First step to TypeScript upgrade

[JustinBeckwith]

First steps towards #503. This simply renames all the files (including generated ones) to *.ts, and makes any changes necessary to get the build and tests to pass. I am going to update #503 with the full list of steps we need to take here.

• npm test succeeds
• Pull request has been squashed into 1 commit
• I did NOT manually make changes to anything in apis/
• Code coverage does not decrease (if any source code was changed)
• Appropriate JSDoc comments were updated in source code (if applicable)
• Appropriate changes to readme/docs are included in PR

I chose to hand modify apis/ to mollify the TypeScript compiler, and because I didn't want to complicate the PR with schema changes.

[codecov-io]

Codecov Report

Merging #731 into master will decrease coverage by 15.13%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #731       +/-   ##
===========================================
- Coverage   94.71%   79.58%   -15.14%     
===========================================
  Files          20        8       -12     
  Lines        1382      240     -1142     
  Branches        0       53       +53     
===========================================
- Hits         1309      191     -1118     
+ Misses         73       30       -43     
- Partials        0       19       +19

Impacted Files	Coverage Δ
lib/auth/computeclient.ts	100% <ø> (ø)
lib/utils.ts	100% <ø> (ø)
lib/transporters.ts	100% <ø> (ø)
lib/auth/jwtclient.ts	100% <ø> (ø)
lib/discovery.ts	67.64% <100%> (ø)
lib/apirequest.ts	97.29% <100%> (ø)
lib/googleapis.ts	78.18% <100%> (ø)
lib/generator_utils.ts	60% <100%> (ø)
... and 1 more

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[JustinBeckwith]

@matthewloring since @ofrobots is out, can you take a look?

[lukesneeringer]

This simply renames all the files (including generated ones) to *.ts

This seems wrong to me unless the thing that generates the code has been updated to spit out *.ts files. Hand-edits to autogen code need to not happen. (And yes, renaming the file is totally a hand-edit.)

[JustinBeckwith]

@lukesneeringer I updated the generators and templates to emit *.ts files, re-ran the generator, and ensured that it all worked. The problem is that regenerating the ts files is non-deterministic. The PR would include surface changes, and about 200k lines across all generated files to review.

It's really up to you guys. I'm trying to limit the scope and improve the readability of the PR - but I'm happy to throw a watermelon over the fence :)

[lukesneeringer]

If you updated the generator, that resolves my complaint.

[matthewloring]

It looks like a few files (auth and some others) did not go through the s/module.exports/export change. Why were these omitted?

[jmdobry]

I'm going to test this branch against our Node.js samples that use google-api-nodejs-client

[jmdobry]

Tested against our googleapis samples in the nodejs-docs-samples repo.