Fix issue with trailing directory separator not present if symlink wasnt detected by program

src/compiler/utilities.ts

@@ -8802,9 +8802,15 @@ export function hasZeroOrOneAsteriskCharacter(str: string): boolean {
 
 /** @internal */
 export interface SymlinkedDirectory {
-    /** Matches the casing returned by `realpath`.  Used to compute the `realpath` of children. */
+    /**
+     * Matches the casing returned by `realpath`.  Used to compute the `realpath` of children.
+     * Always has trailing directory separator
+     */
     real: string;
-    /** toPath(real).  Stored to avoid repeated recomputation. */
+    /**
+     * toPath(real).  Stored to avoid repeated recomputation.
+     * Always has trailing directory separator
+     */
     realPath: Path;
 }
 
@@ -8859,7 +8865,7 @@ export function createSymlinkCache(cwd: string, getCanonicalFileName: GetCanonic
             if (!containsIgnoredPath(symlinkPath)) {
                 symlinkPath = ensureTrailingDirectorySeparator(symlinkPath);
                 if (real !== false && !symlinkedDirectories?.has(symlinkPath)) {
-                    (symlinkedDirectoriesByRealpath ||= createMultiMap()).add(ensureTrailingDirectorySeparator(real.realPath), symlink);
+                    (symlinkedDirectoriesByRealpath ||= createMultiMap()).add(real.realPath, symlink);
                 }
                 (symlinkedDirectories || (symlinkedDirectories = new Map())).set(symlinkPath, real);
             }
@@ -8882,7 +8888,10 @@ export function createSymlinkCache(cwd: string, getCanonicalFileName: GetCanonic
         if (commonResolved && commonOriginal) {
             cache.setSymlinkedDirectory(
                 commonOriginal,
-                { real: commonResolved, realPath: toPath(commonResolved, cwd, getCanonicalFileName) },
+                {
+                    real: ensureTrailingDirectorySeparator(commonResolved),
+                    realPath: ensureTrailingDirectorySeparator(toPath(commonResolved, cwd, getCanonicalFileName)),
+                },
             );
         }
     }

src/server/project.ts

@@ -30,6 +30,7 @@ import {
     DirectoryWatcherCallback,
     DocumentPositionMapper,
     DocumentRegistry,
+    ensureTrailingDirectorySeparator,
     enumerateInsertsAndDeletes,
     every,
     explainFiles,
@@ -2520,8 +2521,8 @@ export class AutoImportProviderProject extends Project {
                 const isSymlink = realPath && realPath !== hostProject.toPath(packageJson.packageDirectory);
                 if (isSymlink) {
                     symlinkCache.setSymlinkedDirectory(packageJson.packageDirectory, {
-                        real: real!,
-                        realPath,
+                        real: ensureTrailingDirectorySeparator(real!),
+                        realPath: ensureTrailingDirectorySeparator(realPath),
                     });
                 }
 

src/testRunner/unittests/helpers/virtualFileSystemWithWatch.ts

@@ -109,7 +109,7 @@ export interface SymLink {
 
 export type FileOrFolderOrSymLink = File | Folder | SymLink;
 export interface FileOrFolderOrSymLinkMap {
-    [path: string]: string | Omit<FileOrFolderOrSymLink, "path">;
+    [path: string]: string | Omit<File, "path"> | Omit<SymLink, "path"> | undefined;
 }
 export function isFile(fileOrFolderOrSymLink: FileOrFolderOrSymLink): fileOrFolderOrSymLink is File {
     return isString((fileOrFolderOrSymLink as File).content);

