react-facebook-next/lib/utils/clearUndefinedProperties.js

Facebook components like a Login button, Like, Share, Comments or Embedded Post

export default function clearUndefinedProperties(obj) {
  if (!obj) {
    return obj;
  }

  var newObj = {};

  Object.keys(obj).forEach(function (propertyName) {
    var value = obj[propertyName];
    if (value !== undefined) {
      newObj[propertyName] = value;
    }
  });

  return newObj;
}
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