build: implemented script that checks npm access before publishing the package

Author: antipin

package.json

@@ -17,7 +17,8 @@
         "lint:styles": "stylelint 'src/**/*.s(a|c)ss'",
         "test": "jest --config scripts/test/jest.config.js",
         "test:coverage": "jest --config scripts/test/jest.config.js --coverage",
-        "prepublishOnly": "npm test && npm run lint:ci && npm run lint:styles && npm run build:prod",
+        "check-npm-publish-access": "sh scripts/check-npm-publish-access/check-npm-publish-access.sh",
+        "prepublishOnly": "npm run check-npm-publish-access && npm run test && npm run lint:ci && npm run lint:styles && npm run build:prod",
         "coveralls": "cat ./coverage/lcov.info | node node_modules/.bin/coveralls",
         "release": "standard-version -t ''"
     },

scripts/check-npm-publish-access/check-npm-publish-access.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+
+# Exit immediately if any command exits with a non-zero status
+set -e;
+
+# Checking for dependencies
+if ! [ -x "$(command -v npm)" ]; then
+  echo 'Error: "npm" is not installed.'
+  exit 1
+fi
+if ! [ -x "$(command -v grep)" ]; then
+  echo 'Error: "grep" is not installed.'
+  exit 1
+fi
+
+# Checking if the list of repo npm owners includes current npm user.
+#
+# `npm owner ls` prints a list of npm users, who have access to the current repo
+# in the following format:
+# > username1 <someuser@emain.com>
+# > username2 <auser@emain.com>
+# > username3 <theusername@emain.com>
+#
+# `npm whoami` prints current npm username
+# > username2
+npm_package_name=$(node -p "require('./package.json').name")
+npm_current_user=$(npm whoami)
+if npm owner ls | grep --quiet "^${npm_current_user}\s"; then
+    echo "Access to '${npm_package_name}' repository was confirmed for '${npm_current_user}'."
+    exit 0
+else
+    echo "${npm_current_user} doesn't have an access to the repo '${npm_package_name}'."
+    exit 1
+fi
+