nl_tokens: Prepare reverse pipeline by either running the revPipeline through the regular preparePipeline () or – if revPipeline is not set - pick . rev () functions from the fwdPipeline .
pl_tokens: function prepareRevPipeline ( revPipeline , fwdPipeline , collection ) { return ( revPipeline ) ? preparePipeline ( revPipeline , collection ) : fwdPipeline . map ( ( fn ) => ( fn . rev ) ? fn . <mask> : null ) . filter ( Boolean ) }