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A CDK AwsCustomResource wrapper which checks that its specified SDK functions exists
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Checked AWS Custom Resource

This is a wrapper around the AWS CDK's AwsCustomResource.

By default, if you specify an SDK function for AwsCustomResource which doens't exist, CDK will still generate a CloudFormation template for you and attempt to deploy it, just to eventually fail.

This wrapper resolves that by complaining when you give it SDK services or actions which don't exist. The price is fairly small: your CDK project will depend on aws-sdk.


npm install --save checked-aws-custom-resource


This class is used identically to AwsCustomResource. For example:

import { CheckedAwsCustomResource } from "checked-aws-custom-resource";

new CheckedAwsCustomResource(stack, "Resource", {
  onCreate: {
    service: "RDS",
    action: "modifyDBCluster",
    parameters: {
      DBClusterIdentifier: db.ref,
      EnableHttpEndpoint: true
    physicalResourceId: `resourceId`

However, if the service or action is does not exist, e.g the action could be miscapitalized as "ModifyDBCluster", the class will throw an exception during instantiation. For example:

$ cdk synth MyStack
ModifyDBCluster is not a function in AWS.RDS
You can’t perform that action at this time.