catstodon/app/javascript/mastodon/reducers/missed_updates.js

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import { Map as ImmutableMap } from 'immutable';
import { NOTIFICATIONS_UPDATE } from 'mastodon/actions/notifications';
import { APP_FOCUS, APP_UNFOCUS } from 'mastodon/actions/app';
const initialState = ImmutableMap({
focused: true,
unread: 0,
});
export default function missed_updates(state = initialState, action) {
switch(action.type) {
case APP_FOCUS:
return state.set('focused', true).set('unread', 0);
case APP_UNFOCUS:
return state.set('focused', false);
case NOTIFICATIONS_UPDATE:
return state.get('focused') ? state : state.update('unread', x => x + 1);
default:
return state;
}
};