build: migrate from npm to Yarn 2 (Berry)

.eslintignore

@@ -1,4 +1,8 @@
+# Generated files
 cjs
 es
 types
-tests
+
+# Yarn
+.yarn
+.pnp.*

.github/workflows/gpr-publish.yml

@@ -16,9 +16,9 @@ jobs:
           registry-url: https://npm.pkg.github.com/
       - name: Build commonjs, es6, esnext and amd
         run: |
-          npm run build:cjs
-          npm run build:es
-          npm run build:types
+          yarn build:cjs
+          yarn build:es
+          yarn build:types
       - name: Publish to gpr
         run: npm publish
         env:

.github/workflows/npm-publish.yml

@@ -12,16 +12,14 @@ jobs:
       - uses: actions/setup-node@v2.1.4
         with:
           check-latest: true
-      - name: Dependency check
-        run: npm ci
       - name: Dependency cruiser check
-        run: npm run test:deps
+        run: yarn test:deps
       - name: Prettier check
-        run: npm run test:prettier
+        run: yarn test:prettier
       - name: ESLint check
-        run: npm run test:eslint
+        run: yarn test:eslint
       - name: Skypack check
-        run: npm run test:skypack
+        run: yarn test:skypack
   test:
     runs-on: ubuntu-latest
     strategy:
@@ -34,7 +32,7 @@ jobs:
         with:
           node-version: ${{matrix.node}}
       - name: Unit tests
-        run: npm cit
+        run: yarn test
   publish-npm:
     runs-on: ubuntu-latest
     needs: [lint, test]
@@ -43,15 +41,13 @@ jobs:
       - uses: actions/setup-node@v2.1.4
         with:
           check-latest: true
-      - name: Install dependencies
-        run: npm ci
       - name: Build commonjs, es6, esnext and amd
         run: |
-          npm run build:cjs
-          npm run build:es
-          npm run build:types
+          yarn build:cjs
+          yarn build:es
+          yarn build:types
       - name: Publish to npm
-        run: npm run release
+        run: yarn release
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/tests.yml

@@ -14,15 +14,15 @@ jobs:
         with:
           check-latest: true
       - name: Dependency check
-        run: npm ci
+        run: yarn --immutable --immutable-cache --check-cache
       - name: Dependency cruiser check
-        run: npm run test:deps
+        run: yarn test:deps
       - name: Prettier check
-        run: npm run test:prettier
+        run: yarn test:prettier
       - name: ESLint check
-        run: npm run test:eslint
+        run: yarn test:eslint
       - name: Skypack check
-        run: npm run test:skypack
+        run: yarn test:skypack
   test:
     needs: check
     runs-on: ubuntu-latest
@@ -36,4 +36,4 @@ jobs:
         with:
           node-version: ${{matrix.node}}
       - name: Unit tests
-        run: npm cit
+        run: yarn test

.gitignore

@@ -27,7 +27,7 @@ coverage
 # nyc test coverage
 .nyc_output
 
-# yarn 2 (Zero-Installs)
+# Yarn 2 (Zero-Installs + Plug'n'Play)
 .yarn/*
 !.yarn/cache
 !.yarn/patches