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state : null;\n  }\n  // Binding \"this\" is important for shallow renderer support.\n  this.setState(updater.bind(this));\n}\n\nfunction componentWillUpdate(nextProps, nextState) {\n  try {\n    var prevProps = this.props;\n    var prevState = this.state;\n    this.props = nextProps;\n    this.state = nextState;\n    this.__reactInternalSnapshotFlag = true;\n    this.__reactInternalSnapshot = this.getSnapshotBeforeUpdate(\n      prevProps,\n      prevState\n    );\n  } finally {\n    this.props = prevProps;\n    this.state = prevState;\n  }\n}\n\n// React may warn about cWM/cWRP/cWU methods being deprecated.\n// Add a flag to suppress these warnings for this special case.\ncomponentWillMount.__suppressDeprecationWarning = true;\ncomponentWillReceiveProps.__suppressDeprecationWarning = true;\ncomponentWillUpdate.__suppressDeprecationWarning = true;\n\nfunction polyfill(Component) {\n  var prototype = Component.prototype;\n\n  if (!prototype || !prototype.isReactComponent) {\n    throw new Error('Can only polyfill class components');\n  }\n\n  if (\n    typeof Component.getDerivedStateFromProps !== 'function' &&\n    typeof prototype.getSnapshotBeforeUpdate !== 'function'\n  ) {\n    return Component;\n  }\n\n  // If new component APIs are defined, \"unsafe\" lifecycles won't be called.\n  // Error if any of these lifecycles are present,\n  // Because they would work differently between older and newer (16.3+) versions of React.\n  var foundWillMountName = null;\n  var foundWillReceivePropsName = null;\n  var foundWillUpdateName = null;\n  if (typeof prototype.componentWillMount === 'function') {\n    foundWillMountName = 'componentWillMount';\n  } else if (typeof prototype.UNSAFE_componentWillMount === 'function') {\n    foundWillMountName = 'UNSAFE_componentWillMount';\n  }\n  if (typeof prototype.componentWillReceiveProps === 'function') {\n    foundWillReceivePropsName = 'componentWillReceiveProps';\n  } else if (typeof prototype.UNSAFE_componentWillReceiveProps === 'function') {\n    foundWillReceivePropsName = 'UNSAFE_componentWillReceiveProps';\n  }\n  if (typeof prototype.componentWillUpdate === 'function') {\n    foundWillUpdateName = 'componentWillUpdate';\n  } else if (typeof prototype.UNSAFE_componentWillUpdate === 'function') {\n    foundWillUpdateName = 'UNSAFE_componentWillUpdate';\n  }\n  if (\n    foundWillMountName !== null ||\n    foundWillReceivePropsName !== null ||\n    foundWillUpdateName !== null\n  ) {\n    var componentName = Component.displayName || Component.name;\n    var newApiName =\n      typeof Component.getDerivedStateFromProps === 'function'\n        ? 'getDerivedStateFromProps()'\n        : 'getSnapshotBeforeUpdate()';\n\n    throw Error(\n      'Unsafe legacy lifecycles will not be called for components using new component APIs.\\n\\n' +\n        componentName +\n        ' uses ' +\n        newApiName +\n        ' but also contains the following legacy lifecycles:' +\n        (foundWillMountName !== null ? '\\n  ' + foundWillMountName : '') +\n        (foundWillReceivePropsName !== null\n          ? '\\n  ' + foundWillReceivePropsName\n          : '') +\n        (foundWillUpdateName !== null ? '\\n  ' + foundWillUpdateName : '') +\n        '\\n\\nThe above lifecycles should be removed. Learn more about this warning here:\\n' +\n        'https://fb.me/react-async-component-lifecycle-hooks'\n    );\n  }\n\n  // React <= 16.2 does not support static getDerivedStateFromProps.\n  // As a workaround, use cWM and cWRP to invoke the new static lifecycle.\n  // Newer versions of React will ignore these lifecycles if gDSFP exists.\n  if (typeof Component.getDerivedStateFromProps === 'function') {\n    prototype.componentWillMount = componentWillMount;\n    prototype.componentWillReceiveProps = componentWillReceiveProps;\n  }\n\n  // React <= 16.2 does not support getSnapshotBeforeUpdate.\n  // As a workaround, use cWU to invoke the new lifecycle.\n  // Newer versions of React will ignore that lifecycle if gSBU exists.\n  if (typeof prototype.getSnapshotBeforeUpdate === 'function') {\n    if (typeof prototype.componentDidUpdate !== 'function') {\n      throw new Error(\n        'Cannot polyfill getSnapshotBeforeUpdate() for components that do not define componentDidUpdate() on the prototype'\n      );\n    }\n\n    prototype.componentWillUpdate = componentWillUpdate;\n\n    var componentDidUpdate = prototype.componentDidUpdate;\n\n    prototype.componentDidUpdate = function componentDidUpdatePolyfill(\n      prevProps,\n      prevState,\n      maybeSnapshot\n    ) {\n      // 16.3+ will not execute our will-update method;\n      // It will pass a snapshot value to did-update though.\n      // Older versions will require our polyfilled will-update value.\n      // We need to handle both cases, but can't just check for the presence of \"maybeSnapshot\",\n      // Because for <= 15.x versions this might be a \"prevContext\" object.\n      // We also can't just check \"__reactInternalSnapshot\",\n      // Because get-snapshot might return a falsy value.\n      // So check for the explicit __reactInternalSnapshotFlag flag to determine behavior.\n      var snapshot = this.__reactInternalSnapshotFlag\n        ? this.__reactInternalSnapshot\n        : maybeSnapshot;\n\n      componentDidUpdate.call(this, prevProps, prevState, snapshot);\n    };\n  }\n\n  return Component;\n}\n\nexport { polyfill };\n"],"sourceRoot":""}