fix(types): don't allow undefined results for stateful actions

Author: TheEdoRan

package.json

@@ -11,7 +11,8 @@
 		"test:lib": "turbo run test --filter=next-safe-action",
 		"lint:lib": "turbo run lint --filter=next-safe-action",
 		"build:lib": "turbo run build --filter=next-safe-action --force",
-		"deploy:lib": "turbo run deploy --filter=next-safe-action"
+		"deploy:lib": "turbo run deploy --filter=next-safe-action",
+		"build:pg": "turbo run build --filter=@apps/playground --force"
 	},
 	"author": "Edoardo Ranghieri",
 	"license": "MIT",

packages/next-safe-action/src/hooks.types.ts

@@ -53,7 +53,7 @@ export type HookSafeActionFn<
 	Data,
 > = (
 	input: S extends Schema ? InferIn<S> : undefined
-) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data>>;
+) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data> | undefined>;
 
 /**
  * Type of the stateful safe action function passed to hooks. Same as `SafeStateActionFn` except it accepts

packages/next-safe-action/src/index.types.ts

@@ -64,7 +64,7 @@ export type SafeStateActionFn<
 		prevResult: Prettify<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data>>,
 		input: S extends Schema ? InferIn<S> : void,
 	]
-) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data> | undefined>;
+) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data>>;
 
 /**
  * Type of the result of a middleware function. It extends the result of a safe action with

website/docs/types.md

@@ -89,7 +89,7 @@ export type SafeStateActionFn<
     prevResult: Prettify<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data>>,
     input: S extends Schema ? InferIn<S> : void,
   ]
-) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data> | undefined>;
+) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data>>;
 ```
 
 ### `MiddlewareResult`
@@ -327,7 +327,7 @@ export type HookSafeActionFn<
   Data,
 > = (
   input: S extends Schema ? InferIn<S> : undefined
-) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data>>;
+) => Promise<SafeActionResult<ServerError, S, BAS, CVE, CBAVE, Data> | undefined>;
 ```
 
 ### `HookSafeStateActionFn`