Pass in a callback to load the TypeScript config file
Pass in a callback to load the TypeScript config file

Summary:
If the config file is in a .kindex, trying to read it
from the local filesystem won't work.

Reviewers: evmar

Reviewed By: evmar

Subscribers: #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1575

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