Preparation code

<div id="b-test-block" class="b-test-block" onclick="return {'b-test-block':{}}" bem-block-params="return {'b-test-block':{}}" />
<script>
  Benchmark.prototype.setup = function() {
    var extractParamsOnClick = function(element) {
      var fn = element.onclick;
      var params = fn ? fn() : {};
      return params;
    }
    
        var customAttrName = 'bem-block-params';
        var extractParamsCustomAttr = function(element) {
          var attrValue = element.hasAttribute(customAttrName) ? element.getAttribute(customAttrName) : null;
          var params = attrValue ? Function(attrValue)() : {};
          return params;
        }
    var testElement = document.getElementById('b-test-block');
  };
</script>

Preparation code output

Test runner

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var params = extractParamsOnClick(testElement);

var params = extractParamsCustomAttr(testElement);

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