src/testRunner/unittests/tsserver/moduleResolution.ts

@@ -1,15 +1,25 @@
-import * as Utils from "../../_namespaces/Utils";
+import * as ts from "../../_namespaces/ts";
+import {
+    dedent,
+} from "../../_namespaces/Utils";
+import {
+    libContent,
+} from "../helpers/contents";
 import {
     getFsConentsForNode10ResultAtTypesPackageJson,
     getFsContentsForNode10Result,
     getFsContentsForNode10ResultDts,
     getFsContentsForNode10ResultPackageJson,
 } from "../helpers/node10Result";
+import {
+    solutionBuildWithBaseline,
+} from "../helpers/solutionBuilder";
 import {
     baselineTsserverLogs,
     createLoggerWithInMemoryLogs,
     createSession,
     openFilesForSession,
+    protocolTextSpanFromSubstring,
     verifyGetErrRequest,
 } from "../helpers/tsserver";
 import {
@@ -38,14 +48,14 @@ describe("unittests:: tsserver:: moduleResolution", () => {
             };
             const fileA: File = {
                 path: `/user/username/projects/myproject/src/fileA.ts`,
-                content: Utils.dedent`
+                content: dedent`
                         import { foo } from "./fileB.mjs";
                         foo();
                     `,
             };
             const fileB: File = {
                 path: `/user/username/projects/myproject/src/fileB.mts`,
-                content: Utils.dedent`
+                content: dedent`
                         export function foo() {
                         }
                     `,
@@ -195,4 +205,116 @@ describe("unittests:: tsserver:: moduleResolution", () => {
             });
         }
     });
+
+    describe("using referenced project", () => {
+        it("not built", () => {
+            verify();
+        });
+        it("built", () => {
+            verify(/*built*/ true);
+        });
+        function verify(built?: boolean) {
+            const indexContent = dedent`
+                import { FOO } from "package-a";
+                console.log(FOO);
+            `;
+            const host = createServerHost({
+                "/home/src/projects/project/packages/package-a/package.json": getPackageJson("package-a"),
+                "/home/src/projects/project/packages/package-a/tsconfig.json": getTsConfig(),
+                "/home/src/projects/project/packages/package-a/src/index.ts": `export * from "./subfolder";`,
+                "/home/src/projects/project/packages/package-a/src/subfolder/index.ts": `export const FOO = "bar";`,
+                "/home/src/projects/project/packages/package-b/package.json": getPackageJson("package-b"),
+                "/home/src/projects/project/packages/package-b/tsconfig.json": getTsConfig([{ path: "../package-a" }]),
+                "/home/src/projects/project/packages/package-b/src/index.ts": indexContent,
+                "/home/src/projects/project/node_modules/package-a": { symLink: "/home/src/projects/project/packages/package-a" },
+                "/home/src/projects/project/node_modules/package-b": { symLink: "/home/src/projects/project/packages/package-b" },
+                "/a/lib/lib.es2021.d.ts": libContent,
+            }, { currentDirectory: "/home/src/projects/project" });
+            if (built) {
+                solutionBuildWithBaseline(host, ["packages/package-b"]);
+                host.clearOutput();
+            }
+            const session = createSession(host, { logger: createLoggerWithInMemoryLogs(host), canUseEvents: true });
+            openFilesForSession(["/home/src/projects/project/packages/package-b/src/index.ts"], session);
+            verifyGetErrRequest({
+                session,
+                files: ["/home/src/projects/project/packages/package-b/src/index.ts"],
+            });
+            const { end } = protocolTextSpanFromSubstring(indexContent, "package-a");
+            session.executeCommandSeq<ts.server.protocol.UpdateOpenRequest>({
+                command: ts.server.protocol.CommandTypes.UpdateOpen,
+                arguments: {
+                    changedFiles: [{
+                        fileName: "/home/src/projects/project/packages/package-b/src/index.ts",
+                        textChanges: [{
+                            start: end,
+                            end,
+                            newText: "X",
+                        }],
+                    }],
+                },
+            });
+            verifyGetErrRequest({
+                session,
+                files: ["/home/src/projects/project/packages/package-b/src/index.ts"],
+            });
+            session.executeCommandSeq<ts.server.protocol.UpdateOpenRequest>({
+                command: ts.server.protocol.CommandTypes.UpdateOpen,
+                arguments: {
+                    changedFiles: [{
+                        fileName: "/home/src/projects/project/packages/package-b/src/index.ts",
+                        textChanges: [{
+                            start: end,
+                            end: { ...end, offset: end.offset + 1 },
+                            newText: "",
+                        }],
+                    }],
+                },
+            });
+            verifyGetErrRequest({
+                session,
+                files: ["/home/src/projects/project/packages/package-b/src/index.ts"],
+            });
+            baselineTsserverLogs("moduleResolution", `using referenced project${built ? " built" : ""}`, session);
+        }
+        function getPackageJson(packageName: string) {
+            return JSON.stringify(
+                {
+                    name: packageName,
+                    version: "1.0.0",
+                    type: "module",
+                    main: "build/index.js",
+                    exports: {
+                        ".": "./build/index.js",
+                        "./package.json": "./package.json",
+                        "./*": ["./build/*/index.js", "./build/*.js"],
+                    },
+                },
+                undefined,
+                " ",
+            );
+        }
+
+        function getTsConfig(references?: object[]) {
+            return JSON.stringify({
+                compilerOptions: {
+                    allowSyntheticDefaultImports: true,
+                    baseUrl: "./",
+                    composite: true,
+                    declarationMap: true,
+                    esModuleInterop: true,
+                    lib: ["es2021"],
+                    module: "esnext",
+                    moduleResolution: "bundler",
+                    outDir: "build",
+                    rootDir: "./src",
+                    target: "ES2021",
+                    traceResolution: true,
+                    tsBuildInfoFile: "./build/tsconfig.tsbuildinfo",
+                },
+                include: ["./src/**/*.ts"],
+                references,
+            });
+        }
+    });
 });