def encode_file(file: List[str]) -> 'BitArray':
encode = Encode()
file_content = ''.join(file)
frequencies = encode.get_frequencies(file_content)
parent = encode.get_node_tree(frequencies)
hash_table = {}
parent.generate_hashT(hash_table, "")
encoded_text = encode.encode_text(file_content, hash_table)
char_size = Utils.get_largest_char_size(hash_table)
encoded_header = BitArray()
encoded_header = Utils.save_char_size_bits(encoded_header, char_size)
encode.encode_headers(parent, encoded_header, char_size)
bits = encoded_header.bin + encoded_text
return BitArray('0b' + bits)
