@wordpress/upload-media/build-module/get-mime-types-array.js

Core media upload logic.

/**
 * Browsers may use unexpected mime types, and they differ from browser to browser.
 * This function computes a flexible array of mime types from the mime type structured provided by the server.
 * Converts { jpg|jpeg|jpe: "image/jpeg" } into [ "image/jpeg", "image/jpg", "image/jpeg", "image/jpe" ]
 *
 * @param {?Object} wpMimeTypesObject Mime type object received from the server.
 *                                    Extensions are keys separated by '|' and values are mime types associated with an extension.
 *
 * @return An array of mime types or null
 */
export function getMimeTypesArray(wpMimeTypesObject) {
  if (!wpMimeTypesObject) {
    return null;
  }
  return Object.entries(wpMimeTypesObject).flatMap(([extensionsString, mime]) => {
    const [type] = mime.split('/');
    const extensions = extensionsString.split('|');
    return [mime, ...extensions.map(extension => `${type}/${extension}`)];
  });
}
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