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

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import { Record } from 'immutable';
import type { Action } from 'redux';
import { NOTIFICATIONS_UPDATE } from '../actions/notifications';
import { focusApp, unfocusApp } from '../actions/app';
type MissedUpdatesState = {
focused: boolean;
unread: number;
};
const initialState = Record<MissedUpdatesState>({
focused: true,
unread: 0,
})();
export default function missed_updates(
state = initialState,
action: Action<string>,
) {
switch (action.type) {
case focusApp.type:
return state.set('focused', true).set('unread', 0);
case unfocusApp.type:
return state.set('focused', false);
case NOTIFICATIONS_UPDATE:
return state.get('focused')
? state
: state.update('unread', (x) => x + 1);
default:
return state;
}
}