Cannot Import TypeScript Module In Test File

Link to bug demonstration repository.

https://github.com/dawsonc623/nyc-bug-demo

Expected Behavior

Running yarn test should yield passing tests with 100% coverage.

Observed Behavior

Running yarn test fails with the following errors and reports 0% Statement and Line coverage (Branch and Funcs are at 100% presumably because there are none in the file).

TSError: ⨯ Unable to compile TypeScript:
src/app/foo.ts(1,212): error TS2351: Cannot use 'new' with an expression whose type lacks a call or construct signature.
src/app/foo.ts(1,656): error TS2339: Property 'hash' does not exist on type '{ path: string; statementMap: { "0": { start: { line: number; column: number; }; end: { line: number; column: number; }; }; }; fnMap: {}; branchMap: {}; s: { "0": number; }; f: {}; b: {}; _coverageSchema: string; }'.

There is also a massive stack trace, but it does not seem particularly useful to post the whole thing here.

Forensic Information

Operating System: Ubuntu 18.04.2 LTS on Windows 10 via the Windows Subsystem for Linux Environment Information: https://gist.github.com/dawsonc623/5d175ea45c6c5fb5359dc11bfeb05df3

[ljsustainas]

use ts-node/register/transpile-only instead from docs https://istanbul.js.org/docs/tutorials/typescript/

--require ts-node/register # replace with ts-node/register/transpile-only if you have custom types

[dawsonc623]

@coreyfarrell Fantastic news! Thanks for tackling this.