Function is

test/babel.js:738–749

(type, node, opts)

	var TYPES = exports.TYPES = (0, _keys2.default)(t.VISITOR_KEYS).concat((0, _keys2.default)(t.FLIPPED_ALIAS_KEYS)).concat((0, _keys2.default)(t.DEPRECATED_KEYS));

	function is(type, node, opts) {
	  if (!node) return false;

	  var matches = isType(node.type, type);
	  if (!matches) return false;

	  if (typeof opts === "undefined") {
	    return true;
	  } else {
	    return t.shallowEqual(node, opts);
	  }
	}

	function isType(nodeType, targetType) {
	  if (nodeType === targetType) return true;