Throw error when called hook without provider (cerebral#354)

Throw error when called hook without provider

Author: christianalfoni

packages/node_modules/overmind-react/src/index.test.tsx

@@ -367,4 +367,35 @@ describe('React', () => {
     expect(renderCount).toBe(1)
     expect(tree).toMatchSnapshot()
   })
+  test('should throw an error without provider', () => {
+    expect.assertions(1)
+
+    const config = {
+      state: {
+        foo: 'bar',
+      },
+    }
+
+    type IConfig = {
+      state: {
+        foo: typeof config.state.foo
+      }
+    }
+
+    const useApp = createHook<IConfig>();
+
+    const FooComponent = () => {
+      const { state } = useApp();
+
+      return <h1>{state.foo}</h1>
+    }
+
+    expect(() => {
+      renderer
+        .create(
+          <FooComponent />
+        )
+        .toJSON()
+    }).toThrow(Error)
+  })
 })

packages/node_modules/overmind-react/src/index.ts

@@ -97,7 +97,7 @@ export const createHook = <Config extends IConfiguration>(): (() => {
   return () => {
     const overmind = react.useContext(context) as Overmind<Config>
 
-    if (!overmind) {
+    if (!(overmind as any).mode) {
       throwMissingContextError()
     }