fix: drop yarn (#510)

.github/workflows/release.yml

@@ -39,17 +39,11 @@ jobs:
           node-version: ${{ env.stable-node-version}}
           cache: npm
 
-      - name: node_modules cache
-        uses: actions/cache@v2
-        with:
-          path: "**/node_modules"
-          key: ${{ runner.os }}-modules-${{ hashFiles('**/yarn.lock') }}
-
       - name: Install dependencies
-        run: yarn install --frozen-lockfile && yarn add --dev ${{ env.e2e-eslint-version }}
+        run: npm ci && npm i -D ${{ env.e2e-eslint-version }}
 
       - name: Run tests
-        run: yarn test && yarn spec:e2e
+        run: npm test && npm run spec:e2e
 
       - name: Release --dry-run # Uses release.config.js
         if: ${{ github.event.inputs.dryRun == 'true'}}

CONTRIBUTING.md

@@ -6,15 +6,15 @@ Here's a list of tips and tricks that will help you get started.
 
 #### Important Concepts
 
-* Static Analysis
-* ASTs
-* Polyfills
-* TypeScript
-* WebIDL
+- Static Analysis
+- ASTs
+- Polyfills
+- TypeScript
+- WebIDL
 
 ### Benchmarking
 
-Benchmarking (`yarn benchmarks`) helps prevent performance regression.
+Benchmarking (`npm run benchmarks`) helps prevent performance regression.
 
 #### Related Projects
 

azure-pipelines.yml

@@ -1,5 +1,4 @@
 variables:
-  YARN_CACHE_FOLDER: $(Pipeline.Workspace)/.yarn
   stableNodeVersion: "14.x"
   currentNodeVersion: "16.x"
   # Used with `eslintVersion` to see if `spec:e2e` and `benchmarks` should run
@@ -88,27 +87,19 @@ steps:
     inputs:
       versionSpec: $(nodeVersion)
     displayName: Install node@$(nodeVersion)
-  - task: Cache@2
-    inputs:
-      key: 'yarn | "$(Agent.OS)" | yarn.lock'
-      restoreKeys: |
-        yarn | "$(Agent.OS)"
-        yarn
-      path: $(YARN_CACHE_FOLDER)
-    displayName: Cache Yarn packages
-  - script: yarn --frozen-lockfile && yarn add --dev $(eslintVersion) && yarn test
-    displayName: Install dependencies and run yarn test
+  - script: npm ci && npm i -D $(eslintVersion) && npm test
+    displayName: Install dependencies and run npm test
   # E2E tests use eslint@7+ only feature (the Node.js API class ESLint)
   # Also disabled on windows because of jest snapshot problems
-  - script: yarn spec:e2e
+  - script: npm run spec:e2e
     condition: and(contains(variables['eslintVersion'], variables['e2eEslintVersion']), ne(variables['imageName'], 'vs2017-win2016'))
-    displayName: Run yarn spec:e2e if $(eslintVersion) >= $(e2eEslintVersion)
+    displayName: Run npm run spec:e2e if $(eslintVersion) >= $(e2eEslintVersion)
   # Benchmarks use eslint@7_ only feature (the Node.js API class ESLint)
-  - script: yarn benchmarks
+  - script: npm run benchmarks
     condition: contains(variables['eslintVersion'], variables['e2eEslintVersion'])
-    displayName: Run yarn benchmarks if $(eslintVersion) >= $(e2eEslintVersion)
+    displayName: Run npm run benchmarks if $(eslintVersion) >= $(e2eEslintVersion)
   # Upload Jest code coverage
-  - script: yarn spec --coverage --coverageReporters=cobertura
+  - script: npm run spec --coverage --coverageReporters=cobertura
     displayName: Generate Jest coverage report
   - task: PublishCodeCoverageResults@1
     inputs: