build: Prevent publish from non master branch

Author: Federico Zivolo

package.json

@@ -28,7 +28,8 @@
     "test:jest": "jest",
     "test:eslint": "eslint src",
     "prepare": "npm run build",
-    "precommit": "pretty-quick --staged && test"
+    "precommit": "pretty-quick --staged && test",
+    "prepublish": "git-branch-is master"
   },
   "jest": {
     "setupTestFrameworkScriptFile": "<rootDir>jest.setup.js",
@@ -84,6 +85,7 @@
     "eslint-plugin-react": "^7.7.0",
     "flow-bin": "^0.69.0",
     "flow-copy-source": "^1.3.0",
+    "git-branch-is": "^0.1.0",
     "jest": "^22.4.3",
     "outy": "^0.1.2",
     "parcel-bundler": "^1.6.2",

yarn.lock

@@ -2940,6 +2940,12 @@ getpass@^0.1.1:
   dependencies:
     assert-plus "^1.0.0"
 
+git-branch-is@^0.1.0:
+  version "0.1.0"
+  resolved "https://registry.yarnpkg.com/git-branch-is/-/git-branch-is-0.1.0.tgz#bef5a6113a30f4007e7c002f9ba4cf37925c171f"
+  dependencies:
+    commander "^2.9.0"
+
 glob-base@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/glob-base/-/glob-base-0.3.0.tgz#dbb164f6221b1c0b1ccf82aea328b497df0ea3c4"