diff --git a/src/checker/runtime.ts b/src/checker/runtime.ts
index 8bb3c10..543d600 100644
--- a/src/checker/runtime.ts
+++ b/src/checker/runtime.ts
@@ -267,13 +267,13 @@ function createChecker(receive: (cb: (msg: Req) => void) => void, send: (msg: Re
         directoryExists(path: string) {
             return compiler.sys.directoryExists(path);
         }
-
     }
 
     function processInit({ seq, payload }: Init.Request) {
         compiler = require(payload.compilerInfo.compilerPath);
         compilerInfo = payload.compilerInfo;
         loaderConfig = payload.loaderConfig;
+
         compilerConfig = payload.compilerConfig;
         compilerOptions = compilerConfig.options;
         webpackOptions = payload.webpackOptions;
@@ -300,6 +300,12 @@ function createChecker(receive: (cb: (msg: Req) => void) => void, send: (msg: Re
         });
 
         const program = service.getProgram();
+        if (loaderConfig.getCustomTransformers !== undefined) {
+            host.getCustomTransformers = loaderConfig.getCustomTransformers(program);
+        } else if (loaderConfig.customTranformersPath !== undefined) {
+            host.getCustomTransformers = require(loaderConfig.customTranformersPath)(program);
+        }
+
         program.getSourceFiles().forEach(file => {
             files.set(file.fileName, {
                 fileName: file.fileName,
diff --git a/src/interfaces.ts b/src/interfaces.ts
index 511db6d..75ef8ea 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -24,9 +24,10 @@ export interface LoaderConfig {
     cacheDirectory?: string;
     entryFileIsJs?: boolean;
     debug?: boolean;
+    customTranformersPath?: string;
+    getCustomTransformers?: (program: ts.Program) => ts.CustomTransformers | undefined;
     reportFiles?: string[];
     context?: string;
-    getCustomTransformers?(): ts.CustomTransformers | undefined;
 }
 
 export interface OutputFile {