flow-coverage-report (facebook#11545)

* Added 'flow-coverage-report' package for discussion

* Aded flow-coverage command and configuration file

* Moved FLow coverage config file to scripts/flow/coverage-config

* Moved Flow coverage config back to root as dotfile

.flowcoverage

@@ -0,0 +1,17 @@
+{
+  "excludeGlob": [
+    "node_modules/**",
+    "packages/**/__mocks__/*.js",
+    "packages/**/__tests__/*.js"
+  ],
+  "includeGlob": [
+    "packages/**/src/**/*.js"
+  ],
+  "outputDir": "flow-coverage",
+  "threshold": 90,
+  "type": [
+    "html",
+    "json",
+    "text"
+  ]
+}

.gitignore

@@ -8,6 +8,7 @@ __benchmarks__
 build/
 remote-repo/
 coverage/
+flow-coverage/
 .module-cache
 fixtures/dom/public/react-dom.js
 fixtures/dom/public/react.js

package.json

@@ -62,6 +62,7 @@
     "fbjs-scripts": "^0.6.0",
     "filesize": "^3.5.6",
     "flow-bin": "^0.61.0",
+    "flow-coverage-report": "^0.4.0",
     "git-branch": "^0.3.0",
     "glob": "^6.0.4",
     "glob-stream": "^6.1.0",
@@ -99,6 +100,7 @@
   },
   "scripts": {
     "build": "npm run version-check && node ./scripts/rollup/build.js",
+    "flow-coverage": "flow-coverage-report --config ./.flowcoverage",
     "linc": "node ./scripts/tasks/linc.js",
     "lint": "node ./scripts/tasks/eslint.js",
     "lint-build": "node ./scripts/rollup/validate/index.js",