Created
September 1, 2017 17:34
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Time travel debugging with Focal! (use Redux dev tools browser extension)
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| import { Atom } from '@grammarly/focal' | |
| import { createStore } from 'redux' | |
| declare global { | |
| interface Window { | |
| __REDUX_DEVTOOLS_EXTENSION__?: () => undefined | |
| } | |
| } | |
| /** | |
| * Call this on your root state atom to enable Redux dev tools debugging. | |
| * | |
| * For example: | |
| * const state = Atom.create(initialState) | |
| * createAtomStore(state) // <- this line enables redux devtools | |
| */ | |
| export function createAtomStore<TState>(atom: Atom<TState>) { | |
| const store = createStore( | |
| (_: TState, action: { type: '@@ATOM_UPDATE', newState: TState }) => { | |
| return action.newState | |
| }, | |
| atom.get(), | |
| window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__() | |
| ) | |
| let dispatch = true | |
| let setAtom = true | |
| const atomSub = atom.subscribe(x => { | |
| if (dispatch) { | |
| setAtom = false | |
| store.dispatch({ type: '@@ATOM_UPDATE', newState: x }) | |
| setAtom = true | |
| } | |
| }) | |
| const storeSub = store.subscribe(() => { | |
| if (setAtom) { | |
| dispatch = false | |
| // @TODO why do we get an undefined state here if you click commit right after | |
| // the store was initialized? | |
| atom.modify(x => store.getState() !== undefined ? store.getState() : x) | |
| dispatch = true | |
| } | |
| }) | |
| return { | |
| store, | |
| unsubscribe() { | |
| atomSub.unsubscribe() | |
| storeSub() | |
| } | |
| } | |
| } |
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