fix: ActionSelector type takes Source and Target

Author: emyann

src/types.ts

@@ -38,7 +38,7 @@ export type StrictSchema<Target = any, Source = any> = {
     | ActionString<Source>
     | ActionFunction<Target, Source, Target[destinationProperty]>
     | ActionAggregator<Source>
-    | ActionSelector<Source, Target[destinationProperty]>
+    | ActionSelector<Source, Target>
     | StrictSchema<Target[destinationProperty], Source>
 } & { [SCHEMA_OPTIONS_SYMBOL]?: SchemaOptions<Target> };
 export type Schema<Target = any, Source = any> = {
@@ -47,7 +47,7 @@ export type Schema<Target = any, Source = any> = {
     | ActionString<Source>
     | ActionFunction<Target, Source, Target[destinationProperty]>
     | ActionAggregator<Source>
-    | ActionSelector<Source, Target[destinationProperty]>
+    | ActionSelector<Source, Target>
     | Schema<Target[destinationProperty], Source>
 } & { [SCHEMA_OPTIONS_SYMBOL]?: SchemaOptions<Target | any> };
 
@@ -110,7 +110,7 @@ export interface ActionFunction<D = any, S = any, R = any> {
  * ```
  *
  */
-export type ActionString<Source> = string; // TODO: ActionString should support string and string[] for deep properties
+export type ActionString<Source> = string | keyof Source; // TODO: ActionString should support string and string[] for deep properties
 
 /**
  * An Array of String that allows to perform a function over source property
@@ -158,10 +158,9 @@ export type ActionAggregator<T extends unknown = unknown> = T extends object ? (
  *```
  *
  */
-export interface ActionSelector<Source = object, R = any> {
+export interface ActionSelector<Source = object, Target = any> {
   path?: ActionString<Source> | ActionAggregator<Source>;
-  // | ((source: Source) => unknown);
-  fn?: (fieldValue: any, object: Source, items: Source, objectToCompute: R) => R;
+  fn?: (fieldValue: any, object: Source, items: Source, objectToCompute: Target) => Target;
   validation?: BaseValidator<ReturnType<undefined extends ActionSelector['fn'] ? any : ActionSelector['fn']>>;
 }