Config planning fails for shared variables in IaC file

[voidmain]

The new IaC fails on all shared variables, even when it is linked to a valid project, in a valid environment, with a valid shared variable.

Example:

Project: Foo
Env: production
Shared value: BAR="some-value"

railway.ts:

import { defineRailway, github, project, service } from "railway/iac";

const REGION = "us-east4-eqdc4a";

export default defineRailway((ctx) => {
  const baz = service("baz", {
    env: {
      BAR: ctx.shared.BAR
    },
    healthcheck: "/api/status",
    replicas: { [REGION]: 1 },
    source: github("some-repo", { branch: "main" }),
  });

  return project("Project Name", {
    resources: [baz],
  });
});

This fails with an error something like this:

node failed to evaluate IaC file.
file:///Users/user/dev/project/.railway/railway.ts?t=1787413491413:24
      BAR: ctx.shared.BAR

TypeError: Cannot read properties of undefined (reading 'BAR')
    at file:///Users/user/dev/project/.railway/railway.ts?t=1787413491413:24:37
    at file:///Users/user/dev/project/[eval1]:10:56

Node.js v26.7.0

Claude suggested what looked like a horrible hack of creating a context if there wasn't one, but I've tested that and it seems to delete the shared variables in Railway in some cases.

This shouldn't fail as it is documented here: https://docs.railway.com/infrastructure-as-code/reference#environment-variables

This should pull from the project/environment and check that the variable exists (which it does) and then happily continue with the planning stage.

Unless I'm doing something seriously wrong, this is basically a showstopper for IaC since any secrets can't be managed outside of the Typescript file.

[sergiocampama]

Also seeing that ctx.shared is undefined.