feat: coverage support

package.json

@@ -6,10 +6,11 @@
   "main": "dist/index.js",
   "typings": "src/index.ts",
   "scripts": {
-    "test": "npm run eslint && npm run tscheck && npm run test:r",
-    "test:r": "npm run mocha -- src/*.spec.ts",
-    "mocha": "node -r ts-node/register/transpile-only node_modules/mocha/bin/_mocha",
-    "test:w": "npm run mocha -- --watch-extensions ts --watch src/**/*.spec.ts",
+    "test": "npm run eslint && npm run tscheck && npm run test:cov",
+    "_mocha": "node -r ts-node/register/transpile-only node_modules/mocha/bin/_mocha",
+    "test:r": "mocha -r ts-node/register/transpile-only src/*.spec.ts",
+    "test:w": "mocha -r ts-node/register/transpile-only --watch-extensions ts --watch src/**/*.spec.ts",
+    "test:cov": "nyc mocha src/**/*.spec.ts",
     "test:d": "node --inspect-brk -r ts-node/register/transpile-only node_modules/mocha/bin/_mocha --no-timeouts --watch-extensions ts --watch src/**/*.spec.ts",
     "tscheck": "echo tscheck... && tsc --noEmit",
     "tscheck:w": "npm run tscheck -- --watch",
@@ -41,6 +42,7 @@
     "eslint-plugin-unicorn": "^6.0.0",
     "mocha": "^5.2.0",
     "npm-run-all": "^4.1.3",
+    "nyc": "^13.0.1",
     "rimraf": "^2.6.2",
     "semantic-release": "^15.9.11",
     "ts-node": "^7.0.1",
@@ -60,6 +62,28 @@
     "url": "https://github.com/unlight/node-package-starter.git"
   },
   "keywords": [],
+  "nyc": {
+    "include": [
+      "src/**/*.ts",
+      "src/**/*.tsx"
+    ],
+    "exclude": [
+      "**/*.d.ts",
+      "src/**/*.spec.ts"
+    ],
+    "extension": [
+      ".ts",
+      ".tsx"
+    ],
+    "require": [
+      "ts-node/register/transpile-only"
+    ],
+    "reporter": [
+      "text"
+    ],
+    "sourceMap": true,
+    "instrument": true
+  },
   "release": {
     "generateNotes": {
       "writerOpts": {