From 66de140423bb0abe78290af4535bf18ed8579e4c Mon Sep 17 00:00:00 2001
From: Kim Ode <kimgronqvist@gmail.com>
Date: Tue, 6 Feb 2024 02:29:35 +0100
Subject: [PATCH] Fix missing fail import (#2137)

* Fix missing fail import

* Add test case for incorrect processor

* Only run test in dev
---
 __tests__/core/snapshotProcessor.test.ts     | 12 ++++++++++++
 src/types/utility-types/snapshotProcessor.ts |  3 ++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/__tests__/core/snapshotProcessor.test.ts b/__tests__/core/snapshotProcessor.test.ts
index 96b1d30ff..2b427852f 100644
--- a/__tests__/core/snapshotProcessor.test.ts
+++ b/__tests__/core/snapshotProcessor.test.ts
@@ -843,4 +843,16 @@ describe("snapshotProcessor", () => {
     expect(() => store.setProp("b")).not.toThrow()
     expect(store.prop).toBe("b")
   })
+
+  if (process.env.NODE_ENV !== "production") {
+    test("it should fail if given incorrect processor", () => {
+      expect(() => {
+        types.model({
+          m: types.snapshotProcessor(types.number, {
+            postProcessor: {} as any
+          })
+        })
+      }).toThrowError("[mobx-state-tree] postSnapshotProcessor must be a function")
+    })
+  }
 })
diff --git a/src/types/utility-types/snapshotProcessor.ts b/src/types/utility-types/snapshotProcessor.ts
index ac0d16566..0712bbc1b 100644
--- a/src/types/utility-types/snapshotProcessor.ts
+++ b/src/types/utility-types/snapshotProcessor.ts
@@ -16,7 +16,8 @@ import {
   typeCheckFailure,
   isUnionType,
   Instance,
-  ObjectNode
+  ObjectNode,
+  fail
 } from "../../internal"
 
 /** @hidden */