Configuring your new Eleventy site

const A_o = require( './A_o.js' )

const U_o =
{
  dev_b: true,     //: development/production switch
  //dev_b: false,
  url_s: null,

  DEV_s: A_o.LOCAL_s,
  PRO_s: A_o.URL_s,

  GIT_s: `https://github.com/${A_o.AUTHOR_s}/${A_o.ID_s}/`,
  TWI_s: `https://twitter.com/${A_o.ID_s}/`,
  RSS_s: `${A_o.URL_s}feed.xml`,
  SERVICE_PATH_s: 'assets/scripts/js/service_worker.min.js',

  HOME_s:    `[Home page]: ${A_o.URL_s}`,
  NODE_s :   `[Node.js]: https://nodejs.org`,
  COMMENT_s: `[utteranc.es]: https://github.com/utterance/utterances`,

  FRAME_s:     '11ty Frame',
  FRAME_URL_s: `https://11tyframe.netlify.com/`,

  ELEVENTY_s:     `[Eleventy]: https://11ty.io`,
  ELEVENTY_JFM_s: `/docs/data-frontmatter/#javascript-front-matter`,
  ELEVENTY_UDF_s: `/docs/data-frontmatter/#user-defined-front-matter-customizations`,

  OUTLINK_s: '{target="_blank" rel="noreferrer noopener"}',

}
void function () { U_o.url_s = U_o[U_o.dev_b === true ? 'DEV_s' : 'PRO_s'] } ()
console.log( `Site URL: ${U_o.url_s}` )

module.exports = U_o

const EXPORT_a =    // default exported data
[
  'date',
  'layout',
  'permalink',
  'tags',
  'rank_n',
  'title_s',
  'subtitle_s',
  'abstract_s',
  'author_s',
  'A_o',
]

module.exports =
{
  data__o: ( permalink_s, collection_a ) =>
  {
    //> console.log( permalink_s )
    let export_o = {}
    collection_a.forEach( collection_o =>
      {
        const data_o = collection_o.data
        if ( data_o.permalink === permalink_s )
        {
          if ( data_o.export_a === null ) export_o = data_o    //: get all data!
          else
          {
            const export_a = data_o.export_a || EXPORT_a    //: get declared or default data only
            export_a.forEach( prop_s => export_o[prop_s] = data_o[prop_s] )
          }
        }
      } )    
    return export_o
  },
}