Migrate to yarn (#38)

* Migrate to yarn

* Mention yarn in README

* Use only node 10 to satisfy yarn install

* Add ignore-engine flag and restore 12.x node

* Rename action steps

* Update README

.github/workflows/release.yml

@@ -12,12 +12,11 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: '12.x'
+          node-version: '10.x'
       - name: Deploy a stable release to NPM
         run: |
           echo '//registry.npmjs.org/:_authToken=${NPM_TOKEN}' >> .npmrc
-          npm whoami
-          npm ci
+          yarn install --frozen-lockfile
           npm publish --access public
         env:
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/test.yml

@@ -17,24 +17,23 @@ jobs:
 
     steps:
       - uses: actions/checkout@v1
-      - name: Get npm cache directory
-        id: npm-cache
-        run: |
-          echo "::set-output name=dir::$(npm config get cache)"
-      - name: Cache node modules
+      - name: Get yarn cache directory
+        id: yarn-cache
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+      - name: Save/restore yarn cache
         uses: actions/cache@v1
         with:
-          path: ${{ steps.npm-cache.outputs.dir }}
-          key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
           restore-keys: |
-            ${{ runner.os }}-node-
+            ${{ runner.os }}-yarn-
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node-version }}
       - name: Install Dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile --ignore-engines
       - name: Run tests
-        run: npm test
+        run: yarn test
         env:
           CI: true

.gitignore

@@ -4,7 +4,6 @@
 /dist
 /lib
 /tmp
-/yarn.lock
 node_modules
 .idea
 test/**/*spec/*

README.md

@@ -326,6 +326,12 @@ The CLI is based on [oclif](https://oclif.io/docs/introduction.html) and can be
 If you think your plugin should be part of the CLI itself, feel free to [open a pull request](https://github.com/SAP/cloud-sdk-cli/compare).
 If you have found a bug in our existing functionality, please [open an issue](https://github.com/SAP/cloud-sdk-cli/issues/new/choose).
 
+### Package Manager
+
+This repository uses [yarn](https://yarnpkg.com/) as a package manager. 
+This is only relevant for the development of the CLI.
+Projects that use the CLI are free to use any package manager as long as a `package.json` is present.
+
 ### Release
 
 The easiest way to create a new release is running
@@ -334,9 +340,9 @@ The easiest way to create a new release is running
 $ npx np
 ```
 
-This will test the code, run any prepublish steps, increase the version as selected by the user and create a draft release in github.
+This will test the code, run any pre-publish steps, increase the version as selected by the user and create a draft release in github.
 Afterwards fill in the release notes and press "Publish release".
-This will trigger the github action and a new release will be published on npm automatically.
+This will trigger the github action and a new release will be published on `npm` automatically.
 
 ## License