Manually bundling GTM integration causes error

[vrugtehagel]

When manually bundling @segment/analytics-next together with the GTM plugin from @segment/analytics.js-integration-google-tag-manager, a runtime error is thrown;

ReferenceError: global is not defined

Somewhere deep down, this global variable is used to refer to globalThis, but this is Node-specific. Currently, I'm using a workaround that does something along the lines of

globalThis.global = globalThis;
const { default: GTM } = await import('@segment/analytics.js-integration-google-tag-manager');

This fixes the error and the bundle works properly. Of course, however, I shouldn't have to do this.

The issue originates from @segmentio/fmt and I took the liberty of opening a pull request: segmentio/fmt#3. This issue is mostly for visibility.