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src/server/client.ts

@@ -175,7 +175,7 @@ module ts.server {
         getProjectInfo(fileName: string, needFileNameList: boolean): protocol.ProjectInfo {
             var args: protocol.ProjectInfoRequestArgs = {
                 file: fileName,
-                needFileNameList: !!needFileNameList
+                needFileNameList: needFileNameList
             };
 
             var request = this.processRequest<protocol.ProjectInfoRequest>(CommandNames.ProjectInfo, args);

src/server/protocol.d.ts

@@ -88,7 +88,7 @@ declare module ts.server.protocol {
     }
 
     /** 
-      * Arguments for ProjectInfoResponse messages.
+      * Arguments for ProjectInfoRequest request.
       */
     export interface ProjectInfoRequestArgs extends FileRequestArgs {
         /**
@@ -97,18 +97,31 @@ declare module ts.server.protocol {
         needFileNameList: boolean;
     }
 
+    /**
+      * A request to get the project information of the current file
+      */
     export interface ProjectInfoRequest extends Request {
         arguments: ProjectInfoRequestArgs
     }
 
     /** 
-      * Response message for "projectInfo" request
+      * Response message body for "projectInfo" request
       */
     export interface ProjectInfo {
+        /**
+          * For configured project, this is the normalized path of the 'tsconfig.json' file
+          * For inferred project, this is undefined
+          */
         configFileName: string;
+        /**
+          * The list of normalized file name in the project, including 'lib.d.ts'
+          */
         fileNameList?: string[];
     }
 
+    /** 
+      * Response message for "projectInfo" request
+      */
     export interface ProjectInfoResponse extends Response {
         body?: ProjectInfo;
     }