Use ts-mocha to run tests

[kenashcraft]

This gives good stack traces during tests and means we can skip the compile step. Converts all packages except:

• opencensus-nodejs: has tests that expect .js files/syntax
• opencensus-instrumentation-redis: I couldn't figure out what was going wrong
• opencensus-exporter-ocagent: Depends on the compilation step to copy files around

[mayurkale22]

@kenashcraft thanks for the contribution. Please rebase the PR, this should fix the build. We have already removed the dependencies on @types/pkg-dir and pkg-dir #438.

[codecov-io]

Codecov Report

Merging #444 into master will decrease coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #444      +/-   ##
==========================================
- Coverage      95%   94.83%   -0.17%     
==========================================
  Files         147      146       -1     
  Lines        9566     9739     +173     
  Branches      680      692      +12     
==========================================
+ Hits         9088     9236     +148     
- Misses        478      503      +25

Impacted Files	Coverage Δ
test/test-instana.ts	88.46% <0%> (-11.54%)	⬇️
src/detect-resource.ts	92.85% <0%> (-7.15%)	⬇️
src/common-utils.ts	95.83% <0%> (-4.17%)	⬇️
src/tracecontext-format.ts	96.42% <0%> (-1.4%)	⬇️
...rontend/page-handlers/traceconfigz.page-handler.ts	69.56% <0%> (-1.27%)	⬇️
test/test-jaeger-format.ts	95.38% <0%> (-1.23%)	⬇️
src/tags/propagation/binary-serializer.ts	95.23% <0%> (-1.13%)	⬇️
...ages-frontend/page-handlers/tracez.page-handler.ts	60.81% <0%> (-0.53%)	⬇️
test/test-detect-resource.ts	99.51% <0%> (-0.49%)	⬇️
src/index.ts	100% <0%> (ø)	⬆️
... and 52 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ac0ef77...09398ed. Read the comment docs.

[mayurkale22]

I think we should still keep this and add into unit test workflow. Something like below in .circleci/config.yml WDYT?

   - run:
        name: Compile code
        command: npm run compile

[kenashcraft]

It looks like that config is for the entire repo. That would cause all of the other packages to run the compile step twice. Is that ok and/or should I change all of the other packages to use ts-mocha?

[mayurkale22]

I would prefer to change all packages to use ts-mocha. Also, does it make sense to remove dependencies on mocha and @types/mocha after this? @draffensperger any thoughts?

[kenashcraft]

No, we can't remove the dependencies. The ts-mocha page says we need them: https://www.npmjs.com/package/ts-mocha

[mayurkale22]

Ok SG.

[kenashcraft]

@mayurkale22 Looks like I finally got all of the tests passing. I did my best to ensure I was changing only the files that needed to be changed, but please double check before we merge.

[mayurkale22]

Can you please create an issue to track remaining packages.

[kenashcraft]

Added issue #447.

[mayurkale22]

Optional: Can we move these configuration options in .nycrc, later on we can add coverage threshold and other options. Also this will make package.json more cleaner. WDYT?

[kenashcraft]

The official docs didn't offer that as an option: https://istanbul.js.org/docs/tutorials/typescript/ . I don't know if it is supported.

[mayurkale22]

Ok. I referred this link https://github.com/istanbuljs/nyc#configuring-nyc