How to use the substring function from base64-js

client-bundle.js

GitHub: Ginger-Stone/2-Player-tic-tac-toe

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    base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
    base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
    base64 += chars[bytes[i + 2] & 63];
}
if (len % 3 === 2) {
    base64 = base64.substring(0, base64.length - 1) + '=';
}
else if (len % 3 === 1) {
    base64 = base64.substring(0, base64.length - 2) + '==';
}

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+ 9 other calls in file