Added t() to allow for simpler use of schema

.changeset/serious-snails-heal.md

@@ -0,0 +1,16 @@
+---
+'xstate': patch
+---
+
+Added `t()`, which can be used to provide types for `schema` attributes in machine configs:
+
+```ts
+import { t, createMachine } from 'xstate';
+
+const machine = createMachine({
+  schema: {
+    context: t<{ value: number }>(),
+    events: t<{ type: 'EVENT_1' } | { type: 'EVENT_2' }>()
+  }
+});
+```

packages/core/src/index.ts

@@ -31,7 +31,7 @@ import {
   InterpreterStatus
 } from './interpreter';
 import { matchState } from './match';
-import { createSchema } from './schema';
+import { createSchema, t } from './schema';
 
 const actions = {
   raise,
@@ -73,7 +73,8 @@ export {
   spawn,
   doneInvoke,
   createMachine,
-  createSchema
+  createSchema,
+  t
 };
 
 export * from './types';

packages/core/src/schema.ts

@@ -1,3 +1,4 @@
 export function createSchema<T>(schema?: any): T {
   return schema as T;
 }
+export const t = createSchema;