cordova-file-plugin write file example works on android 9

run-this-in-chrome-inspect-console.js

// from https://forum.quasar-framework.org/topic/3375/solved-v1-download-a-file-in-cordova-app/2
window.test = {};
window.test.writeFile = (fileName, content) => {
  return new Promise((ok, fail) => {
    //@ts-ignore
    if (!window.requestFileSystem) {
      console.error(`$ window.requestFileSystem is not available`);
      fail(false);
      return;
    }
    //@ts-ignore
    const dirPath = cordova.file.externalRootDirectory + 'Download';
    const fullPath = dirPath + '/' + fileName;
    console.log(`$ writeFile fullPath`, fullPath);
    //@ts-ignore
    window.resolveLocalFileSystemURL(
      //@ts-ignore
      dirPath,
      fs => {
        console.log('file system open: ' + fs.name);
        fs.getFile(fileName, { create: true, exclusive: false }, function(fileEntry) {
          console.log('$ fileEntry is file?' + fileEntry.isFile.toString());
          // fileEntry.name == 'someFile.txt'
          // fileEntry.fullPath == '/someFile.txt'

          // Create a FileWriter object for our FileEntry (log.txt).
          fileEntry.createWriter(function(fileWriter) {
            fileWriter.onwriteend = function() {
              console.log('$  Successful file write... fileEntry.fullPath', fileEntry.fullPath);
              ok(fileEntry.fullPath);
              // readFile(fileEntry);
            };

            fileWriter.onerror = function(e) {
              console.error('$ Failed file write: ' + e.toString());
            };

            fileWriter.write(new Blob([content], { type: 'text/plain' }));
          });
        });
      },
      e => {
        console.error(`$  window.resolveLocalFileSystemURL e`, e);
        fail('');
      },
    );
  });
};

window.test.writeFile("123-file","test")