vcfvct / cloudform

TypeScript-based imperative way to define AWS CloudFormation templates

cloudform

TypeScript-based imperative way to define AWS CloudFormation templates

Read the introductory blog post

Installation

npm install --save-dev cloudform

Usage

1. Define your AWS CloudFormation template in a TypeScript file, for example template.ts:

import cloudform, {Fn, Refs, EC2, StringParameter, ResourceTag} from "cloudform"

cloudform({
    Description: 'My template',
    Parameters: {
        DeployEnv: new StringParameter({
            Description: 'Deploy environment name',
            AllowedValues: ['stage', 'production']
        })
    },
    Mappings: {
        DeploymentConfig: {
            stage: {
                InstanceType: 't2.small'
            },
            production: {
                InstanceType: 't2.large'
            }
        }
    },
    Resources: {
        VPC: new EC2.VPC({
            CidrBlock: NetworkingConfig.VPC.CIDR,
            EnableDnsHostnames: true,
            Tags: [
                new ResourceTag('Application', Refs.StackName),
                new ResourceTag('Network', 'Public'),
                new ResourceTag('Name', Fn.Join('-', [Refs.StackId, 'VPC']))
            ]
        }),
        Instance: new EC2.Instance({
            InstanceType: Fn.FindInMap('DeploymentConfig', Fn.Ref('DeployEnv'), 'InstanceType'),
            ImageId: 'ami-a85480c7'
        }).dependsOn('VPC')
    }
})

See also example/example.ts.

2. Run cloudform path/to/your/template.ts to generate the CloudFormation template as JSON.

It makes sense to define it in your npm scripts and run within your build or deployment pipeline, for example:

"scripts"
  // ...
  "generate-cloudformation-template": "cloudform path/to/your/template > template.aws"
}

API

The types are generated automatically from the AWS-provided schema file, so cloudform supports all the types available in AWS CloudFormation.

The simple convention is used – all the AWS types’ namespaces are available directly as exports from the cloudform package. All the resources within this package are available inside. This way EC2.VPC object from our example translates into AWS::EC2::VPC type we can find in CloudFormation documentation. All the properties also match one-to-one, including casing.

Supported namespaces are:

ApiGateway
ApplicationAutoScaling
Athena
AutoScaling
Batch
CertificateManager
CloudFormation
CloudFront
CloudTrail
CloudWatch
CodeBuild
CodeCommit
CodeDeploy
CodePipeline
Cognito
Config
DAX
DMS
DataPipeline
DirectoryService
DynamoDB
EC2
ECR
ECS
EFS
EMR
ElastiCache
ElasticBeanstalk
ElasticLoadBalancing
ElasticLoadBalancingV2
Elasticsearch
Events
GameLift
GuardDuty
IAM
IoT
KMS
Kinesis
KinesisAnalytics
KinesisFirehose
Lambda
Logs
OpsWorks
RDS
Redshift
Route53
S3
SDB
SNS
SQS
SSM
StepFunctions
WAF
WAFRegional
WorkSpaces

All Intrinsic Tunctions are available within Fn namespace:

Fn.Base64(value: Value<string>)
Fn.FindInMap(mapName: Value<string>, topLevelKey: Value<string>, secondLevelKey: Value<string>)
Fn.GetAtt(logicalNameOfResource: Value<string>, attributeName: Value<string>)
Fn.GetAZs(region?: Value<string>)
Fn.ImportValue(sharedValueToImport: Value<any>)
Fn.Join(delimiter: Value<string>, values: List<any>)
Fn.Select(index: Value<number>, listOfObjects: List<any>)
Fn.Split(delimiter: Value<string>, sourceString: Value<string>)
Fn.Sub(string: Value<string>, vars [key: string]: Value<any> })
Fn.Ref(logicalName: Value<string>)

// condition functions
Fn.And(condition: List<Condition>)
Fn.Equals(left: any, right: any)
Fn.If(conditionName: Value<string>, valueIfTrue: any, valueIfFalse: any)
Fn.Not(condition: Condition)
Fn.Or(condition: List<Condition>)

All the Pseudo Parameters are there, too:

Ref.AccountId
Ref.NotificationARNs
Ref.NoValue
Ref.Partition
Ref.Region
Ref.StackId
Ref.StackName
Ref.URLSuffix

Licence

MIT