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#
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from io import TextIOWrapper
from pathlib import Path
from typing import List, Union

def toFile(outputFile: Union[Path, TextIOWrapper], contents: List[str], delimiter: str = "\n") -> None:
    """Generates a user specified delimited file. 

    Writes the elements of a List of strings with a given delimiter. The state of
    the file is inspected to determine if it should be opened. If the file is
    already opened, the file is not closed after writing.
    
    Args: 
        outputFile: Path to file for writing manifest.
        contents: List of items to write manifest.
        delimiter: Symbol used to delimit elements when writing file.
    
    Raises:
        AssertionError: If contents is not a List[str]

    Notes:
        - If outputFile is a TextIOWrapper, the file must not be closed.
        - Providing an open file is useful for writing multiple calls to the same file.
    """
    assert isinstance(contents, list), f"contents must be a list, found {type(contents)}"
    assert isinstance(contents[0], str), f"contents elements must be a str, found {type(contents[0])}"

    isTextIO = isinstance(outputFile, TextIOWrapper)
    if isTextIO:
        if outputFile.closed:
            raise ValueError(f"Provided file {outputFile.name} is already closed: outputFile must be an open file, or a Path.")

    f = outputFile if isTextIO else open(outputFile, "w")

    for chunk in contents:
        try:
            f.write(f"{chunk}{delimiter}")
        except:
            if not isTextIO:
                f.close()
            raise

    if not isTextIO:
        f.close()

    
