nl_tokens: Low - level span serializer
pl_tokens: function SpanSerializer ( props ) { const { mark , children } = props . node const isPlain = typeof mark === 'string' const markType = isPlain ? <mask> : mark . _type const serializer = props . serializers . marks [ markType ] if ( ! serializer ) { // @todo Revert back to throwing errors? // eslint-disable-next-line no-console console . warn ( ` ${ markType } \` \` ` ) return h ( props . serializers . markFallback , null , children ) } return h ( serializer , props . node , children ) }