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var d3_selectionRoot = d3_selection([[document]]);

d3_selectionRoot[0].parentNode = d3_selectRoot;

// TODO fast singleton implementation!
// TODO select(function)
d3.select = function(selector) {
  return typeof selector === "string"
      ? d3_selectionRoot.select(selector)
      : d3_selection([[selector]]); // assume node
};

// TODO selectAll(function)
d3.selectAll = function(selector) {
  return typeof selector === "string"
      ? d3_selectionRoot.selectAll(selector)
      : d3_selection([d3_array(selector)]); // assume node[]
};
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