image-gallery useUploadImage.tsx

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  export function getImageExtension(file: File) {
  const splitted = file.name.split(".");
 
  if (splitted.length) {
    const ext = splitted.pop()?.toLowerCase();
 
    return ext;
  }
}
 
export function isImage(file: File, allowedExtensions?: string[]) {
  const extension = getImageExtension(file);
 
  if (extension) {
    return (allowedExtensions ?? ["png", "jpeg", "jpg"]).includes(extension);
  }
}