Config

The sst.config.ts file is used to configure your SST app and its resources.

$config(input: Config): Config

You specify it using the $config function. This takes an object of type Config.

sst.config.ts

/// <reference path="./.sst/platform/config.d.ts" />

export default $config({
  // Your app's config
  app(input) {
    return {
      name: "my-sst-app",
      home: "aws"
    };
  },
  // Your app's resources
  async run() {
    const bucket = new sst.aws.Bucket("MyBucket");

    // Your app's outputs
    return {
      bucket: bucket.name
    };
  },
  // Optionally, your app's Console config
  console: {
    autodeploy: {
      runner: { compute: "large" }
    }
  }
});

The Config object takes:

1. app — Your config
2. run — Your resources
3. console — Optionally, your app’s Console config

The app function is evaluated right when your app loads. It’s used to define the app config and its providers.

Note

You need TypeScript 5 to see the types in your config.

You can add Pulumi code in the run function not the app function. While the run function is where you define your resources using SST or Pulumi’s components.

The run function also has access to a list of Global $ variables and functions. These serve as the context for your app config.

Caution

Do not import the provider packages in your sst.config.ts.

Since SST manages importing your provider packages, it’s recommended not to add any imports in your sst.config.ts.

---

.env

Your .env and .env.<stage> files are loaded as environment variables in your config. They need to be in the same directory as your sst.config.ts.

.env

MY_ENV_VAR=hello

And are available as process.env in both your app and run functions.

sst.config.ts

process.env.MY_ENV_VAR

The .env file takes precedence over .env.<stage>. So if you have a .env and a .env.dev file, the values in the .env file will be used.

Note

You need to restart sst dev for changes in your .env files to take effect.

Make sure the stage name in your .env.<stage> matches the stage your app is running on.

---

Config

console?

Type Object

• autodeploy Object

  • runner?

  • target?

Configure how your app works with the SST Console.

console.autodeploy

Type Object

Default Auto-deploys branches and PRs.

Auto-deploys your app when you git push to your repo. Uses AWS CodeBuild in your account to run the build.

To get started, first make sure to set up Autodeploy. Specifically, you need to configure an environment with the stage and AWS account you want to auto-deploy to.

Now when you git push to a branch, pull request, or tag, the following happens:

1. The stage name is generated based on the autodeploy.target callback.
   1. If there is no callback, the stage name is a sanitized version of the branch or tag.
   2. If there is a callback but no stage is returned, the deploy is skipped.
2. The runner config is generated based on the autodeploy.runner. Or the defaults are used.
3. The stage is matched against the environments in the Console to get the AWS account and any environment variables for the deploy.
4. The deploy is run based on the above config.

This only applies only to git events. If you trigger a deploy through the Console, you are asked to sepcify the stage you want to deploy to. So in this case, it skips step 1 from above and does not call autodeploy.target.

Both target and runner are optional and come with defaults, so you don’t need to configure anything. But you can customize them.

sst.config.ts

console: {
  autodeploy: {
    target(event) {
      if (
        event.type === "branch" &&
        event.branch === "main" &&
        event.action === "pushed"
       ) {
        return { stage: "production" };
      }
    },
    runner(stage) {
      if (stage === "production") return { timeout: "3 hours" };
    }
  }
}

For example, here we are only auto-deploying to the production stage when you git push to the main branch. We are also setting the timeout to 3 hours for the production stage.

console.autodeploy.runner?

Type Runner | (input: RunnerInput) => Runner

Configure the runner that will run the build. By default it uses the following config:

{
  runner: {
    engine: "codebuild",
    architecture: "x86_64",
    compute: "medium",
    timeout: "1 hour"
  }
}

Most of these are optional and come with defaults. But you can configure them.

{
  runner: { timeout: "3 hours" }
}

You can also configure it based on the stage that’s being deployed. Let’s say you want to use the defaults for all stages except for production.

{
  runner(stage) {
    if (stage === "production") return { timeout: "3 hours" };
  }
}

Aside from the above, you can also have the deploys run inside a VPC.

{
  runner: {
    vpc: {
      id: "vpc-0be8fa4de860618bb",
      securityGroups: ["sg-0399348378a4c256c"],
      subnets: ["subnet-0b6a2b73896dc8c4c", "subnet-021389ebee680c2f0"]
    }
  }
}

Or configure files or directories to be cached.

{
  runner: {
    cache: {
      paths: ["node_modules", "/path/to/cache"]
    }
  }
}

A runner is a AWS CodeBuild project and an IAM Role. This is created in your account.

Once a runner is created, it can be used to run multiple builds of the same machine config concurrently. Runners are also shared across all apps in the same account and region.

Note

You are only charged for the number of build minutes that you use.

If a runner with a given config has been been previously created, it’ll be reused. The Console will also automatically remove runners that have not been used for more than 7 days.

You are not charged for the number of runners you have, only for the number of build minutes that you use. The pricing is based on the machine config used. Learn more about CodeBuild pricing.

console.autodeploy.target?

target(input)

Parameters

• input BranchEvent | TagEvent | PullRequestEvent

Returns undefined | Target

Defines the stage the app will be auto-deployed to.

When a git event is received, Autodeploy will run the target function with the git event. This function should return the stage the app will be deployed to. Or undefined if the deploy should be skipped.

Tip

Return undefined to skip the deploy.

The stage that is returned is then compared to the environments set in the app settings in the Console. If the stage matches an environment, the stage will be deployed to that environment. If no matching environment is found, the deploy will be skipped.

Note

You need to configure an environment in the Console to be able to deploy to it.

Currently, only git events for branches, pull requests, and tags are supported.

Tip

This is not called when you manually trigger a deploy through the Console.

This config only applies to git events. If you trigger a deploy through the Console, you are asked to sepcify the stage you want to deploy to. In this case, and when you redeploy a manual deploy, the target function is not called.

By default, this is what the target function looks like:

{
  target(event) {
    if (event.type === "branch" && event.action === "pushed") {
      return {
        stage: event.branch
          .replace(/[^a-zA-Z0-9-]/g, "-")
          .replace(/-+/g, "-")
          .replace(/^-/g, "")
          .replace(/-$/g, "")
      };
    }

    if (event.type === "pull_request") {
      return { stage: `pr-${event.number}` };
    }
  }
}

So for a:

• branch: The stage name is a sanitized version of the branch name. When a branch is removed, the stage is not removed.
• pull request: The stage name is pr-<number>. When a pull request is closed, the stage is removed.

Tip

Git events to tags are not auto-deployed by default.

Git events to tags are not auto-deployed by default. You can change this by adding it to your config.

{
  target(event) {
    if (event.type === "tag" && event.action === "pushed") {
      return {
        stage: "tag-" + event.tag
          .replace(/[^a-zA-Z0-9-]/g, "-")
          .replace(/-+/g, "-")
          .replace(/^-/g, "")
          .replace(/-$/g, "")
      };
    }
  }
}

Here, similar to the branch event, we are sanitizing the tag name to generate the stage. Just make sure to configure the environment for these tag stages in the Console.

If you don’t want to auto-deploy for a given event, you can return undefined. For example, to skip any deploys to the staging stage.

sst.config.ts

target(event) {
  if (event.type === "branch" && event.branch === "staging") return;
  if (event.type === "branch" && event.branch === "main" && event.action === "pushed") {
    return { stage: "production" };
  }
}

app

app(input)

Parameters

• input AppInput

Returns App

The config for your app. It needs to return an object of type App. The app function is evaluated when your app loads.

Caution

You cannot define any components or resources in the app function.

Here’s an example of a simple app function.

sst.config.ts

app(input) {
  return {
    name: "my-sst-app",
    home: "aws",
    providers: {
      aws: true,
      cloudflare: {
        accountId: "6fef9ed9089bb15de3e4198618385de2"
      }
    },
    removal: input.stage === "production" ? "retain" : "remove"
  };
},

run

run()

Returns Promise<void | Record<string, any>>

An async function that lets you define the resources in your app.

