diff --git a/src/compiler/watch.ts b/src/compiler/watch.ts
index 7965af051cc..703b5b42cc6 100644
--- a/src/compiler/watch.ts
+++ b/src/compiler/watch.ts
@@ -426,6 +426,20 @@ namespace ts {
         updateRootFileNames(fileNames: string[]): void;
     }
 
+    /**
+     * Create the watch compiler host for either configFile or fileNames and its options
+     */
+    export function createWatchCompilerHost(rootFiles: string[], options: CompilerOptions, system: System, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions;
+    export function createWatchCompilerHost(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile;
+    export function createWatchCompilerHost(rootFilesOrConfigFileName: string | string[], options: CompilerOptions | undefined, system: System, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions | WatchCompilerHostOfConfigFile {
+        if (isArray(rootFilesOrConfigFileName)) {
+            return createWatchCompilerHostOfFilesAndCompilerOptions(rootFilesOrConfigFileName, options, system, reportDiagnostic, reportWatchStatus);
+        }
+        else {
+            return createWatchCompilerHostOfConfigFile(rootFilesOrConfigFileName, options, system, reportDiagnostic, reportWatchStatus);
+        }
+    }
+
     /**
      * Creates the watch from the host for root files and compiler options
      */
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index c64b02bebcb..e74dd31dc8d 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -4068,6 +4068,11 @@ declare namespace ts {
         /** Updates the root files in the program, only if this is not config file compilation */
         updateRootFileNames(fileNames: string[]): void;
     }
+    /**
+     * Create the watch compiler host for either configFile or fileNames and its options
+     */
+    function createWatchCompilerHost(rootFiles: string[], options: CompilerOptions, system: System, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfFilesAndCompilerOptions;
+    function createWatchCompilerHost(configFileName: string, optionsToExtend: CompilerOptions | undefined, system: System, reportDiagnostic?: DiagnosticReporter, reportWatchStatus?: WatchStatusReporter): WatchCompilerHostOfConfigFile;
     /**
      * Creates the watch from the host for root files and compiler options
      */