Pulumi TypeScript: define infrastructure as typed code with real programming constructs

HCL-based tools like Terraform lack true programming constructs: no functions with logic, no for loops over computed values, no native type safety, and no IDE autocomplete. Complex infrastructure configurations become hard to abstract and test.

Use Pulumi with TypeScript to define infrastructure using real language features. Resources are classes, outputs are typed promises, and you can use loops, conditionals, and functions naturally.

import * as aws from "@pulumi/aws";
import * as pulumi from "@pulumi/pulumi";

const config = new pulumi.Config();
const environment = config.require("environment");

// Create multiple subnets with a loop
const azs = ["us-east-1a", "us-east-1b", "us-east-1c"];
const subnets = azs.map((az, i) =>
  new aws.ec2.Subnet(`subnet-${az}`, {
    vpcId: vpc.id,
    availabilityZone: az,
    cidrBlock: `10.0.${i + 1}.0/24`,
    tags: { Environment: environment, Name: `subnet-${az}` },
  })
);

// Conditional resource creation
const eip = environment === "prod"
  ? new aws.ec2.Eip("nat-eip", {})
  : undefined;

Pulumi's programming model enables abstraction, reuse, and testing that are difficult or impossible in HCL. TypeScript provides compile-time type checking, IDE support, and access to the full npm ecosystem.

Teams comfortable with TypeScript who need richer abstraction than HCL provides