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ReactStaticSite

The ReactStaticSite construct is a higher level CDK construct that makes it easy to create a React single page app. It provides a simple way to build and deploy the site to an S3 bucket; setup a CloudFront CDN for fast content delivery; and configure a custom domain for the website URL.

It's designed to work with static sites built with Create React App. It allows you to automatically set environment variables in your React app directly from the outputs of your SST app. And it can also create a .d.ts type definition file for the environment variables.

The ReactStaticSite construct internally extends the StaticSite construct with the following pre-configured defaults.

  • indexPage is set to index.html.
  • errorPage is set to redirect_to_index_page. So error pages are redirected to the index page.
  • buildCommand is npm run build.
  • buildOutput is the build folder in your React app.
  • fileOptions sets the cache control to max-age=0,no-cache,no-store,must-revalidate for HTML files; and max-age=31536000,public,immutable for JS/CSS files.

Examples

Minimal Config

Deploys a Create React App in the path/to/src directory.

new ReactStaticSite(stack, "ReactSite", {
path: "path/to/src",
});

Environment variables

The ReactStaticSite construct allows you to set the environment variables in your React app based on outputs from other constructs in your SST app. So you don't have to hard code the config from your backend. Let's look at how.

Create React App supports setting build time environment variables. In your JS files this looks like:

src/App.js
console.log(process.env.REACT_APP_API_URL);
console.log(process.env.REACT_APP_USER_POOL_CLIENT);

And in your HTML files:

public/index.html
<p>Api endpoint is: %REACT_APP_API_URL%</p>

You can pass these in directly from the construct.

new ReactStaticSite(stack, "ReactSite", {
path: "path/to/src",
environment: {
REACT_APP_API_URL: api.url,
REACT_APP_USER_POOL_CLIENT: auth.cognitoUserPoolClient.userPoolClientId,
},
});

Where api.url or auth.cognitoUserPoolClient.userPoolClientId are coming from other constructs in your SST app.

While deploying

On sst deploy, the environment variables will first be replaced by placeholder values, {{ REACT_APP_API_URL }} and {{ REACT_APP_USER_POOL_CLIENT }}, when building the React app. And after the referenced resources have been created, the Api and User Pool in this case, the placeholders in the HTML and JS files will then be replaced with the actual values.

While developing

To use these values while developing, run sst start to start the Live Lambda Development environment.

npx sst start

Then in your React app to reference these variables, add the sst-env package.

npm install --save-dev @serverless-stack/static-site-env

And tweak the React start script to:

package.json
"scripts": {
"start": "sst-env -- react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},

Now you can start your React app as usualy and it'll have the environment variables from your SST app.

npm run start

There are a couple of things happening behind the scenes here:

  1. The sst start command generates a file with the values specified by ReactStaticSite's environment prop.
  2. The sst-env CLI will traverse up the directories to look for the root of your SST app.
  3. It'll then find the file that's generated in step 1.
  4. It'll load these as environment variables before running the start command.
note

sst-env only works if the React app is located inside the SST app or inside one of its subdirectories. For example:

/
sst.json
react-app/

Custom domains

You can also configure custom domains for your React app. SST supports domains that are hosted either on Route 53 or externally.

Using the basic config for a domain hosted on Route 53.

new ReactStaticSite(stack, "ReactSite", {
path: "path/to/src",
customDomain: "domain.com",
});

For more custom domain examples, check out the StaticSite examples.

More examples

For more examples, refer to the StaticSite snippets.

Constructor

new ReactStaticSite(scope, id, props)

Parameters

Properties

An instance of ReactStaticSite has the following properties.

bucketArn

Type : string

The ARN of the internally created S3 Bucket.

bucketName

Type : string

The name of the internally created S3 Bucket.

customDomainUrl

Type : undefined | string

If the custom domain is enabled, this is the URL of the website with the custom domain.

distributionDomain

Type : string

The domain name of the internally created CloudFront Distribution.

distributionId

Type : string

The ID of the internally created CloudFront Distribution.

url

Type : string

The CloudFront URL of the website.

cdk.bucket

Type : Bucket

The internally created CDK Bucket instance.

cdk.certificate?

Type : ICertificate

cdk.distribution

Type : Distribution

The internally created CDK Distribution instance.

cdk.hostedZone?

Type : IHostedZone

The Route 53 hosted zone for the custom domain.