def sync_matchers(saltenv=None, refresh=False, extmod_whitelist=None, extmod_blacklist=None):
    '''
    .. versionadded:: 2019.2.0

    Sync engine modules from ``salt://_matchers`` to the minion

    saltenv
        The fileserver environment from which to sync. To sync from more than
        one environment, pass a comma-separated list.

        If not passed, then all environments configured in the :ref:`top files
        <states-top>` will be checked for engines to sync. If no top files are
        found, then the ``base`` environment will be synced.

    refresh : True
        If ``True``, refresh the available execution modules on the minion.
        This refresh will be performed even if no new matcher modules are synced.
        Set to ``False`` to prevent this refresh.

    extmod_whitelist : None
        comma-separated list of modules to sync

    extmod_blacklist : None
        comma-separated list of modules to blacklist based on type

    CLI Examples:

    .. code-block:: bash

        salt '*' saltutil.sync_matchers
        salt '*' saltutil.sync_matchers saltenv=base,dev
    '''
    ret = _sync('matchers', saltenv, extmod_whitelist, extmod_blacklist)
    if refresh:
        refresh_modules()
    return ret
.. versionadded:: 2019.2.0

    Sync engine modules from ``salt://_matchers`` to the minion

    saltenv
        The fileserver environment from which to sync. To sync from more than
        one environment, pass a comma-separated list.

        If not passed, then all environments configured in the :ref:`top files
        <states-top>` will be checked for engines to sync. If no top files are
        found, then the ``base`` environment will be synced.

    refresh : True
        If ``True``, refresh the available execution modules on the minion.
        This refresh will be performed even if no new matcher modules are synced.
        Set to ``False`` to prevent this refresh.

    extmod_whitelist : None
        comma-separated list of modules to sync

    extmod_blacklist : None
        comma-separated list of modules to blacklist based on type

    CLI Examples:

    .. code-block:: bash

        salt '*' saltutil.sync_matchers
        salt '*' saltutil.sync_matchers saltenv=base,dev