is Fastboot not support with Ember Data 5.0?

[st-h]

I am upgrading an app that uses fastboot to Ember 5. As soon as I update Ember Data to 5.0, I see the following error in fastboot mode (regular mode works fine). Reverting Ember data to 4.x resolves the issue.

ReferenceError: AbortController is not defined
    at RequestManager.request (/var/folders/k0/gr21dt897rl512t16pr6fvwr0000gn/T/broccoli-70505mNywZsvAQIwR/out-734-broccoli_merge_trees/assets/addon-tree-output/@ember-data/request/index.js:722:1)
    at Store.request (/var/folders/k0/gr21dt897rl512t16pr6fvwr0000gn/T/broccoli-70505mNywZsvAQIwR/out-734-broccoli_merge_trees/assets/addon-tree-output/@ember-data/store/-private.js:3854:1)
    at Store.queryRecord (/var/folders/k0/gr21dt897rl512t16pr6fvwr0000gn/T/broccoli-70505mNywZsvAQIwR/out-734-broccoli_merge_trees/assets/addon-tree-output/@ember-data/store/-private.js:4810:1)

I found this issue #8475 with seems to be related. However, when I apply to proposed solution the error changes. Now I get that:

ReferenceError: XMLHttpRequest is not defined
    at eval (webpack://__ember_auto_import__/./node_modules/pretender/dist/pretender.es.js?:263:1886)
    at new Promise (<anonymous>)
    at fetch (webpack://__ember_auto_import__/./node_modules/pretender/dist/pretender.es.js?:263:1705)
    at Account._fetchRequest (/var/folders/k0/gr21dt897rl512t16pr6fvwr0000gn/T/broccoli-75229j4B3CjfqdF6a/out-734-broccoli_merge_trees/assets/addon-tree-output/@ember-data/adapter/rest.js:942:1)
    at Account.ajax (/var/folders/k0/gr21dt897rl512t16pr6fvwr0000gn/T/broccoli-75229j4B3CjfqdF6a/out-734-broccoli_merge_trees/assets/addon-tree-output/@ember-data/adapter/rest.js:908:1)

How do I make ember data 5.0 compatible with fastboot?

[runspired]

ReferenceError: AbortController is not defined

This is a bug in fastboot, but which apps can address by adding the global like you found.

ReferenceError: XMLHttpRequest is not defined

EmberData does nothing with XMLHttpRequest, and this stack trace suggests you are using pretender (which is used by mirage) which is probably where you need to be looking for a fix. I don't think node ever implemented this as a global but if it has then you could patch the same as AbortController, but it is also a bit surprising to not be using Fetch at this point.