Allow any string value in meta

Author: abrgr

.changeset/tasty-guests-cry.md

@@ -0,0 +1,5 @@
+---
+'@xstate/machine-extractor': minor
+---
+
+Capture any string field from meta instead of just description

packages/machine-extractor/examples/meta.ts

@@ -0,0 +1,8 @@
+import { createMachine } from 'xstate';
+
+export const machine = createMachine({
+  meta: {
+    description: 'description',
+    someOtherField: 'hello there',
+  },
+});

packages/machine-extractor/src/meta.ts

@@ -1,9 +1,7 @@
 import { StringLiteral, TemplateLiteral } from './scalars';
 import { unionType } from './unionType';
-import { objectTypeWithKnownKeys } from './utils';
+import { objectOf } from './utils';
 
-export const MetaDescription = unionType([StringLiteral, TemplateLiteral]);
+export const MetaValues = unionType([StringLiteral, TemplateLiteral]);
 
-export const StateMeta = objectTypeWithKnownKeys({
-  description: MetaDescription,
-});
+export const StateMeta = objectOf(MetaValues);

packages/machine-extractor/src/toMachineConfig.ts

@@ -101,10 +101,14 @@ const parseStateNode = (
     config.always = getTransitions(astResult.always, opts);
   }
 
-  if (astResult.meta?.description) {
-    config.meta = {
-      description: astResult.meta.description.value,
-    };
+  if (astResult.meta) {
+    config.meta = astResult.meta.properties.reduce(
+      (meta, props) => ({
+        ...meta,
+        [props.key]: props.result.value,
+      }),
+      {},
+    );
   }
 
   if (astResult.onDone) {