{"ast":null,"code":"import useLayoutEffect from \"../useLayoutEffect\";\nimport UIManager from \"../../exports/UIManager\";\nimport canUseDOM from \"../canUseDom\";\nvar DOM_LAYOUT_HANDLER_NAME = '__reactLayoutHandler';\nvar didWarn = !canUseDOM;\nvar resizeObserver = null;\nfunction getResizeObserver() {\n  if (canUseDOM && typeof window.ResizeObserver !== 'undefined') {\n    if (resizeObserver == null) {\n      resizeObserver = new window.ResizeObserver(function (entries) {\n        entries.forEach(function (entry) {\n          var node = entry.target;\n          var onLayout = node[DOM_LAYOUT_HANDLER_NAME];\n          if (typeof onLayout === 'function') {\n            UIManager.measure(node, function (x, y, width, height, left, top) {\n              var event = {\n                nativeEvent: {\n                  layout: {\n                    x: x,\n                    y: y,\n                    width: width,\n                    height: height,\n                    left: left,\n                    top: top\n                  }\n                },\n                timeStamp: Date.now()\n              };\n              Object.defineProperty(event.nativeEvent, 'target', {\n                enumerable: true,\n                get: function get() {\n                  return entry.target;\n                }\n              });\n              onLayout(event);\n            });\n          }\n        });\n      });\n    }\n  } else if (!didWarn) {\n    if (process.env.NODE_ENV !== 'production' && process.env.NODE_ENV !== 'test') {\n      console.warn('onLayout relies on ResizeObserver which is not supported by your browser. 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