diff --git a/src/harness/unittests/textStorage.ts b/src/harness/unittests/textStorage.ts
index 71ce83d9ee714..b4287f2610c21 100644
--- a/src/harness/unittests/textStorage.ts
+++ b/src/harness/unittests/textStorage.ts
@@ -16,7 +16,6 @@ namespace ts.textStorage {
 
         it("text based storage should be have exactly the same as script version cache", () => {
 
-            debugger
             const host = ts.projectSystem.createServerHost([f]);
 
             const ts1 = new server.TextStorage(host, server.asNormalizedPath(f.path));
diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index fa4d65af4ab64..a69a226becfa2 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -140,7 +140,6 @@ namespace ts.projectSystem {
     export interface TestServerHostCreationParameters {
         useCaseSensitiveFileNames?: boolean;
         executingFilePath?: string;
-        libFile?: FileOrFolder;
         currentDirectory?: string;
     }
 
@@ -1145,6 +1144,69 @@ namespace ts.projectSystem {
             checkNumberOfProjects(projectService, {});
         });
 
+        it("reload regular file after closing", () => {
+            const f1 = {
+                path: "/a/b/app.ts",
+                content: "x."
+            };
+            const f2 = {
+                path: "/a/b/lib.ts",
+                content: "let x: number;"
+            };
+
+            const host = createServerHost([f1, f2, libFile]);
+            const service = createProjectService(host);
+            service.openExternalProject({ projectFileName: "/a/b/project", rootFiles: toExternalFiles([f1.path, f2.path]), options: {} })
+
+            service.openClientFile(f1.path);
+            service.openClientFile(f2.path, "let x: string");
+
+            service.checkNumberOfProjects({ externalProjects: 1 });
+            checkProjectActualFiles(service.externalProjects[0], [f1.path, f2.path, libFile.path]);
+
+            const completions1 = service.externalProjects[0].getLanguageService().getCompletionsAtPosition(f1.path, 2);
+            // should contain completions for string
+            assert.isTrue(completions1.entries.some(e => e.name === "charAt"), "should contain 'charAt'");
+            assert.isFalse(completions1.entries.some(e => e.name === "toExponential"), "should not contain 'toExponential'");
+
+            service.closeClientFile(f2.path);
+            const completions2 = service.externalProjects[0].getLanguageService().getCompletionsAtPosition(f1.path, 2);
+            // should contain completions for string
+            assert.isFalse(completions2.entries.some(e => e.name === "charAt"), "should not contain 'charAt'");
+            assert.isTrue(completions2.entries.some(e => e.name === "toExponential"), "should contain 'toExponential'");
+        });
+
+        it("clear mixed content file after closing", () => {
+            const f1 = {
+                path: "/a/b/app.ts",
+                content: " "
+            };
+            const f2 = {
+                path: "/a/b/lib.html",
+                content: "<html/>"
+            };
+
+            const host = createServerHost([f1, f2, libFile]);
+            const service = createProjectService(host);
+            service.openExternalProject({ projectFileName: "/a/b/project", rootFiles: [{ fileName: f1.path }, { fileName: f2.path, hasMixedContent: true }], options: {} })
+
+            service.openClientFile(f1.path);
+            service.openClientFile(f2.path, "let somelongname: string");
+
+            service.checkNumberOfProjects({ externalProjects: 1 });
+            checkProjectActualFiles(service.externalProjects[0], [f1.path, f2.path, libFile.path]);
+
+            const completions1 = service.externalProjects[0].getLanguageService().getCompletionsAtPosition(f1.path, 0);
+            assert.isTrue(completions1.entries.some(e => e.name === "somelongname"), "should contain 'somelongname'");
+
+            service.closeClientFile(f2.path);
+            const completions2 = service.externalProjects[0].getLanguageService().getCompletionsAtPosition(f1.path, 0);
+            assert.isFalse(completions2.entries.some(e => e.name === "somelongname"), "should not contain 'somelongname'");
+            const sf2 = service.externalProjects[0].getLanguageService().getProgram().getSourceFile(f2.path);
+            assert.equal(sf2.text, "");
+        });
+
+
         it("external project with included config file opened after configured project", () => {
             const file1 = {
                 path: "/a/b/f1.ts",
diff --git a/src/server/scriptInfo.ts b/src/server/scriptInfo.ts
index e8acb676f1b40..b8d22c5c56df8 100644
--- a/src/server/scriptInfo.ts
+++ b/src/server/scriptInfo.ts
@@ -28,9 +28,9 @@ namespace ts.server {
             this.switchToScriptVersionCache(newText);
         }
 
-        public useText() {
+        public useText(newText?: string) {
             this.svc = undefined;
-            this.reloadFromFile();
+            this.setText(newText);
         }
 
         public edit(start: number, end: number, newText: string) {
@@ -199,7 +199,8 @@ namespace ts.server {
 
         public close() {
             this.isOpen = false;
-            this.textStorage.useText();
+            this.textStorage.useText(this.hasMixedContent ? "" : undefined);
+            this.markContainingProjectsAsDirty();
         }
 
         public getSnapshot() {