Function useRoleMemberCountsForCommunity

lib/shared/thread-utils.js:1547–1576

(
  threadInfo: ThreadInfo,
)

};

function useRoleMemberCountsForCommunity(
  threadInfo: ThreadInfo,
): RoleAndMemberCount {
  return React.useMemo(() => {
    const roleIDsToNames: { [string]: string } = {};

    Object.keys(threadInfo.roles).forEach(roleID => {
      roleIDsToNames[roleID] = threadInfo.roles[roleID].name;
    });

    const roleNamesToMemberCount: RoleAndMemberCount = {};

    threadInfo.members.forEach(({ role: roleID }) => {
      invariant(roleID, 'Community member should have a role');
      const roleName = roleIDsToNames[roleID];

      roleNamesToMemberCount[roleName] =
        (roleNamesToMemberCount[roleName] ?? 0) + 1;
    });

    // For all community roles with no members, add them to the list with 0
    Object.keys(roleIDsToNames).forEach(roleName => {
      if (roleNamesToMemberCount[roleIDsToNames[roleName]] === undefined) {
        roleNamesToMemberCount[roleIDsToNames[roleName]] = 0;
      }
    });

    return roleNamesToMemberCount;
  }, [threadInfo.members, threadInfo.roles]);
}

function useRoleNamesToSpecialRole(threadInfo: ThreadInfo): {
  +[roleName: string]: ?SpecialRole,