Transparent go-to-def doesn't work in VS

[RyanCavanaugh]

TypeScript Version: master

Search Terms: visual studio declaration source map to go to definition

Code

foo.ts

bar;

bar.d.ts

declare var bar;

bar.d.ts.map

(sourcemap saying "go to ../src/bar")

../src/bar.ts

var bar;

Expected behavior: Goes to the def

Actual behavior: Cannot navigate to symbol under caret

Playground Link: N/A

Related Issues: #22658

Root cause here is that we are eagerly deserializing the references into DocumentItems, but there is no Document for bar.ts in foo.ts's project

[RyanCavanaugh]

Currently mitigated by telling VS about the .d.ts file and providing the .ts location in an alternate field