grafana/public/app/features/explore/state/selectors.ts

import { createSelector } from '@reduxjs/toolkit';

import { ExploreItemState, StoreState } from 'app/types';

export const selectPanes = (state: Pick<StoreState, 'explore'>) => state.explore.panes;
export const selectExploreRoot = (state: Pick<StoreState, 'explore'>) => state.explore;

export const selectPanesEntries = createSelector<
  [(state: Pick<StoreState, 'explore'>) => Record<string, ExploreItemState | undefined>],
  Array<[string, ExploreItemState]>
>(selectPanes, Object.entries);

export const isSplit = createSelector(selectPanesEntries, (panes) => panes.length > 1);
export const selectIsHelperShowing = createSelector(selectPanesEntries, (panes) =>
  panes.some((pane) => pane[1].correlationEditorHelperData !== undefined)
);

export const isLeftPaneSelector = (exploreId: string) =>
  createSelector(selectPanes, (panes) => {
    return Object.keys(panes)[0] === exploreId;
  });

export const getExploreItemSelector = (exploreId: string) => createSelector(selectPanes, (panes) => panes[exploreId]);

export const selectCorrelationDetails = createSelector(selectExploreRoot, (state) => state.correlationEditorDetails);