docs: function _load(file, defaultConfig, dump) {
  
      const f = normalize(file);
      const b = f.base;
      const p = f.profile;
      const ext = f.ext;
  
      if (ext) {
          const p = b + ext;
          let r = loadSpecific(b, '.js', p, defaultConfig, dump);
          if (r) return r;
  
          if (defaultConfig) return defaultConfig;
  
          throw new Error('file not found: ' + p);
      }
  
      let r = loadSpecific(b, '.yml', p, defaultConfig, dump);
      if (r) return r;
  
      r = loadSpecific(b, '.yaml', p, defaultConfig, dump);
      if (r) return r;
  
      r = loadSpecific(b, '.json', p, defaultConfig, dump);
      if (r) return r;
  
      r = loadSpecific(b, '.js', p, defaultConfig, dump);
      if (r) return r;
  
      if (defaultConfig) return defaultConfig;
  
      throw new Error(`file not found: ${b}[.profile].yml( or .yaml/.json/.js)`);
  
  }