Javascript import handle undefined

Question

Is it possible to catch typos like in switch case example statement below?

Preferred way would be that eslinter report an warning/error. Currently adding toString() to const can be used to raise an TypeError in runtime if undefined.

actionTypes.js

export const UPDATE_REQUEST = 'UPDATE_REQUEST';

reducer.js

import * as types from '../constants/actionTypes';

export default function pouchdbReducer(state = {}, action) {
  switch (action.type) {
    case types.UPDDATE_REQUEST:
      // there is a typo above and it evaluates to `undefined`
      // this code would never be reached - how to make it an error
      return Object.assign({}, state, {updated: true});
    default:
      return state;
  }
}

UPDATE:

As @nikc.org answered eslint-plugin-import with namespace option can be used for linting such bugs.

Here is small repository with configuration and demo:

https://github.com/bmihelac/test-js-import-undefined/tree/eslint-plugin-import

Relevant part of eslint config is:

"plugins": ["import"],
"rules": {
  "import/namespace": [2],

Answer 1

Disclaimer, I'm the autor of tern-lint.

I suggest you that you use tern-lint which is able to report errors like "Unknown property".

You can use this linter with command or with an editor which supports it (Emacs, Atom, CodeMirror or Eclipse). Here a screenshot with Eclipse tern.java