window.downloadFile = (filename, contentType, base64Data) => {
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    const byteNumbers = new Array(byteCharacters.length);
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    const byteArray = new Uint8Array(byteNumbers);
    const blob = new Blob([byteArray], { type: contentType });
    
    const url = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = filename;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    window.URL.revokeObjectURL(url);
};

window.readFileAsText = (fileInput) => {
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        const file = fileInput.files[0];
        if (!file) {
            resolve('');
            return;
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        const reader = new FileReader();
        reader.onload = (e) => resolve(e.target.result);
        reader.onerror = (e) => reject(e);
        reader.readAsText(file);
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};