3 examples of 'btoa nodejs' in JavaScript

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function btoa(str) {
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  let buffer;
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  if (str instanceof Buffer) {
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    buffer = str;
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  } else {
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    buffer = new Buffer(str.toString(), 'binary');
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  }
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  return buffer.toString('base64');
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}

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function atob(str) {
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  // normal window
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  if ('function' === typeof a2b) {
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    return a2b(str);
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  }
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  // browserify (web worker)
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  else if ('function' === typeof Buffer) {
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    return new Buffer(str, 'base64').toString('binary');
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  }
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  // ios web worker with base64js
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  else if ('object' === typeof w.base64js) {
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    // bufferToBinaryString
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    // https://github.com/coolaj86/unibabel-js/blob/master/index.js#L50
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    var buf = w.base64js.b64ToByteArray(str);
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    return Array.prototype.map.call(buf, function (ch) {
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      return String.fromCharCode(ch);
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    }).join('');
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  }
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  // ios web worker without base64js
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  else {
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    throw new Error("you're probably in an ios webworker. please include use beatgammit's base64-js");
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  }
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}

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function browserAtob(input) {
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  try {
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    return window.atob(input);
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  } catch (e) {
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    return null;
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  }
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}