# Generate types using GitHub Actions

End-to-end type safety across client, server, and database.

You can use the Supabase CLI to automatically generate Typescript definitions from your Postgres database. You can then pass these definitions to your `supabase-js` client and get end-to-end type safety across client, server, and database.

Inside your repository, create a new file inside the `.github/workflows` folder called `generate-types.yml`. Copy this snippet inside the file, and the action will run whenever a new PR is created:

## Verify types

```yaml
name: 'generate-types'
on:
  pull_request:

jobs:
  build: 
    runs-on: ubuntu-latest
    steps:
        - uses: supabase/setup-cli@v1
          with:
            version: latest
        - run: supabase init
        - run: supabase db start
        - name: Verify generated types match Postgres schema
          run: |
            supabase gen types typescript --local > schema.gen.ts
            if ! git diff --ignore-space-at-eol --exit-code --quiet schema.gen.ts; then
              echo "Detected uncommitted changes after build. See status below:"
              git diff
              exit 1
            fi
```

## More resources

- Using supabase-js with type definitions: [Typescript Support](/docs/reference/javascript/typescript-support)