Terraform inbuilt function in CDKTF

vishalailani · January 22, 2022, 9:39am

Hello,
Do we have any documentation or example of how to use Terraform inbuilt functions in CDKTF in TS ? for example File function to read file.

tbugfinder · January 22, 2022, 10:47am

This docs might help.

github.com

hashicorp/terraform-cdk/blob/8e83c6703ed6f5615898b1c4f6c4e5b06ee7445a/docs/working-with-cdk-for-terraform/terraform-functions.md

# Terraform Functions

Terraform provides a set of functions that can be used through the CDK for Terraform.

```ts
import { Fn } from "cdktf";

new vpc() = new VPC(this, "vpc", {});
new LoadBalancer(this, "lb", {
  name: "main-lb",
  subnet: Fn.cidrsubnet(Fn.element(vpc.listOfSubnets, 0), 4, 2),
});
```

To explore the functionality either check out the [Terraform Documentation](https://www.terraform.io/docs/language/functions/index.html) or use your editor autocompletion on the `Fn` object. The functions can handle normal and [token](./tokens.md) values and will return either tokenized values or `IResolvable`s.

## When to use

- For calculating new values based on runtime values (resource / module / data source outputs)

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Terraform inbuilt function in CDKTF

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