Async await – Babel eslint: typeerror: cannot read null property ‘range’
I use Babel eslint to decorate / fix my code It worked well until I wanted to use some es2017 async waiting to find over here
I changed my react application accordingly, although there are some differences:
My index Relevant parts of JS:
async function renderApp() { const store = await configureStore() const history = syncHistoryWithStore(browserHistory,store,{ selectLocationState: state => state.get('routing') }) ReactDOM.render( <AppContainer> <MuiThemeProvider muiTheme={muiTheme}> <Provider store={store}> <Router history={history} routes={routes(store)} /> </Provider> </MuiThemeProvider> </AppContainer>,document.getElementById('root') ) } renderApp()
My store:
// @flow import 'babel-polyfill' import { addFormSubmitSagaTo } from 'redux-form-submit-saga/es/immutable' import { applyMiddleware,createStore,compose } from 'redux' import { autoRehydrate,persistStore } from 'redux-persist-immutable' import { browserHistory } from 'react-router' import { combineReducers } from 'redux-immutable' import { fromJS } from 'immutable' import { routerMiddleware } from 'react-router-redux' import createSagaMiddleware from 'redux-saga' import rootReducer from './rootReducer' import sagas from './rootSaga' export default function configureStore() { return new Promise((resolve,reject) => { try { const sagaMiddleware = createSagaMiddleware() const middleware = [ routerMiddleware(browserHistory),sagaMiddleware ] const enhancer = compose( autoRehydrate(),applyMiddleware(...middleware) ) const store = createStore( combineReducers(rootReducer),undefined,enhancer ) // Decorate with Redux Form Submit Saga // and create hook for saga's const rootSaga = addFormSubmitSagaTo(sagas) sagaMiddleware.run(rootSaga) // Persist store to the local storage persistStore( store,{ whitelist: ['auth','timezone'] },() => resolve(store) ) } catch (e) { reject(e) } }) }
This is mine. eslintrc:
{ "env": { "browser": true,"jest/globals": true },"extends": [ "standard","standard-flow","plugin:react/recommended" ],"plugins": [ "compat","jest","react" ],"parserOptions": { "ecmaVersion": 2017,"sourceType": "module","ecmaFeatures": { "jsx": true } },"rules": { "comma-dangle": ["warn","only-multiline"],"compat/compat": 2,"jest/no-disabled-tests": "warn","jest/no-focused-tests": "error","jest/no-identical-title": "error","max-len": ["warn",80],"no-debugger": 0,"react/jsx-uses-vars": [2] } }
This is mine. babelrc:
{ "plugins": [ "react-hot-loader/babel","Syntax-flow","tcomb","transform-class-properties" ],"presets": [ "es2015","react",["env",{ "targets": { "browsers": ["last 2 versions"] } }] ] }
But no matter what I do: I keep getting the following errors:
Module build Failed: TypeError: Cannot read property 'range' of null at TokenStore.getTokenBefore (/Users/danielterwiel/dev/nimbus/node_modules/eslint/lib/token-store/index.js:318:17) at EventEmitter.checkFunction (/Users/danielterwiel/dev/nimbus/node_modules/eslint/lib/rules/generator-star-spacing.js:131:42) at emitOne (events.js:101:20) at EventEmitter.emit (events.js:191:7) at NodeEventGenerator.enterNode (/Users/danielterwiel/dev/nimbus/node_modules/eslint/lib/util/node-event-generator.js:39:22) at CodePathAnalyzer.enterNode (/Users/danielterwiel/dev/nimbus/node_modules/eslint/lib/code-path-analysis/code-path-analyzer.js:607:23) at CommentEventGenerator.enterNode (/Users/danielterwiel/dev/nimbus/node_modules/eslint/lib/util/comment-event-generator.js:98:23) at Controller.enter (/Users/danielterwiel/dev/nimbus/node_modules/eslint/lib/eslint.js:928:36) at Controller.__execute (/Users/danielterwiel/dev/nimbus/node_modules/estraverse/estraverse.js:397:31) at Controller.traverse (/Users/danielterwiel/dev/nimbus/node_modules/estraverse/estraverse.js:501:28) @ multi react-hot-loader/patch webpack-hot-middleware/client babel-polyfill ./src/index.js ./src/style/main.css
I'm not quite sure what to do I have encountered similar problems in multiple posts, but until now, these have not been answered
Solution
Previously, eslint supported es2017 asynchronous / wait itself. Babel and eslint were listed in Babel- eslint@7.0.0. Workarounds that were removed you should upgrade to V7 all day - eslint or, if you can't do this, use eslint plug-in - Babel's patched generator star spacing rule