Bump to yarn4

.github/workflows/ci.yml

@@ -21,5 +21,4 @@ jobs:
       - run: yarn ci
         env:
           CI: true
-      # TODO: Migrate to yarn-3 and use `yarn dedupe`, which is the suggested alternative
-      # - run: yarn backstage-cli versions:check
+      - run: yarn dedupe

.gitignore

@@ -36,4 +36,13 @@ site
 *.local.yaml
 
 # Sensitive credentials
-*-credentials.yaml
+*-credentials.yaml
+
+# Yarn files
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.yarnrc.yml

@@ -0,0 +1,6 @@
+compressionLevel: mixed
+enableGlobalCache: true
+httpTimeout: 300000
+nodeLinker: node-modules
+npmRegistryServer: "https://registry.npmjs.org/"
+yarnPath: .yarn/releases/yarn-4.4.1.cjs

package.json

@@ -29,7 +29,7 @@
     "ci": "yarn install && tsc && yarn build:all && backstage-cli test --no-watch && yarn lint",
     "start:frontend": "yarn workspace @spreadshirt/backstage-plugin-s3-viewer start",
     "start:backend": "yarn workspace @spreadshirt/backstage-plugin-s3-viewer-backend start",
-    "start": "concurrently \"yarn start:backend\" \"yarn start:frontend\"",
+    "start": "yarn workspaces foreach -A --include backend --include app --parallel -v -i run start",
     "release": "changeset version && yarn prettier --write 'plugins/*/{package.json,CHANGELOG.md}' '.changeset/*.json' && yarn install --no-immutable",
     "publish-release": "changeset publish",
     "prettier:check": "prettier --check .",
@@ -40,7 +40,6 @@
     "@changesets/cli": "^2.24.4",
     "@spotify/prettier-config": "^12.0.0",
     "@types/react": "^18.0.2",
-    "concurrently": "^8.0.0",
     "jest-junit": "^13.0.0",
     "prettier": "^2.3.2",
     "react": "^18.0.2",
@@ -56,5 +55,6 @@
     "*.{json,md}": [
       "prettier --write"
     ]
-  }
+  },
+  "packageManager": "[email protected]"
 }