Test

Overhaul legacy support and middleware creation; fix linting. #957

Job	Run time
@dataplan/pg tests / build (12, 20.x)	3m 24s
PostGraphile v4 queries tests (exported as graphql-js) / build (12, 20.x)	16m 43s
PostGraphile mutation tests / build (12, 20.x)	3m 13s
PostGraphile mutation tests (exported as graphql-js) / build (12, 20.x)	8m 52s
PostGraphile mutation tests (exported as typeDefs) / build (12, 20.x)	7m 26s
PostGraphile polymorphic query tests / build (12, 20.x)	3m 3s
PostGraphile polymorphic query tests (exported as graphql-js) / build (12, 20.x)	7m 13s
PostGraphile polymorphic query tests (exported as typeDefs) / build (12, 20.x)	6m 13s
PostGraphile v4 queries tests / build (12, 20.x)	3m 37s
PostGraphile v4 queries tests (exported as typeDefs) / build (12, 20.x)	12m 20s
PostGraphile schema tests / build (12, 20.x)	6m 3s
Small package tests / build (12, 20.x)	2m 57s
	1h 21m 4s

Provide feedback