Linkable env vars

Pass SST link env vars to a native aws.ecs.TaskDefinition container using sst.Linkable.env(). This lets Resource.MyResource work at runtime in compute not managed by SST.

// Create an SST bucket
const bucket = new sst.aws.Bucket("MyBucket");

// Create a custom linkable
const linkable = new sst.Linkable("MyLinkable", {
  properties: {
    foo: "bar",
  },
});

// Create VPC and ECS cluster using native AWS resources
const vpc = new aws.ec2.Vpc("Vpc", { cidrBlock: "10.0.0.0/16" });
const subnet = new aws.ec2.Subnet("Subnet", {
  vpcId: vpc.id,
  cidrBlock: "10.0.0.0/24",
});
const cluster = new aws.ecs.Cluster("Cluster");

// Linkable.env() returns a Record<string, string>, but ECS expects
// environment as an array of { name, value } objects
const environment = sst.Linkable.env([bucket, linkable]).apply((env) =>
  Object.entries(env).map(([name, value]) => ({ name, value })),
);

const taskDefinition = new aws.ecs.TaskDefinition("TaskDefinition", {
  family: $interpolate`${$app.name}-${$app.stage}`,
  cpu: "256",
  memory: "512",
  networkMode: "awsvpc",
  requiresCompatibilities: ["FARGATE"],
  containerDefinitions: $jsonStringify([
    {
      name: "app",
      image: "public.ecr.aws/docker/library/node:20-slim",
      essential: true,
      environment,
    },
  ]),
});

new aws.ecs.Service("Service", {
  cluster: cluster.arn,
  taskDefinition: taskDefinition.arn,
  desiredCount: 0,
  launchType: "FARGATE",
  networkConfiguration: {
    subnets: [subnet.id],
  },
});

View the full example.