@wordpress/media-utils/build-module/utils/flatten-form-data.js

WordPress Media Upload Utils.

/**
 * Determines whether the passed argument appears to be a plain object.
 *
 * @param data The object to inspect.
 */
function isPlainObject(data) {
  return data !== null && typeof data === 'object' && Object.getPrototypeOf(data) === Object.prototype;
}

/**
 * Recursively flatten data passed to form data, to allow using multi-level objects.
 *
 * @param {FormData}      formData Form data object.
 * @param {string}        key      Key to amend to form data object
 * @param {string|Object} data     Data to be amended to form data.
 */
export function flattenFormData(formData, key, data) {
  if (isPlainObject(data)) {
    for (const [name, value] of Object.entries(data)) {
      flattenFormData(formData, `${key}[${name}]`, value);
    }
  } else if (data !== undefined) {
    formData.append(key, String(data));
  }
}
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