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From this article you can learn how to setup a Pulumi JavaScript Stack in Spacelift
In order to follow along with this article, you'll need an AWS account.
Start with forking the Pulumi examples repo, we'll be setting up an example directory from there, namely aws-js-webserver.
Now let's open Spacelift and create a new Stack, choose the examples repo you just forked. In the second step you'll have to change multiple default values:
Set the project root to aws-js-webserver, as we want to run Pulumi in this subdirectory only.
Add one before init script: npm install, which will install all necessary dependencies, before initializing Pulumi itself. The outputs will be persisted in the workspace and be there for the Planning and Applying phases.
Set the runner image to public.ecr.aws/spacelift/runner-pulumi-javascript:latest 
Pinning to a specific Pulumi version is possible too, using a tag like v2.15.4 - you can see the available versions here.
Define behavior.
In the third step, choose Pulumi as your Infrastructure as Code vendor. You'll have to choose:
A state backend, aka login URL. This can be a cloud storage bucket, like s3://pulumi-state-bucket, but it can also be a Pulumi Service endpoint. 
A stack name, which is how the state for this stack will be namespaced in the state backend. Best to write something close to your stack name, like my-javascript-pulumi-spacelift-stack.
Configure backend.
You can use https://api.pulumi.com as the Login URL to use the official Pulumi state backend. You'll also need to provide your Pulumi access token through the PULUMI_ACCESS_TOKEN environment variable.
You'll now have to set up the AWS integration for the Stack, as is described in AWS.
Go into the Environment tab in your screen, add an AWS_REGION environment variable and set it to your region of choice, i.e. eu-central-1.
Configure environment.
You can now trigger the Run manually in the Stack view, after the planning phase is over, you can check the log to see the planned changes.
Pending confirmation.
Confirm the run to let it apply the changes, after applying it should look like this:
Applied
We can see the publicHostName stack output. If we try to curl it, lo and behold:
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~> curl ec2-18-184-240-9.eu-central-1.compute.amazonaws.com
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Hello, World!
Copied!
In order to clean up, open the Tasks tab, and perform pulumi destroy --non-interactive --yes there.
Performing cleanup task.
Which will destroy all created resources.
Destruction complete.
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