chore: add npm version script (#6168)

* chore: update versions

* Update README.md

* docs: add changelog for 4.2.0 (#6165)

* chore: update versions

* chore: update versions

* chore: set versions of packages to 4.2.0

The versions of packages to reflect in `master` to reflect the `latest` official release in `npm`.
Bumping up versions will execute in CI job through the `npm --no-git-tag-version version minor` command.
This is to unify the release process across the `NativeScript`, `nativescript-angular` and `nativescript-dev-webpack` repositories.

* chore: add npm version script

* docs: add release section to CONTRIBUTING.md

* chore: update npm version script

* chore(deps): update to widgets@next

* chore(deps): update to widgets@next

* docs(CONTRIBUTING): update Releasing new versions section

Add a note that these instructions concern NativeScript Core Team Members.

CONTRIBUTING.md

@@ -8,6 +8,7 @@ Here are some guides on how to do that:
  - [Requesting New Features](#features)
  - [Submitting a PR](#pr)
  - [Commit Message Guidelines](#commit-messages)
+ - [Releasing new versions](#release)
 
 ##  <a name="coc"></a> Code of Conduct
 Help us keep a healthy and open community. We expect all participants in this project to adhere to the [NativeScript Code Of Conduct](https://github.com/NativeScript/codeofconduct).
@@ -209,3 +210,44 @@ If you want to contribute, but you are not sure where to start - look for [issue
 
 
 [commit-message-format]: https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit#
+
+## <a name="release"></a> Releasing new versions
+
+Instructions how to release a new version for **NativeScript Core Team Members**.
+
+1. Execute `npm install` to install dependencies:
+```bash
+npm install
+```
+
+2. Add the following to your `.npmrc`:
+```
+tag-version-prefix=""
+message="release: cut the %s release"
+```
+
+3. Create new branch based on `master`:
+```bash
+git checkout -b username/release-version
+```
+
+4. Execute [`npm version`](https://docs.npmjs.com/cli/version) to bump the version of `tns-platform-declarations`:
+```bash
+cd tns-platform-declarations
+npm --no-git-tag-version version [patch|minor|major]
+cd ..
+```
+
+5. Execute [`npm version`](https://docs.npmjs.com/cli/version) to bump the version of `tns-core-modules`, tag the release and update the CHANGELOG.md:
+```bash
+cd tns-core-modules
+npm version [patch|minor|major]
+cd ..
+```
+
+6. Push all the changes to your branch and open a pull request:
+```bash
+git push --set-upstream origin username/release-version --tags
+```
+
+7. Create `release` branch after the pull request is merged to `master` and publish the packages built on CI to `npm`.

tns-core-modules/package.json

@@ -1,7 +1,7 @@
 {
   "name": "tns-core-modules",
   "description": "Telerik NativeScript Core Modules",
-  "version": "4.3.0",
+  "version": "4.2.0",
   "homepage": "https://www.nativescript.org",
   "repository": {
     "type": "git",
@@ -32,6 +32,9 @@
     "@types/node": "~7.0.5",
     "tns-platform-declarations": "*"
   },
+  "scripts": {
+    "version": "conventional-changelog -p angular -i ../CHANGELOG.md -s && git add ../CHANGELOG.md"
+  },
   "nativescript": {
     "platforms": {
       "ios": "4.0.0",

tns-platform-declarations/package.json

@@ -1,6 +1,6 @@
 {
   "name": "tns-platform-declarations",
-  "version": "4.3.0",
+  "version": "4.2.0",
   "description": "Platform-specific TypeScript declarations for NativeScript for accessing native objects",
   "main": "",
   "scripts": {