diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 864cc0268e..78947dd88e 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -1981,28 +1981,17 @@ namespace ts.server {
                 totalNonTsFileSize += this.host.getFileSize(fileName);
 
                 if (totalNonTsFileSize > maxProgramSizeForNonTsFiles || totalNonTsFileSize > availableSpace) {
-                    this.logger.info(getExceedLimitMessage({ propertyReader, hasTSFileExtension: ts.hasTSFileExtension, host: this.host }, totalNonTsFileSize)); // eslint-disable-line @typescript-eslint/no-unnecessary-qualifier
+                    const top5LargestFiles = fileNames.map(f => propertyReader.getFileName(f))
+                        .filter(name => !hasTSFileExtension(name))
+                        .map(name => ({ name, size: this.host.getFileSize!(name) }))
+                        .sort((a, b) => b.size - a.size)
+                        .slice(0, 5);
+                    this.logger.info(`Non TS file size exceeded limit (${totalNonTsFileSize}). Largest files: ${top5LargestFiles.map(file => `${file.name}:${file.size}`).join(", ")}`);
                     // Keep the size as zero since it's disabled
                     return fileName;
                 }
             }
-
             this.projectToSizeMap.set(name, totalNonTsFileSize);
-
-            return;
-
-            function getExceedLimitMessage(context: { propertyReader: FilePropertyReader<any>, hasTSFileExtension: (filename: string) => boolean, host: ServerHost }, totalNonTsFileSize: number) {
-                const files = getTop5LargestFiles(context);
-
-                return `Non TS file size exceeded limit (${totalNonTsFileSize}). Largest files: ${files.map(file => `${file.name}:${file.size}`).join(", ")}`;
-            }
-            function getTop5LargestFiles({ propertyReader, hasTSFileExtension, host }: { propertyReader: FilePropertyReader<any>, hasTSFileExtension: (filename: string) => boolean, host: ServerHost }) {
-                return fileNames.map(f => propertyReader.getFileName(f))
-                    .filter(name => hasTSFileExtension(name))
-                    .map(name => ({ name, size: host.getFileSize!(name) })) // TODO: GH#18217
-                    .sort((a, b) => b.size - a.size)
-                    .slice(0, 5);
-            }
         }
 
         private createExternalProject(projectFileName: string, files: protocol.ExternalFile[], options: protocol.ExternalProjectCompilerOptions, typeAcquisition: TypeAcquisition, excludedFiles: NormalizedPath[]) {
diff --git a/src/server/project.ts b/src/server/project.ts
index 7c95a633da..5d80bcf393 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -147,7 +147,8 @@ namespace ts.server {
         /*@internal*/
         private hasAddedorRemovedFiles = false;
 
-        private lastFileExceededProgramSize: string | undefined;
+        /*@internal*/
+        lastFileExceededProgramSize: string | undefined;
 
         // wrapper over the real language service that will suppress all semantic operations
         protected languageService: LanguageService;
diff --git a/src/testRunner/unittests/tsserver/events/projectLanguageServiceState.ts b/src/testRunner/unittests/tsserver/events/projectLanguageServiceState.ts
index da6718ef9c..d61b022ae9 100644
--- a/src/testRunner/unittests/tsserver/events/projectLanguageServiceState.ts
+++ b/src/testRunner/unittests/tsserver/events/projectLanguageServiceState.ts
@@ -7,7 +7,7 @@ namespace ts.projectSystem {
             };
             const f2 = {
                 path: "/a/largefile.js",
-                content: ""
+                content: "",
             };
             const config = {
                 path: "/a/jsconfig.json",
@@ -47,5 +47,39 @@ namespace ts.projectSystem {
             assert.equal(events[1].data.project.getProjectName(), config.path, "config path");
             assert.isTrue(events[1].data.languageServiceEnabled, "Language service state");
         });
+
+        it("Large file size is determined correctly", () => {
+            const f1: File = {
+                path: "/a/app.js",
+                content: "let x = 1;"
+            };
+            const f2: File = {
+                path: "/a/largefile.js",
+                content: "",
+                fileSize: server.maxProgramSizeForNonTsFiles + 1
+            };
+            const f3: File = {
+                path: "/a/extremlylarge.d.ts",
+                content: "",
+                fileSize: server.maxProgramSizeForNonTsFiles + 100
+            };
+            const config = {
+                path: "/a/jsconfig.json",
+                content: "{}"
+            };
+            const host = createServerHost([f1, f2, f3, libFile, config]);
+            const logs: string[] = [];
+            const logger: server.Logger = {
+                ...nullLogger,
+                info: s => logs.push(s)
+            };
+            const service = createProjectService(host, { logger });
+            service.openClientFile(f1.path);
+            checkNumberOfProjects(service, { configuredProjects: 1 });
+            const project = service.configuredProjects.get(config.path)!;
+            assert.isFalse(project.languageServiceEnabled, "Language service enabled");
+            assert.equal(project.lastFileExceededProgramSize, f2.path);
+            assert.isTrue(contains(logs, `Non TS file size exceeded limit (${f1.content.length + f2.fileSize!}). Largest files: ${f2.path}:${f2.fileSize}, ${f1.path}:${f1.content.length}`));
+        });
     });
 }
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index be9c82b1e1..1598efef32 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -9267,7 +9267,6 @@ declare namespace ts.server {
         private missingFilesMap;
         private generatedFilesMap;
         private plugins;
-        private lastFileExceededProgramSize;
         protected languageService: LanguageService;
         languageServiceEnabled: boolean;
         readonly trace?: (s: string) => void;