fix failure on first-run and auto-apply package.json updates #2279
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This fixes #2264 (comment) and also addresses automatically adding
exports
to package.json, since they're both in the same function.The problem with first-run failures was that Resolver expects to get constructed after any prebuilding is done. We were constructing it in ensureAppSetup before the prebuild.
This class of bug is harder to see now that prebuilds are optional. ResolverLoader will happily construct a Resolver with no prebuilt output present. But the resulting Resolver won't know anything about any v1 addons that were present.