Add coverage reports using nyc (#110)

This adds a `npm run coverage` script.

It does not introduce Travis + coveralls.io/codecov.io
integration yet, this is just the first step aimed at
getting coverage reports locally.

Has two reporters enabled: `text-summary` (to console) and
`html` (detailed output written to `./coverage/` dir).

`instrument` is required for coverage to work

`sourceMap` is required for proper source highlighting.

`cache` seems to be broken in ts-node setup, so it is
explicitly disabled.

All *.ts files from `src/` directory are analyzed,
excluding tests.

Author: ChALkeR

.gitignore

@@ -7,3 +7,5 @@ yalc.lock
 .yalc/
 demo/train-*
 *.log
+.nyc_output/
+coverage/

.nycrc

@@ -0,0 +1,19 @@
+{
+    "extension": [
+      ".ts"
+    ],
+    "reporter": [
+      "html",
+      "text-summary"
+    ],
+    "include": [
+      "src/**/*"
+    ],
+    "exclude": [
+      "src/run_tests.ts",
+      "src/**/*_test.ts"
+    ],
+    "cache": false,
+    "sourceMap": true,
+    "instrument": true
+}

package.json

@@ -17,6 +17,7 @@
     "build-npm": "./scripts/build-npm.sh",
     "lint": "tslint -p . -t verbose",
     "test": "ts-node src/run_tests.ts",
+    "coverage": "nyc ts-node src/run_tests.ts",
     "link-local": "yalc link",
     "publish-local": "yarn prep && yarn build && yalc push"
   },
@@ -28,6 +29,7 @@
     "@types/rimraf": "~2.0.2",
     "clang-format": "~1.2.2",
     "jasmine": "~3.1.0",
+    "nyc": "^12.0.2",
     "ts-node": "~5.0.0",
     "tslint": "~5.9.1",
     "typescript": "~2.7.2",