AlterableComposableSchema is the same as ComposableSchema, except that it invokes events. We introduced it in 4.x because we wanted to be very strict about backwards compatibility.
Unfortunately this caused bugs like 🐛 Sort extensions by priority and presave extension key. Active where we forgot to update AlterableComposableSchema.
Look at AlterableComposableSchema and see how it is a duplicate
1. Keep AlterableComposableSchema for backwards compatiility, but it will an empty class extending ComposableSchema.
2. Move all code to ComposableSchema, invoke events there.
Merge request
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Active
5.0
Code
Can this be back ported to 4.x? - GraphQL Compose is on the AlterableComposableSchema and I'd prefer to jump into line without dropping support for 4.x immediately.