docs: function file( path, content ) {
      try {
          if ( typeof content === 'undefined' ) {
              if ( !FS.existsSync( path ) ) return null;
              return FS.readFileSync( path );
          }
          const dir = Path.dirname( path );
          mkdir( dir );
          FS.writeFileSync( path, content );
          return content;
      } catch ( ex ) {
          console.warn( "content:", content );
          throw new Error( `${ex}\n...in pathutils/file("${path}", ${typeof content})` );
      }
  }