signal-desktop/ts/state/selectors/accounts.ts

// Copyright 2019-2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import { createSelector } from 'reselect';

import type { StateType } from '../reducer';
import type { AccountsStateType } from '../ducks/accounts';
import type { UUIDStringType } from '../../types/UUID';

export const getAccounts = (state: StateType): AccountsStateType =>
  state.accounts;

export type AccountSelectorType = (
  identifier?: string
) => UUIDStringType | undefined;
export const getAccountSelector = createSelector(
  getAccounts,
  (accounts: AccountsStateType): AccountSelectorType => {
    return (identifier?: string) => {
      if (!identifier) {
        return undefined;
      }

      return accounts.accounts[identifier] || undefined;
    };
  }
);