src/index.js
function to64(index, count) {
    let result = '';

    while (--count >= 0) { // Result char count.
        result += itoa64[index & 63]; // Get corresponding char.
        index = index >> 6; // Move to next one.
    }

    return result;
}
function to64(index, count) {
    let result = '';

    while (--count >= 0) { // Result char count.
        result += itoa64[index & 63]; // Get corresponding char.
        index = index >> 6; // Move to next one.
    }

    return result;
}
function to64 ( index , count ) { let result = '' ; while ( -- count >= 0 ) { // Result char count. result += itoa64 [ index & 63 ] ; // Get corresponding char. index = index >> 6 ; // Move to next one. } return result ; }
To 64 bit version.
To 64 bit version .