JavaScript Reducing duplicate characters in a string to a given minimum reduce duplicate characters to a desired minimum

I guess my best solution would be like

var str = "axxxaabbbbcaaxxxaab",
 redStr = (s,n) => s.replace(/(\w)\1+/g,"$1".repeat(n));
console.log(redStr(str,2));
Answer:1

I tried to make it as short as possible:

reduceString = function(str, amount) {
    var finalString = '', cL = '', counter;
    str.split('').forEach(function(i){
        if (i !== cL) counter = 0;
        counter++;
        cL = i;
        if (counter <= amount ) finalString = finalString + i;
    });
    return finalString;
}
Answer:2

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