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• Use a meaningful title for the pull request. Include the name of the package modified.
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• Provide a URL to documentation or source code which provides context for the suggested changes: https://github.com/mochajs/mocha/blob/master/lib/runner.js#L92

Other remarks:
I wasn't sure how mocha-tests.ts was being consumed. I've appeneded some dtslint tests to the end, they seem to work (and fail when they should too)