amplifyconfig top-level constant Null safety

Implementation

const amplifyconfig = ''' {
    "UserAgent": "aws-amplify-cli/2.0",
    "Version": "1.0",
    "analytics": {
        "plugins": {
            "awsPinpointAnalyticsPlugin": {
                "pinpointAnalytics": {
                    "appId": "289f927c630c481db967c7b4cca258e2",
                    "region": "ap-northeast-2"
                },
                "pinpointTargeting": {
                    "region": "ap-northeast-2"
                }
            }
        }
    },
    "api": {
        "plugins": {
            "awsAPIPlugin": {
                "FarmersHandsClientAPI": {
                    "endpointType": "REST",
                    "endpoint": "https://c9fcyetk28.execute-api.ap-northeast-2.amazonaws.com/dev",
                    "region": "ap-northeast-2",
                    "authorizationType": "AWS_IAM"
                },
                "FarmersHandsGroupAPI": {
                    "endpointType": "GraphQL",
                    "endpoint": "https://oktt2syjljaephxiieqpqspo3i.appsync-api.ap-northeast-2.amazonaws.com/graphql",
                    "region": "ap-northeast-2",
                    "authorizationType": "AMAZON_COGNITO_USER_POOLS"
                }
            }
        }
    },
    "auth": {
        "plugins": {
            "awsCognitoAuthPlugin": {
                "UserAgent": "aws-amplify-cli/0.1.0",
                "Version": "0.1.0",
                "IdentityManager": {
                    "Default": {}
                },
                "CredentialsProvider": {
                    "CognitoIdentity": {
                        "Default": {
                            "PoolId": "ap-northeast-2:f2cc4f2a-1278-4378-9eb1-78e40d8b50b2",
                            "Region": "ap-northeast-2"
                        }
                    }
                },
                "CognitoUserPool": {
                    "Default": {
                        "PoolId": "ap-northeast-2_5lqj3NzSD",
                        "AppClientId": "4cok0gfe8m865kiiq4kbamev4h",
                        "Region": "ap-northeast-2"
                    }
                },
                "Auth": {
                    "Default": {
                        "authenticationFlowType": "USER_SRP_AUTH",
                        "socialProviders": [],
                        "usernameAttributes": [],
                        "signupAttributes": [
                            "BIRTHDATE",
                            "NAME",
                            "PHONE_NUMBER"
                        ],
                        "passwordProtectionSettings": {
                            "passwordPolicyMinLength": 8,
                            "passwordPolicyCharacters": []
                        },
                        "mfaConfiguration": "OFF",
                        "mfaTypes": [
                            "SMS"
                        ],
                        "verificationMechanisms": [
                            "PHONE_NUMBER"
                        ]
                    }
                },
                "PinpointAnalytics": {
                    "Default": {
                        "AppId": "289f927c630c481db967c7b4cca258e2",
                        "Region": "ap-northeast-2"
                    }
                },
                "PinpointTargeting": {
                    "Default": {
                        "Region": "ap-northeast-2"
                    }
                },
                "AppSync": {
                    "Default": {
                        "ApiUrl": "https://oktt2syjljaephxiieqpqspo3i.appsync-api.ap-northeast-2.amazonaws.com/graphql",
                        "Region": "ap-northeast-2",
                        "AuthMode": "AMAZON_COGNITO_USER_POOLS",
                        "ClientDatabasePrefix": "FarmersHandsGroupAPI_AMAZON_COGNITO_USER_POOLS"
                    }
                },
                "S3TransferUtility": {
                    "Default": {
                        "Bucket": "farmershandsuserapp95473534e7a347b6a75e340a233e163022-dev",
                        "Region": "ap-northeast-2"
                    }
                }
            }
        }
    },
    "storage": {
        "plugins": {
            "awsS3StoragePlugin": {
                "bucket": "farmershandsuserapp95473534e7a347b6a75e340a233e163022-dev",
                "region": "ap-northeast-2",
                "defaultAccessLevel": "guest"
            }
        }
    }
}''';