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const redaction = require('@groupdocs/groupdocs.redaction');
const java = require('java');

const FileOutputStream = java.import('java.io.FileOutputStream');

const testFile = 'sample.docx';
const testPageNumber = 1;
const previewFileName = `sample_page${testPageNumber}.png`;

const createPageStream = java.newProxy('com.groupdocs.redaction.options.ICreatePageStream', {
  createPageStream: function (_pageNumber) {
    return new FileOutputStream(previewFileName);
  }
});

const redactor = new redaction.Redactor(testFile);
try {
  const options = new redaction.PreviewOptions(createPageStream);
  options.setHeight(640);
  options.setWidth(480);
  options.setPageNumbers(java.newArray('int', [testPageNumber]));
  options.setPreviewFormat(redaction.PreviewFormats.Png);
  redactor.generatePreview(options);
  console.log(`Preview for page ${testPageNumber} was saved to "${previewFileName}"`);
} finally {
  redactor.close();
}