Note

You can use SST and Pulumi components only in the run function.

You can optionally return an object that’ll be displayed as the output in the CLI.

For example, here we return the name of the bucket we created.

sst.config.ts

async run() {
  const bucket = new sst.aws.Bucket("MyBucket");

  return {
    bucket: bucket.name
  };
}

This will display the following in the CLI on sst deploy and sst dev.

bucket: bucket-jOaikGu4rla

These outputs are also written to a .sst/output.json file after every successful deploy. It contains the above outputs in JSON.

.sst/output.json

{"bucket": "bucket-jOaikGu4rla"}

App

home

Type “aws” | “cloudflare” | “local”

The provider SST will use to store the state for your app. The state keeps track of all your resources and secrets. The state is generated locally and backed up in your cloud provider.

Currently supports AWS, Cloudflare and local.

Tip

SST uses the home provider to store the state for your app. If you use the local provider it will be saved on your machine. You can see where by running sst version.

If you want to configure the aws or cloudflare home provider, you can:

{
  home: "aws",
  providers: {
    aws: {
      region: "us-west-2"
    }
  }
}

name

Type string

The name of the app. This is used to prefix the names of the resources in your app.

Caution

If you change the name of your app, it’ll redeploy your app with new resources. The old resources will be orphaned.

This means that you don’t want to change the name of your app without removing the old resources first.

{
  name: "my-sst-app"
}

protected?

Type boolean

Prevents sst remove from being executed on this stage.

Prevent the “production” stage from being removed.

{
  protected: input.stage === "production"
}

providers?

Type Record<string, any>

Default The home provider.

The providers that are being used in this app. This allows you to use the resources from these providers in your app.

{
  providers: {
    aws: "6.27.0",
    cloudflare: "5.37.1"
  }
}

Check out the full list in the Directory.

Tip

You’ll need to run sst install after you update the providers in your config.

If you don’t set a provider it uses your home provider with the default config. So if you set home to aws, it’s the same as doing:

{
  home: "aws",
  providers: {
    aws: "6.27.0"
  }
}

You can also configure the provider props. Here’s the config for some common providers:

• AWS
• Cloudflare

For example, to change the region for AWS.

{
  providers: {
    aws: {
      region: "us-west-2"
    }
  }
}

removal?

Type “remove” | “retain” | “retain-all”

Default “retain”

Configure how your resources are handled on sst remove:

• remove: Remove all your resources on remove.
• retain: Retains S3 buckets and DynamoDB tables, and remove all other resources.
• retain-all: Retains all your resources on remove.

Tip

If you change your removal policy, you’ll need to deploy your app once for it to take effect.

Retain resources if it’s the production stage, otherwise remove all resources.

{
  removal: input.stage === "production" ? "retain" : "remove"
}

version?

Type string

Default The latest version of SST.

The version of SST supported by the app. The CLI will fail any commands if the version does not match.

Tip

Useful in CI where you don’t want it to automatically deploy with a new version of SST.

Takes a specific version.

version: "3.2.49"

Also supports semver ranges.

version: ">= 3.2.49"

AppInput

stage

Type string

The stage this app is running on. This is a string that can be passed in through the CLI.

Caution

Changing the stage will redeploy your app to a new stage with new resources. The old resources will still be around in the old stage.

If not passed in, it’ll use the username of your local machine, or prompt you for it.

BranchEvent

A git event for when a branch is updated or deleted. For example:

{
  type: "branch",
  action: "pushed",
  repo: {
    id: 1296269,
    owner: "octocat",
    repo: "Hello-World"
  },
  branch: "main",
  commit: {
    id: "b7e7c4c559e0e5b4bc6f8d98e0e5e5e5e5e5e5e5",
    message: "Update the README with new information"
  },
  sender: {
    id: 1,
    username: "octocat"
  }
}

action

Type “pushed” | “removed”

The type of the git action.

