diff --git a/BuildServer/lib/task-processor.ts b/BuildServer/lib/task-processor.ts
index d107408..8623e9c 100644
--- a/BuildServer/lib/task-processor.ts
+++ b/BuildServer/lib/task-processor.ts
@@ -1,12 +1,14 @@
 "use strict";
 
 import tasks from "./tasks";
-import { Messages, MessagesRoot, ProcessTaskContext, ReportResult, Settings, TaskInfo, TaskProcessor, TaskProcessorCallback, TaskProcessorCore } from "./types";
+import { Messages, MessagesRoot, ProcessTaskContext, ReportResult, Settings, TaskInfo, TaskInfoExternal, TaskProcessor, TaskProcessorCallback, TaskProcessorCore } from "./types";
 
 interface IFlags {
     [flagName: string]: boolean;
 }
 
+const isExternalTask = (task: TaskInfo): task is TaskInfoExternal => (task as TaskInfoExternal).type !== undefined;
+
 // TaskProcessor does not look like EventEmitter, so no need to extend EventEmitter and use `emit' here.
 const createTaskProcessor = (task: TaskInfo, outerProcessor: TaskProcessorCore, callback: TaskProcessorCallback) => {
     const errors: string[] = [];
@@ -31,7 +33,7 @@ const createTaskProcessor = (task: TaskInfo, outerProcessor: TaskProcessorCore,
         onError,
         onWarn,
         onInfo,
-        process: () => tasks[task.type](task.params || {}, result)(),
+        process: () => (isExternalTask(task) ? tasks[task.type](task.params || {}, result) : task.task)(),
         processTask: (innerTask, innerCallback) => createTaskProcessor(innerTask, result, innerCallback).process(),
         settings: outerProcessor.settings,
     };
diff --git a/BuildServer/lib/types/index.ts b/BuildServer/lib/types/index.ts
index dccc68b..1ded103 100644
--- a/BuildServer/lib/types/index.ts
+++ b/BuildServer/lib/types/index.ts
@@ -22,7 +22,9 @@ export type Settings = SettingsTypes.Settings;
 export type ProcessTaskContext = TaskProcessorTypes.IProcessTaskContext;
 export type GenericTask<TParams> = TaskProcessorTypes.GenericTask<TParams>;
 export type Task = TaskProcessorTypes.Task;
-export type TaskInfo = TaskProcessorTypes.ITaskInfo;
+export type TaskInfo = TaskProcessorTypes.TaskInfo;
+export type TaskInfoExternal = TaskProcessorTypes.ITaskInfoExternal;
+export type TaskInfoInternal = TaskProcessorTypes.ITaskInfoInternal;
 export type TaskProcessor = TaskProcessorTypes.ITaskProcessor;
 export type TaskProcessorCallback = TaskProcessorTypes.TaskProcessorCallback;
 export type TaskProcessorCore = TaskProcessorTypes.ITaskProcessorCore;
diff --git a/BuildServer/lib/types/task-processor-types.ts b/BuildServer/lib/types/task-processor-types.ts
index 373d309..b1edc2d 100644
--- a/BuildServer/lib/types/task-processor-types.ts
+++ b/BuildServer/lib/types/task-processor-types.ts
@@ -27,7 +27,7 @@ export interface ITaskProcessorCore {
 
 export interface ITaskProcessor extends ITaskProcessorCore {
     readonly process: () => void;
-    readonly processTask: (task: ITaskInfo, innerCallback: TaskProcessorCallback) => void;
+    readonly processTask: (task: TaskInfo, innerCallback: TaskProcessorCallback) => void;
     readonly done: () => void;
 }
 
@@ -35,16 +35,25 @@ interface ITaskParameters {
     readonly [paramName: string]: any;
 }
 
-export interface ITaskInfo {
-    readonly name?: string;
-    readonly type: string;
-    readonly params: ITaskParameters;
-}
+type TaskWithParameters = () => void;
 
-export type GenericTask<TParams> = (params: TParams, processor: ITaskProcessor) => () => void;
+export type GenericTask<TParams> = (params: TParams, processor: ITaskProcessor) => TaskWithParameters;
 
 export type Task = GenericTask<ITaskParameters>;
 
 export interface ITasks {
     readonly [taskName: string]: Task;
 }
+
+export interface ITaskInfoExternal {
+    readonly name?: string;
+    readonly type: string;
+    readonly params?: ITaskParameters;
+}
+
+export interface ITaskInfoInternal {
+    readonly name: string;
+    readonly task: TaskWithParameters;
+}
+
+export type TaskInfo = ITaskInfoExternal | ITaskInfoInternal;