How to use the @canopycanopycanopy/b-ber-shapes-directives.BLOCK_DIRECTIVES.indexOf function in @canopycanopycanopy/b-ber-shapes-directives

const _isUnsupportedAttribute = (genus, attr) => {
  let key
  if (BLOCK_DIRECTIVES.indexOf(genus) > -1) {
    // these are all containers which share the same attributes, so they're
    // grouped under a single property
    key = 'block'
  } else {
    // this will be the directive name, e.g., figure, video, etc
    key = genus
  }

  return SUPPORTED_ATTRIBUTES[key][attr] !== true // bool
}

const _directiveOrder = genus =>
  BLOCK_DIRECTIVES.indexOf(genus) > -1
    ? 'block'
    : INLINE_DIRECTIVES.indexOf(genus) > -1
    ? 'inline'
    : MISC_DIRECTIVES.indexOf(genus) > -1
    ? 'misc'
    : null