Merge plugin generates identical const variables more than once

[qbunt]

Expected Behavior

• When running a merge export plugin CLI command, the script generated should not have any const values more than once, especially naming them the same thing as doing so would be a basic violation of the JS runtime.

Actual Behavior

When running the CLI with the merge plugin, as below

yarn dlx contentful space migration --space-id [redacted] --environment-id master stage-master.cjs

The generated migration script contains multiple variables that are named the same thing and immediately fail in a scripted deployment, as they are a syntax error.

Possible Solution

Before writing the file to disk, check all const variables for uniqueness across the script.

Steps to Reproduce

1. Generate a simple content model that contains a model with a name like toolLanguage
2. Generate another simple model that's named language for instance
3. Generate a third simple model that's named tool and make a reference relationship between tool and language called toolLanguage
4. Generate a migration script from that environment into a new environment
5. See constant variable name clashing

Context

We attempted to generate a migration script that had closely related naming values and the generated script had multiple conflicting constant names. As this could be running in a headless environment, this should be strictly guarded against. This occurred, in our case, inside a Github action run.

Environment

• Node v20
• Yarn v4.1.1
• Ubuntu-22.04
• Github Action worker v2.316.1

[qbunt]

Anyone care to take a look at this? This issue borked a production build, thought that maybe generating syntactically invalid JS would be a bigger deal 🤷