From fdb3b6857d0f03693d53868c8a7752ce2801ea7a Mon Sep 17 00:00:00 2001
From: Vladimir Matveev <vladima@microsoft.com>
Date: Thu, 27 Oct 2016 14:52:09 -0700
Subject: [PATCH] enable non-ts extensions in inferred projects by default

---
 src/harness/unittests/session.ts              |  3 +-
 .../unittests/tsserverProjectSystem.ts        | 34 +++++++++++++++++++
 src/server/editorServices.ts                  |  3 ++
 3 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/harness/unittests/session.ts b/src/harness/unittests/session.ts
index dd9efe51a4a..05f62c4b9f6 100644
--- a/src/harness/unittests/session.ts
+++ b/src/harness/unittests/session.ts
@@ -150,7 +150,8 @@ namespace ts.server {
                         target: ScriptTarget.ES5,
                         jsx: JsxEmit.React,
                         newLine: NewLineKind.LineFeed,
-                        moduleResolution: ModuleResolutionKind.NodeJs
+                        moduleResolution: ModuleResolutionKind.NodeJs,
+                        allowNonTsExtensions: true // injected by tsserver
                     });
             });
         });
diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index 5ac18921578..870926a8c55 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -2471,4 +2471,38 @@ namespace ts.projectSystem {
 
         });
     });
+
+    describe("Inferred projects", () => {
+        it("should support files without extensions", () => {
+            const f = {
+                path: "/a/compile",
+                content: "let x = 1"
+            };
+            const host = createServerHost([f]);
+            const session = createSession(host);
+            session.executeCommand(<server.protocol.SetCompilerOptionsForInferredProjectsRequest>{
+                seq: 1,
+                type: "request",
+                command: "compilerOptionsForInferredProjects",
+                arguments: {
+                    options: {
+                        allowJs: true
+                    }
+                }
+            });
+            session.executeCommand(<server.protocol.OpenRequest>{
+                seq: 2,
+                type: "request",
+                command: "open",
+                arguments: {
+                    file: f.path,
+                    fileContent: f.content,
+                    scriptKindName: "JS"
+                }
+            });
+            const projectService = session.getProjectService();
+            checkNumberOfProjects(projectService, { inferredProjects: 1 });
+            checkProjectActualFiles(projectService.inferredProjects[0], [f.path]);
+        });
+    });
 }
\ No newline at end of file
diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index f80305efafa..a02becd87c4 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -298,6 +298,9 @@ namespace ts.server {
 
         setCompilerOptionsForInferredProjects(projectCompilerOptions: protocol.ExternalProjectCompilerOptions): void {
             this.compilerOptionsForInferredProjects = convertCompilerOptions(projectCompilerOptions);
+            // always set 'allowNonTsExtensions' for inferred projects since user cannot configure it from the outside
+            // previously we did not expose a way for user to change these settings and this option was enabled by default
+            this.compilerOptionsForInferredProjects.allowNonTsExtensions = true;
             this.compileOnSaveForInferredProjects = projectCompilerOptions.compileOnSave;
             for (const proj of this.inferredProjects) {
                 proj.setCompilerOptions(this.compilerOptionsForInferredProjects);