{
  config: { <contents of config.json> }, // parsed as JSON
  tables: {
    population: <contents of population.csv> // as a string
    growth:     <contents of growth.csv>
  },
  slides: [
    <contents of 0.txt>,  // because these files have
    <contents of 1.txt>,  // numeric names, `slides` is
    <contents of 2.txt>,  // an array, not an object
    <contents of 3.txt>
  ],
  i18n: {
    "en-GB": <contents of en-GB.json>,
    "en-US": <contents of en-US.json>,
    "fr":    <contents of fr.json>,
    "de":    <contents of de.json>,
    ...
  }
}

callback = function ( error, result ) {
  if ( error ) {
    return handleError( error );
  }

  doSomething( result );
};

spelunk( 'myFolder', options, callback ); // you can omit options

spelunk( 'myFolder', options ).then( doSomething, handleError );

var result = spelunk.sync( 'myFolder', options );

spelunk( 'myFolder', { exclude: '**/README.md' }).then( doSomething );

spelunk( 'myFolder', { keepExtensions: true }).then( doSomething );