Add documentation about releasing and prepack npm hook to build the project (#106)

Author: andrea-guarino-sonarsource

docs/RELEASING.md

@@ -0,0 +1,8 @@
+## Releasing npm package
+
+* Install or upgrade `np` package globally (`npm install -g np`)
+* Login to npm with `npm adduser`
+* Create new branch, e.g. `1.2.0`, add upstream
+* Run this to publish package `np --any-branch`
+
+N.B. As the project must be compiled to JS before publishing, we added a `prepack` npm hook to take care of this.

package.json

@@ -20,7 +20,8 @@
     "ruling": "ts-node ruling/index.ts",
     "typecheck": "tsc -p tsconfig.json",
     "lint": "eslint --ext js,ts src tests ruling/index.ts",
-    "precommit": "lint-staged && yarn typecheck"
+    "precommit": "lint-staged && yarn typecheck",
+    "prepack": "yarn build"
   },
   "peerDependencies": {
     "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0"