TypeError: Cannot read property ' __value' of undefined

Testing under jest, this line throws an error calling fromreact-navigation-drawer. This test executes via the mock as expected in version 1.4.0 and then it breaks in 1.5.0 and later.

https://github.com/software-mansion/react-native-reanimated/blob/33f827311f035eaed430d82b057edc6e00781ec7/mock.js#L26

    TypeError: Cannot read property ' __value' of undefined

      15 |   beforeEach(async () => {
      16 |     store = mockStore({ metricsState: initialMetricsState, preferencesState: initialPreferencesState });
    > 17 |     container = mount(
         |                 ^
      18 |       <Provider store={store}>
      19 |         <RootContainer />
      20 |       </Provider>,

      at getValue (node_modules/react-native-reanimated/mock.js:26:14)
      at getValue (node_modules/react-native-reanimated/mock.js:105:11)
      at new cond (node_modules/react-navigation-drawer/lib/commonjs/views/Drawer.tsx:325:9)
      at constructClassInstance (node_modules/react-dom/cjs/react-dom.development.js:14204:18)
      at updateClassComponent (node_modules/react-dom/cjs/react-dom.development.js:18413:5)
      at beginWork$1 (node_modules/react-dom/cjs/react-dom.development.js:20186:16)
      at HTMLUnknownElement.callCallback (node_modules/react-dom/cjs/react-dom.development.js:336:14)
      at Object.invokeGuardedCallbackDev (node_modules/react-dom/cjs/react-dom.development.js:385:16)
      at invokeGuardedCallback (node_modules/react-dom/cjs/react-dom.development.js:440:31)
      at beginWork$$1 (node_modules/react-dom/cjs/react-dom.development.js:25780:7)
      at performUnitOfWork (node_modules/react-dom/cjs/react-dom.development.js:24698:12)
      at workLoopSync (node_modules/react-dom/cjs/react-dom.development.js:24671:22)
      at performSyncWorkOnRoot (node_modules/react-dom/cjs/react-dom.development.js:24270:11)
      at scheduleUpdateOnFiber (node_modules/react-dom/cjs/react-dom.development.js:23698:7)
      at updateContainer (node_modules/react-dom/cjs/react-dom.development.js:27103:3)
      at node_modules/react-dom/cjs/react-dom.development.js:27528:7
      at unbatchedUpdates (node_modules/react-dom/cjs/react-dom.development.js:24433:12)
      at legacyRenderSubtreeIntoContainer (node_modules/react-dom/cjs/react-dom.development.js:27527:5)
      at Object.render (node_modules/react-dom/cjs/react-dom.development.js:27608:10)
      at render (node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:437:26)
      at fn (node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:354:37)
      at batchedUpdates$1 (node_modules/react-dom/cjs/react-dom.development.js:24386:12)
      at Object.act (node_modules/react-dom/cjs/react-dom-test-utils.development.js:1092:14)
      at act (node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:354:13)
      at Object.wrapAct [as render] (node_modules/enzyme-adapter-react-16/src/ReactSixteenAdapter.js:423:16)
      at new render (node_modules/enzyme/src/ReactWrapper.js:115:16)
      at mount (node_modules/enzyme/src/mount.js:10:10)
      at mount (__tests__/rootContainer.test.tsx:17:17)
      at tryCatch (node_modules/regenerator-runtime/runtime.js:45:40)
      at Generator.invoke [as _invoke] (node_modules/regenerator-runtime/runtime.js:271:22)
      at Generator.prototype.<computed> [as next] (node_modules/regenerator-runtime/runtime.js:97:21)
      at tryCatch (node_modules/regenerator-runtime/runtime.js:45:40)
      at invoke (node_modules/regenerator-runtime/runtime.js:135:20)
      at node_modules/regenerator-runtime/runtime.js:170:11
      at new Promise (node_modules/core-js/modules/es6.promise.js:177:7)
      at callInvokeWithMethodAndArg (node_modules/regenerator-runtime/runtime.js:169:16)
      at AsyncIterator.enqueue (node_modules/regenerator-runtime/runtime.js:192:13)
      at AsyncIterator.prototype.<computed> [as next] (node_modules/regenerator-runtime/runtime.js:97:21)
      at Object.<anonymous>.exports.async (node_modules/regenerator-runtime/runtime.js:216:14)
      at Object._callee (__tests__/rootContainer.test.tsx:15:14)

[jakub-gonet]

@GoMino, @GioCirque, thanks for reporting.

@Thomazella, thanks for the detailed description. I think NOOP returning 1 as __value isn’t right fix because we return 0 when starting or stopping the clock.

Can you guys check out if https://github.com/software-mansion/react-native-reanimated/commit/c9cabc468e8a94eb07c91cb2bcaa87dfb188d3fa commit improves the situation a bit?

[tcodes0]

This: https://github.com/software-mansion/react-native-reanimated/blob/79f31870b5f38d62ee56a5116dc0962381f86c61/mock.js#L138 has type: https://github.com/software-mansion/react-native-reanimated/blob/79f31870b5f38d62ee56a5116dc0962381f86c61/react-native-reanimated.d.ts#L285

but it’s being mocked as NOOP a function that returns void. https://github.com/software-mansion/react-native-reanimated/blob/79f31870b5f38d62ee56a5116dc0962381f86c61/mock.js#L14 Then the code complains __value is not there bc nothing was returned.

Not sure if best fix but see (actually probably best to change just cond to return an object) https://github.com/lucianomlima/react-navigation-v4-examples/pull/1

PS: key lines in stacktrace:

at getValue (node_modules/react-native-reanimated/mock.js:26:14)
      at getValue (node_modules/react-native-reanimated/mock.js:105:11)
      at new cond (node_modules/react-navigation-drawer/lib/commonjs/views/Drawer.tsx:325:9)