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https://wicg.github.io/netinfo/#dom-networkinformation-savedata\ntype ConnectionSaveData = boolean;\n\ninterface Events {\n change: Event;\n}\n\ninterface Connection {\n type: ConnectionType;\n effectiveType: ConnectionEffectiveType;\n saveData: ConnectionSaveData;\n addEventListener<K extends keyof Events>(\n type: K,\n listener: (event: Events[K]) => void,\n ): void;\n removeEventListener<K extends keyof Events>(\n type: K,\n listener: (event: Events[K]) => void,\n ): void;\n}\n\n// Create (optional) connection APIs on navigator\ndeclare global {\n interface Navigator {\n connection?: Connection;\n mozConnection?: Connection;\n webkitConnection?: Connection;\n }\n}\n// Use a constant test of this form because in SSR on next.js, optional chaining is not sufficient,\n// but this test correctly detects that window is not available and allows for conditionals before access\nconst isWindowPresent = typeof window !== 'undefined';\n\n// Check if window exists and if the browser supports the connection API\nconst connection = isWindowPresent\n ? window.navigator.connection ||\n window.navigator.mozConnection ||\n window.navigator.webkitConnection\n : undefined;\n\n// Map browser types to native types\nconst typeMapping: Record<ConnectionType, NetInfoStateType> = {\n bluetooth: NetInfoStateType.bluetooth,\n cellular: NetInfoStateType.cellular,\n ethernet: NetInfoStateType.ethernet,\n none: NetInfoStateType.none,\n other: NetInfoStateType.other,\n unknown: NetInfoStateType.unknown,\n wifi: NetInfoStateType.wifi,\n wimax: NetInfoStateType.wimax,\n mixed: NetInfoStateType.other,\n};\nconst effectiveTypeMapping: Record<\n ConnectionEffectiveType,\n NetInfoCellularGeneration\n> = {\n '2g': NetInfoCellularGeneration['2g'],\n '3g': NetInfoCellularGeneration['3g'],\n '4g': NetInfoCellularGeneration['4g'],\n 'slow-2g': NetInfoCellularGeneration['2g'],\n};\n\n// Determine current state of connection\nconst getCurrentState = (\n _requestedInterface?: string,\n): Pick<NetInfoState, Exclude<keyof NetInfoState, 'isInternetReachable'>> => {\n const isConnected = navigator.onLine;\n const baseState = {\n isInternetReachable: null,\n };\n\n // If we don't have a connection object, we return minimal information\n if (!connection) {\n if (isConnected) {\n const state: NetInfoOtherState = {\n ...baseState,\n isConnected: true,\n type: NetInfoStateType.other,\n details: {\n isConnectionExpensive: false,\n },\n };\n return state;\n }\n\n const state: NetInfoNoConnectionState = {\n ...baseState,\n isConnected: false,\n isInternetReachable: false,\n type: NetInfoStateType.none,\n details: null,\n };\n return state;\n }\n\n // Otherwise try to return detailed information\n const isConnectionExpensive = connection.saveData;\n const type: NetInfoStateType = connection.type\n ? typeMapping[connection.type]\n : isConnected\n ? NetInfoStateType.other\n : NetInfoStateType.unknown;\n\n if (type === NetInfoStateType.bluetooth) {\n const state: NetInfoBluetoothState = {\n ...baseState,\n isConnected: true,\n type,\n details: {\n isConnectionExpensive,\n },\n };\n return state;\n } else if (type === NetInfoStateType.cellular) {\n const state: NetInfoCellularState = {\n ...baseState,\n isConnected: true,\n type,\n details: {\n isConnectionExpensive,\n cellularGeneration:\n effectiveTypeMapping[connection.effectiveType] || null,\n carrier: null,\n },\n };\n return state;\n } else if (type === NetInfoStateType.ethernet) {\n const state: NetInfoEthernetState = {\n ...baseState,\n isConnected: true,\n type,\n details: {\n isConnectionExpensive,\n ipAddress: null,\n subnet: null,\n },\n };\n return state;\n } else if (type === NetInfoStateType.wifi) {\n const state: NetInfoWifiState = {\n ...baseState,\n isConnected: true,\n type,\n details: {\n isConnectionExpensive,\n ssid: null,\n bssid: null,\n strength: null,\n ipAddress: null,\n subnet: null,\n frequency: null,\n linkSpeed: null,\n rxLinkSpeed: null,\n txLinkSpeed: null,\n },\n };\n return state;\n } else if (type === NetInfoStateType.wimax) {\n const state: NetInfoWimaxState = {\n ...baseState,\n isConnected: true,\n type,\n details: {\n isConnectionExpensive,\n },\n };\n return state;\n } else if (type === NetInfoStateType.none) {\n const state: NetInfoNoConnectionState = {\n ...baseState,\n isConnected: false,\n isInternetReachable: false,\n type,\n details: null,\n };\n return state;\n } else if (type === NetInfoStateType.unknown) {\n const state: NetInfoUnknownState = {\n ...baseState,\n isConnected,\n isInternetReachable: null,\n type,\n details: null,\n };\n return state;\n }\n\n const state: NetInfoOtherState = {\n ...baseState,\n isConnected: true,\n type: NetInfoStateType.other,\n details: {\n isConnectionExpensive,\n },\n };\n return state;\n};\n\nconst handlers: ((state: NetInfoNativeModuleState) => void)[] = [];\nconst nativeHandlers: (() => void)[] = [];\n\nconst RNCNetInfo: NetInfoNativeModule = {\n addListener(type, handler): void {\n switch (type) {\n case DEVICE_CONNECTIVITY_EVENT: {\n const nativeHandler = (): void => {\n handler(getCurrentState());\n };\n\n if (connection) {\n connection.addEventListener('change', nativeHandler);\n } else {\n if (isWindowPresent) {\n window.addEventListener('online', nativeHandler, false);\n window.addEventListener('offline', nativeHandler, false);\n }\n }\n\n // Remember handlers\n handlers.push(handler);\n nativeHandlers.push(nativeHandler);\n\n break;\n }\n }\n },\n\n removeListeners(type, handler): void {\n switch (type) {\n case DEVICE_CONNECTIVITY_EVENT: {\n // Get native handler\n const index = handlers.indexOf(handler);\n const nativeHandler = nativeHandlers[index];\n\n if (connection) {\n connection.removeEventListener('change', nativeHandler);\n } else {\n if (isWindowPresent) {\n window.removeEventListener('online', nativeHandler);\n window.removeEventListener('offline', nativeHandler);\n }\n }\n\n // Remove handlers\n handlers.splice(index, 1);\n nativeHandlers.splice(index, 1);\n\n break;\n }\n }\n },\n\n async getCurrentState(requestedInterface): Promise<NetInfoNativeModuleState> {\n return getCurrentState(requestedInterface);\n },\n\n configure(): void {\n return;\n },\n};\n\nexport default RNCNetInfo;\n"]} |