• pushed is when you git push to a branch
• removed is when a branch is removed

branch

Type string

The name of the branch the event is coming from.

commit

Type Object

• id

• message

Info about the commit in the event. This might look like:

{
  id: "b7e7c4c559e0e5b4bc6f8d98e0e5e5e5e5e5e5e5",
  message: "Update the README with new information"
}

commit.id

Type string

The ID of the commit.

commit.message

Type string

The commit message.

repo

Type Object

• id

• owner

• repo

The Git repository the event is coming from. This might look like:

{
  id: 1296269,
  owner: "octocat",
  repo: "Hello-World"
}

repo.id

Type number

The ID of the repo. This is usually a number.

repo.owner

Type string

The name of the owner or org the repo to belongs to.

repo.repo

Type string

The name of the repo.

sender

Type Object

• id

• username

The user that generated the event. For example:

{
  id: 1,
  username: "octocat"
}

sender.id

Type number

The ID of the user.

sender.username

Type string

The username of the user.

type

Type “branch”

The git event type, for the BranchEvent it’s branch.

PullRequestEvent

A git event for when a pull request is updated or deleted. For example:

{
  type: "pull_request",
  action: "pushed",
  repo: {
    id: 1296269,
    owner: "octocat",
    repo: "Hello-World"
  },
  number: 1347,
  base: "main",
  head: "feature",
  commit: {
    id: "b7e7c4c559e0e5b4bc6f8d98e0e5e5e5e5e5e5e5",
    message: "Update the README with new information"
  },
  sender: {
    id: 1,
    username: "octocat"
  }
}

action

Type “pushed” | “removed”

The type of the git action.

• pushed is when you git push to the base branch of the PR
• removed is when the PR is closed or merged

base

Type string

The base branch of the PR. This is the branch the code is being merged into.

commit

Type Object

• id

• message

Info about the commit in the event. This might look like:

{
  id: "b7e7c4c559e0e5b4bc6f8d98e0e5e5e5e5e5e5e5",
  message: "Update the README with new information"
}

commit.id

Type string

The ID of the commit.

commit.message

Type string

The commit message.

head

Type string

The head branch of the PR. This is the branch the code is coming from.

number

Type number

The pull request number.

repo

Type Object

• id

• owner

• repo

The Git repository the event is coming from. This might look like:

{
  id: 1296269,
  owner: "octocat",
  repo: "Hello-World"
}

repo.id

Type number

The ID of the repo. This is usually a number.

repo.owner

Type string

The name of the owner or org the repo to belongs to.

repo.repo

Type string

The name of the repo.

sender

Type Object

• id

• username

The user that generated the event. For example:

{
  id: 1,
  username: "octocat"
}

sender.id

Type number

The ID of the user.

sender.username

Type string

The username of the user.

type

Type “pull_request”

The git event type, for the PullRequestEvent it’s pull_request.

Runner

architecture?

Type “x86_64” | “arm64”

Default x86_64

The x86_64 machine uses the al2/standard/5.0 build image. While arm64 uses the al2/aarch64/standard/3.0 image instead.

You can also configure what’s used in the image:

• Node

  To specify the version of Node you want to use in your build, you can use the .node-version, .nvmrc, or use the engine field in your package.json.

  package.json

  package.json

  {
    engine: {
      node: "20.15.1"
    }
  }

  node-version

  .node-version

  20.15.1

  nvmrc

  .nvmrc

  20.15.1

• Package manager

  To specify the package manager you want to use you can configure it through your package.json.

  package.json

  {
    packageManager: "pnpm@8.6.3"
  }

Feel free to get in touch if you want to use your own build image or configure what’s used in the build image.

The architecture of the build machine.

cache?

Type Object

• paths

Paths to cache as a part of the build. By default the .git directory is cached.

The given list of files and directories will be saved to the cache at the end of the build. And they will be restored at the start of the build process.

