typesMapLocation not forwarded from Session to ProjectService

[kyliau]

TypeScript Version: 2.8.0-dev.20180315

Search Terms:
typesMapLocation

// A *self-contained* demonstration of the problem follows...
// Test this by running `tsc` on the command-line, rather than through another build tool such as Gulp, Webpack, etc.

Bring up tsserver with argument --typesMapLocation /path/to/typesMap.json and turn on logging.
Inspect the logs, and see that Provided types map file "/path/to//typesMap.json" doesn't exist even though the file is valid.

Expected behavior:
typesMap.json should be correctly located and error not shown in logs.

Actual behavior:
Error message about non-existent typeMaps.json shown in the logs.

Playground Link:

Related Issues: