The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Promise

[Claudio Heidel Schemberger]

When I run the example from using Node.js v22.1.0 (with prev.21 also):

const createReport = require('docx-templates');
const fetch = require('node-fetch');

const getFunFact = async () => {
  try {
    // Replace with a real API endpoint to fetch fun facts
    const response = await fetch('https://api.funfacts.com');
    const data = await response.json();
    return data.funFact;
  } catch (error) {
    console.error('Error fetching fun fact', error);
    return 'Oops, we could not fetch a fun fact this time.';
  }
};

const generateNewsletter = async () => {
  try {
    const funFact = await getFunFact();

    await createReport({
      template: 'NewsletterTemplate.docx',
      output: 'PersonalizedNewsletter.docx',
      data: {
        month: 'September',
        firstName: 'John',
        spotlightImage: 'path/to/your/image.jpg',
        spotlightText: 'This month, we have been working on some exciting projects that we can’t wait to share with you!',
        funFact,
        signOffName: 'The XYZ Team',
      },
      additionalJsContext: {
        img: (src) => ({ width: 6, height: 4, path: src }),
      },
    });
    console.log('Newsletter created successfully!');
  } catch (error) {
    console.error('Error generating newsletter', error);
  }
};

generateNewsletter(); 

I found the bellow error:

# node gendoc.js
node:internal/errors:541
      throw error;
      ^

TypeError [ERR_INVALID_ARG_TYPE]: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of Promise
    at Object.writeFileSync (node:fs:2356:5)
    at Object.<anonymous> (/Users/cohr/Projects/MACC/docx/gendoc.js:23:4)
    at Module._compile (node:internal/modules/cjs/loader:1480:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1564:10)
    at Module.load (node:internal/modules/cjs/loader:1287:32)
    at Module._load (node:internal/modules/cjs/loader:1103:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:168:12)
    at node:internal/main/run_main_module:30:49 {
  code: 'ERR_INVALID_ARG_TYPE'
}