diff --git a/app/src/data/fields/Field.ts b/app/src/data/fields/Field.ts
index b5e332d..5260d61 100644
--- a/app/src/data/fields/Field.ts
+++ b/app/src/data/fields/Field.ts
@@ -236,8 +236,8 @@ export abstract class Field<
 
    toJSON() {
       return {
-         //name: this.name,
-         type: this.type,
+         // @todo: current workaround because of fixed string type
+         type: this.type as any,
          config: this.config
       };
    }
diff --git a/app/src/modules/ModuleManager.ts b/app/src/modules/ModuleManager.ts
index f0c4013..e43dfa7 100644
--- a/app/src/modules/ModuleManager.ts
+++ b/app/src/modules/ModuleManager.ts
@@ -56,12 +56,13 @@ export type ModuleSchemas = {
 export type ModuleConfigs = {
    [K in keyof ModuleSchemas]: Static<ModuleSchemas[K]>;
 };
+type PartialRec<T> = { [P in keyof T]?: PartialRec<T[P]> };
 
 export type InitialModuleConfigs =
    | ({
         version: number;
      } & ModuleConfigs)
-   | Partial<ModuleConfigs>;
+   | PartialRec<ModuleConfigs>;
 
 export type ModuleManagerOptions = {
    initial?: InitialModuleConfigs;