@ethersphere/bee-js/dist/mjs/utils/file.js

Javascript client for Bee

/**
 * Compatibility functions for working with File API objects
 *
 * https://developer.mozilla.org/en-US/docs/Web/API/File
 */
export function isFile(file) {
  // browser
  if (typeof File === 'function' && file instanceof File) {
    return true;
  }
  // node.js
  const f = file;
  return typeof f === 'object' && typeof f.name === 'string' && (typeof f.stream === 'function' || typeof f.arrayBuffer === 'function');
}
/**
 * Compatibility helper for browsers where the `arrayBuffer function is
 * missing from `File` objects.
 *
 * @param file A File object
 */
export async function fileArrayBuffer(file) {
  if (file.arrayBuffer) {
    return file.arrayBuffer();
  }
  // workaround for Safari where arrayBuffer is not supported on Files
  return new Promise(resolve => {
    const fr = new FileReader();
    fr.onload = () => resolve(fr.result);
    fr.readAsArrayBuffer(file);
  });
}