Write Buffer to FS and add record to Files collection. This function is asynchronous.

FilesCollection#writeAsync(buffer: Buffer, opts?: WriteOpts, proceedAfterUpload?: boolean): Promise<FileObj>;

• buffer {Buffer} - File data as Buffer
• opts {object} - Recommended properties:
  • opts.fileName {string} - File name with extension, like name.ext
  • opts.type {string} - Mime-type, like image/png
  • opts.size {number} - File size in bytes, if not set file size will be calculated from Buffer
  • opts.meta {object} - Object with custom meta-data
  • opts.userId {string} - UserId, default null
  • opts.fileId {string} - id, optional - if not set - Random.id() will be used
• proceedAfterUpload {boolean} - Proceed onAfterUpload hook (if defined) after Buffer is written to FS
• Returns {Promise} - newly created file's object from DB

import { readFile } from 'node:fs/promises';
import { FilesCollection } from 'meteor/ostrio:files';

const imagesCollection = new FilesCollection({collectionName: 'images'});

try {
  const data = await readFile('/data/imgs/sample.png');
  const fileRef = await imagesCollection.writeAsync(data, {
    fileName: 'sample.png',
    fileId: 'abc123myId',
    type: 'image/png'
  });
  console.log(`${fileRef.name} is successfully saved to FS. _id: ${fileRef._id}`);
} catch (error) {
  console.error('Failed to save image:', error);
}