{
  cache: {
    paths: ["node_modules", "/path/to/cache"]
  }
}

The relative paths are for caching files inside your repo. While the absolute path is for any global caches.

To clear the cache, you can trigger a new deploy using the Force deploy option in the Console.

cache.paths

Type string[]

The paths to cache. These are relative to the root of the repository.

By default, the .git directory is always cached.

compute?

Type “small” | “medium” | “large” | “xlarge” | “2xlarge”

Default medium

The compute size of the build environment.

For x86_64, the following compute sizes are supported:

• small: 3 GB, 2 vCPUs
• medium: 7 GB, 4 vCPUs
• large: 15 GB, 8 vCPUs
• xlarge: 70 GB, 36 vCPUs
• 2xlarge: 145 GB, 72 vCPUs

For arm64 architecture, the following compute sizes are supported:

• small: 4 GB, 2 vCPUs
• medium: 8 GB, 4 vCPUs
• large: 16 GB, 8 vCPUs
• xlarge: 64 GB, 32 vCPUs
• 2xlarge: 96 GB, 48 vCPUs

To increase the memory used by your Node.js process in the build environment, you’ll want to set the NODE_OPTIONS environment variable to --max-old-space-size=xyz. Where xyz is the memory size in MB. By default, this is set to 1.5 GB.

Read more about the CodeBuild build environments.

engine

Type “codebuild”

The service used to run the build. Currently, only AWS CodeBuild is supported.

timeout?

Type “${number} minute” | “${number} minutes” | “${number} hour” | “${number} hours”

Default 1 hour

The timeout for the build. It can be from 5 minutes to 36 hours.

vpc?

Type Object

• id

• securityGroups

• subnets

The VPC to run the build in. If provided, the build environment will have access to resources in the VPC.

This is useful for building Next.js apps that might make queries to your database as a part of the build process.

You can get these from the outputs of the Vpc component your are using or from the Console.

{
  vpc: {
    id: "vpc-0be8fa4de860618bb",
    subnets: ["subnet-0be8fa4de860618bb"],
    securityGroups: ["sg-0be8fa4de860618bb"]
  }
}

vpc.id

Type string

The ID of the VPC.

vpc.securityGroups

Type string[]

The security groups to run the build in.

vpc.subnets

Type string[]

The subnets to run the build in.

RunnerInput

stage

Type string

The stage the deployment will be run in.

TagEvent

A git event for when a tag is created or deleted. For example:

{
  type: "tag",
  action: "pushed",
  repo: {
    id: 1296269,
    owner: "octocat",
    repo: "Hello-World"
  },
  tag: "v1.5.2",
  commit: {
    id: "b7e7c4c559e0e5b4bc6f8d98e0e5e5e5e5e5e5e5",
    message: "Update the README with new information"
  },
  sender: {
    id: 1,
    username: "octocat"
  }
}

action

Type “pushed” | “removed”

The type of the git action.

• pushed is when you create a tag
• removed is when a tag is removed

commit

Type Object

• id

• message

Info about the commit in the event. This might look like:

{
  id: "b7e7c4c559e0e5b4bc6f8d98e0e5e5e5e5e5e5e5",
  message: "Update the README with new information"
}

commit.id

Type string

The ID of the commit.

commit.message

Type string

The commit message.

repo

Type Object

• id

• owner

• repo

The Git repository the event is coming from. This might look like:

{
  id: 1296269,
  owner: "octocat",
  repo: "Hello-World"
}

repo.id

Type number

The ID of the repo. This is usually a number.

repo.owner

Type string

The name of the owner or org the repo to belongs to.

repo.repo

Type string

The name of the repo.

sender

Type Object

• id

• username

The user that generated the event. For example:

{
  id: 1,
  username: "octocat"
}

sender.id

Type number

The ID of the user.

sender.username

Type string

The username of the user.

tag

Type string

The name of the tag. For example, v1.5.2.

type

Type “tag”

The git event type, for the TagEvent it’s tag.

Target

stage

Type string

The stage the app will be deployed to.