select2-8.x-1.11/config/schema/select2.schema.yml

field.widget.settings.select2:
  type: field.widget.settings.options_select
  label: 'Select2 simple widget'
  mapping:
    width:
      type: string
      label: 'Field width'

field.widget.settings.select2_entity_reference:
  type: field.widget.settings.select2
  label: 'Select2 entity reference widget'
  mapping:
    autocomplete:
      type: boolean
      label: 'Autocomplete'
    match_operator:
      type: string
      label: 'Autocomplete matching'
    match_limit:
      type: integer
      label: 'Maximum number of autocomplete suggestions.'

better_exposed_filters.filter.bef_select2:
  label: 'Select2'
  type: better_exposed_filters_filter_widget