Fix premature closing of AutoImportProviderProject for unbuilt monorepos (#40620)

* Fix premature closing of AutoImportProviderProject for unbuilt monorepos

* Update src/server/project.ts

Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>

* Update API baseline

* Don’t override hasRoots

* Update API baselines

* Really actually update baselines

Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>

src/server/project.ts

@@ -1671,7 +1671,7 @@ namespace ts.server {
             }
             if (this.autoImportProviderHost) {
                 updateProjectIfDirty(this.autoImportProviderHost);
-                if (!this.autoImportProviderHost.hasRoots()) {
+                if (this.autoImportProviderHost.isEmpty()) {
                     this.autoImportProviderHost.close();
                     this.autoImportProviderHost = undefined;
                     return undefined;
@@ -1935,6 +1935,11 @@ namespace ts.server {
             this.rootFileNames = initialRootNames;
         }
 
+        /*@internal*/
+        isEmpty() {
+            return !some(this.rootFileNames);
+        }
+
         isOrphan() {
             return true;
         }

src/testRunner/unittests/tsserver/autoImportProvider.ts

@@ -283,6 +283,25 @@ namespace ts.projectSystem {
             // Project for A is created - ensure it doesn't have an autoImportProvider
             assert.isUndefined(projectService.configuredProjects.get("/packages/a/tsconfig.json")!.getLanguageService().getAutoImportProvider());
         });
+
+        it("Does not close when root files are redirects that don't actually exist", () => {
+            const files = [
+                // packages/a
+                { path: "/packages/a/package.json", content: `{ "dependencies": { "b": "*" } }` },
+                { path: "/packages/a/tsconfig.json", content: `{ "compilerOptions": { "composite": true }, "references": [{ "path": "./node_modules/b" }] }` },
+                { path: "/packages/a/index.ts", content: "" },
+
+                // packages/b
+                { path: "/packages/a/node_modules/b/package.json", content: `{ "types": "dist/index.d.ts" }` },
+                { path: "/packages/a/node_modules/b/tsconfig.json", content: `{ "compilerOptions": { "composite": true, "outDir": "dist" } }` },
+                { path: "/packages/a/node_modules/b/index.ts", content: `export class B {}` }
+            ];
+
+            const { projectService, session } = setup(files);
+            openFilesForSession([files[2]], session);
+            assert.isDefined(projectService.configuredProjects.get("/packages/a/tsconfig.json")!.getPackageJsonAutoImportProvider());
+            assert.isDefined(projectService.configuredProjects.get("/packages/a/tsconfig.json")!.getPackageJsonAutoImportProvider());
+        });
     });
 
     function setup(files: File[]) {