feat: adds unsubscribe return function from mockConfig

Author: joelgallant

app-config/src/index.ts

@@ -129,7 +129,12 @@ export function resetConfigInternal() {
 /**
  * Overrides the configuration internally, setting it to the provided override.
  */
-export function mockConfig(override: ExportedConfig) {
+export function mockConfig(override: ExportedConfig): () => void {
   loadedConfig = override;
   isMocked = true;
+
+  return () => {
+    loadedConfig = undefined;
+    isMocked = false;
+  };
 }

docs/faq.md

@@ -53,4 +53,6 @@ File a GitHub issue on our repository, and we'll see if we can officially suppor
 ::: details Answer
 The App Config module exports an `mockConfig(override)` function. It allows you to
 internally set configuration without loading from files / the environment.
+
+It returns a function to un-mock.
 :::