paths-to-files.js

class FS {
     root = {
          type:'directory',
          name:'/',
          children:[],
     }
     sort(node) {
          node.children.sort((a, b) => {
               if (a.type == b.type) return a.name.localeCompare(b.name);
               if (a.type === 'directory') return -1;
               return 1;
          })
     }
     mkdir(path) {
          let cwd = this.root;
          const dirs = path.substr(1).split('/');
          dirs.forEach(name => {
               const dir = cwd.children.filter(child => (
                    child.name == name
               )).shift();
               if (!dir) {
                    const next_cwd = { type:'directory', name, children:[]};
                    cwd.children.push(next_cwd);
                    this.sort(cwd);
                    cwd = next_cwd;
               } else cwd = dir;
          })
          return cwd;
     }
     mkfile(path) {
          const parts = path.split('/');
          const name = parts.pop();
          const dir = parts.join('/');
          const cwd = this.mkdir(dir);
          const file = { type: 'file', name  };
          cwd.children.push(file);
          this.sort(cwd);
     }
     add(path) {
          const parts = path.split('/');
          const last = parts.pop();
          if (last.indexOf('.') >= 0) this.mkfile(path)
          else this.mkdir(path)
     }
     constructor(paths) { paths.map(path => this.add(path)) }
}

const fs = new FS([
     '/path/to/something.txt',
     '/path/to',
     '/path/to/anything.txt',
     '/path/to/some/deep/file.txt',
     '/another/path/to/some/file.txt',
]);
console.log(JSON.stringify(fs.root, null, 2));