkamat

src/compiler/resolutionCache.ts

@@ -1537,6 +1537,10 @@ export function createResolutionCache(resolutionHost: ResolutionCacheHost, rootD
                 // Resolution need to be invalidated if failed lookup location is same as the file or directory getting created
                 (failedLookupChecks ||= new Set()).add(fileOrDirectoryPath);
 
+                // Also any path that starts with this path should be added just in case if this is directory notification
+                // and we dont get any notification for file
+                (startsWithPathChecks ||= new Set()).add(fileOrDirectoryPath);
+
                 // If the invalidated file is from a node_modules package, invalidate everything else
                 // in the package since we might not get notifications for other files in the package.
                 // This hardens our logic against unreliable file watchers.

src/testRunner/unittests/tscWatch/resolutionCache.ts

@@ -720,4 +720,41 @@ declare namespace NodeJS {
             },
         ],
     });
+
+    verifyTscWatch({
+        scenario,
+        subScenario: "when dir watcher is invoked without file change",
+        commandLineArgs: ["--w", "--traceResolution", "--extendedDiagnostics"],
+        sys: () =>
+            TestServerHost.createWatchedSystem({
+                "/home/src/workspaces/project/src/main.ts": dedent`
+                        import { y } from "./app/services/generated";
+                        const x = y;
+                    `,
+                "/home/src/workspaces/project/src/app/services/generated/index.ts": "export const y = 10;",
+                "/home/src/workspaces/project/tsconfig.json": "{}",
+            }),
+        edits: [
+            {
+                caption: "delete folder",
+                edit: sys => sys.deleteFolder("/home/src/workspaces/project/src/app/services/generated", /*recursive*/ true),
+                timeouts: sys => {
+                    sys.runQueuedTimeoutCallbacks();
+                    sys.runQueuedTimeoutCallbacks();
+                },
+            },
+            {
+                caption: "generate folder",
+                edit: sys =>
+                    sys.ensureFileOrFolder({
+                        path: "/home/src/workspaces/project/src/app/services/generated/index.ts",
+                        content: "export const y = 10;",
+                    }, /*ignoreWatchInvokedWithTriggerAsFileCreate*/ true),
+                timeouts: sys => {
+                    sys.runQueuedTimeoutCallbacks();
+                    sys.runQueuedTimeoutCallbacks();
+                },
+            },
+        ],
+    });
 });