Runtimes

Forge functions currently support two classes of runtime execution environments:

Node.js runtime
Legacy runtime (deprecated)

To specify your Specifying your function runtime is done by defining the runtime field in your app manifest.

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app:
  id: <app-id>
  runtime:
    name: nodejs18.x | nodejs20.x | nodejs22.x | sandbox

Adding the runtime.name property to the manifest file will not trigger a major version upgrade. As such, deploying this change alone will automatically install it on all sites within the same environment (for example, production).