[JS] showDirectoryPicker: ルートディレクトリからファイルパスを取得

getFileNamesFromRoot.js

  // @see: https://developer.mozilla.org/en-US/docs/Web/API/FileSystemDirectoryHandle
  async function* load (dirHandle, dir = '') {
    const currentdir = dir + '/' + dirHandle.name;
    for await (const handle of dirHandle.values()) {
      if (handle.kind === 'file') {
        yield currentdir + '/' + handle.name;
      } else if (handle.kind === 'directory') {
        yield* load(handle, currentdir);
      }
    }
  }
  
// Usage
async function readDirectory() {
  const dirHandle = await showDirectoryPicker({ mode: 'read' });
  if (!dirHandle) return;

  for await (const filename of load(dirHandle)) {
    console.log(filename); // /root/sub/filename.ext
  }
}