Some crappy string obfuscation thing

main.js

function _arrayBufferToBase64( buffer ) {
    var binary = '';
    var bytes = new Uint8Array( buffer );
    var len = bytes.byteLength;
    for (var i = 0; i < len; i++) {
        binary += String.fromCharCode( bytes[ i ] );
    }
    return window.btoa( binary );
}

encode = (s) => {
  var charmap = [...s].reduce((a,b,c)=>({...a,[b]:[...a[b]||[],c]}),{});
  var sorted = Object.keys(charmap).sort().reduce((o,k)=>({...o,[k]:charmap[k]}),{});
  console.log({charmap, sorted});
  var v = Object.entries(sorted).reduce((a,[b,c])=>[...a,b.charCodeAt(0),c.length,...c],[]);
  var a = new Uint8Array(v);
  return _arrayBufferToBase64(a);
}

decode = (a) => {
  a=atob(a);
  var b='';
  var c=0;
  return new Uint8Array(a.length)
    .map((_,d)=>a.charCodeAt(d))
    .reduce((d,e)=>{
    if(c<0){
      c=e;
      return d;
    }else if(c===0){
      b=String.fromCharCode(e)
    }else{
      f=e;
      if(d.length<f+1){
        d=[...d,...new Array(f-d.length),b]
      }else{
        d=[...d.slice(0,f),b,...d.slice(f+1)]
      }
    }
    c--;
    return d;
  }, []).join('')
}

/////////////////////////////////////////////////
s="put your text here";
/////////////////////////////////////////////////

u=encode(s);
c=`(${decode.toString().replace(/;\s*\}/g, '}').replace(/\s+/g, ' ').replace(/\s+([\.\[\]\{\}=])/g,'$1').replace(/([;,=\.\[\]\{\}=])\s+/g,'$1')})(${JSON.stringify(u)})`;

// safety check
decoded=eval(c); if (s!==decoded) { throw new Error(JSON.stringify({decodeFuncError:{decodedTo:decoded,expected:s}})); }

console.log(c)