(I didn't see an issue for this, so I guess it might be Windows specific?)

Given the following in a fileDemo.res whereTest is the moduleTest.res

Js.log(Test.x)

When doing CTRL + Mouse left click onTest I get:

Unable to open 'Test.res': Unable to read file '\\c:\Projects\rescript-project-template\src\Test.res' (Unknown (FileSystemError): Error: UNKNOWN: unknown error, stat '\\c:\Projects\rescript-project-template\src\Test.res').

I tried debugging in and got that in the definition case

I get the uri being sent

to be
result.definition.uri =file://c:/Projects/rescript-project-template/src/Test.res
msg.params.textDocument.uri =file:///c%3A/Projects/rescript-project-template/src/Demo.res.

If I add an extra slash to theresult.definition.uri so that it becomesfile:/// (like the other uri) then it jumps to the definition properly.

I don't know what the best way to resolve this is, though.