Speedup build and CI testing

[dsmilkov]

Speedup our travis CI build and testing by 2X.

This run took: 8 min 33 sec link
Yesterday's run took: 16min 53 sec link

Details

• We used to re-compile our codebase 10 times over (every time you call ts-node and karma)
• Now we compile it only once (yarn build) and run node and karma using the browserify plugin, which circumvents the typescript compilation
• Also speedup the vscode build task by 1.5X by passing --noEmit to typescript to skip generating build artifacts.

This change is 

[nsthorat]

Reviewed 5 of 6 files at r1, 1 of 1 files at r2.
Reviewable status: complete! 1 of 1 approvals obtained (waiting on @dsmilkov and @nsthorat)

---

package.json, line 54 at r2 (raw file):

    "coverage": "KARMA_COVERAGE=1 karma start --browsers='Chrome' --singleRun",
    "test": "karma start",
    "run-browserstack": "karma start --travis --reporters='dots,BrowserStack' --hostname='bs-local.com'",

should we put these all inside karma.conf.js just so they're not in 2 places?

[dsmilkov]

Reviewable status: complete! 1 of 1 approvals obtained

---

package.json, line 54 at r2 (raw file):

Previously, nsthorat (Nikhil Thorat) wrote…

should we put these all inside karma.conf.js just so they're not in 2 places?

Done.