diff --git a/src/configs/app.ts b/src/configs/app.ts
index 03017c7..ca49fd1 100644
--- a/src/configs/app.ts
+++ b/src/configs/app.ts
@@ -2,12 +2,13 @@ import RedmineIssueEventEmitterConfigLoader from '@app/event-emitter/configs/mai
 import { readFileSync } from 'fs';
 import { join } from 'path';
 import { parse } from 'jsonc-parser';
+import { AppConfig } from 'src/models/app-config.model';
 
 const redmineIssueEventEmitterConfig = RedmineIssueEventEmitterConfigLoader();
 
-let appConfig;
+let appConfig: AppConfig;
 
-export default () => {
+export default (): AppConfig => {
   if (appConfig) {
     return appConfig;
   }
diff --git a/src/models/app-config.model.ts b/src/models/app-config.model.ts
new file mode 100644
index 0000000..e0a9fb1
--- /dev/null
+++ b/src/models/app-config.model.ts
@@ -0,0 +1,10 @@
+import { MainConfigModel } from '@app/event-emitter/models/main-config-model';
+
+export type AppConfig = {
+  redmineIssueEventEmitterConfig: MainConfigModel;
+  couchDb: {
+    dbs: {
+      changes: string;
+    };
+  };
+};