OSS-899 shipped 81 strict-mode errors to consumers because nothing checked what
the published .d.cts files reach for. validate-dts-ambient.ts checks their shape;
this checks their imports against the one thing that matters -- whether someone
who installed this package and nothing else can resolve them.
Flags devDependencies, optional peers, dependencies whose types live in a
devDependency @types package, relative imports of JS-only bundler chunks, and an
explicit ban on graphql-yoga, whose types drag lru-cache@10 into every consumer
program. Currently red on 18 real violations; the fixes follow.
Benjamin Taylor