can’t set property 'family' of MongooseModule options about mongoose

[vincentdd]

I found my mistake.I should call forRoot like this:

MongooseModule.forRoot(mongoDB, {
    useNewUrlParser: true,
    useCreateIndex: true,
    useFindAndModify: false,
    autoIndex: false, // Don't build indexes
    reconnectTries: Number.MAX_VALUE, // Never stop trying to reconnect
    reconnectInterval: 500, // Reconnect every 500ms
    poolSize: 10, // Maintain up to 10 socket connections
    // If not connected, return errors immediately rather than waiting for reconnect
    bufferMaxEntries: 0,
    connectTimeoutMS: 10000, // Give up initial connection after 10 seconds
    socketTimeoutMS: 45000, // Close sockets after 45 seconds of inactivity
    family: 4 // Use IPv4, skip trying IPv6
  })

sorry ,I'm freshman for TS