Add Yarn dedupe CI check (#12717)

.github/workflows/nodejs.yml

@@ -83,7 +83,7 @@ jobs:
         run: yarn check-copyright-headers
 
   yarn-validate:
-    name: Validate Yarn constraints
+    name: Validate Yarn dependencies and constraints
     runs-on: ubuntu-latest
     needs: prepare-yarn-cache
     steps:
@@ -93,8 +93,9 @@ jobs:
           node-version: lts/*
           cache: yarn
       - name: 'Check for unmet constraints (fix w/ "yarn constraints --fix")'
-        run: |
-          yarn constraints
+        run: yarn constraints
+      - name: 'Check for duplicate dependencies (fix w/ "yarn dedupe")'
+        run: yarn dedupe --check
 
   test:
     name: Node v${{ matrix.node-version }} on ${{ matrix.os }} (${{ matrix.shard }})

package.json

@@ -163,6 +163,7 @@
     "node": "^12.13.0 || ^14.15.0 || ^16.13.0 || >=17.0.0"
   },
   "resolutions": {
+    "@types/node": "~12.12.0",
     "babel-jest": "workspace:*",
     "jest": "workspace:*",
     "jest-environment-node": "workspace:*",

yarn.lock

@@ -5203,27 +5203,13 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/node@npm:*, @types/node@npm:~12.12.0":
+"@types/node@npm:~12.12.0":
   version: 12.12.70
   resolution: "@types/node@npm:12.12.70"
   checksum: 69c193e0bce8fa914d478f829bd923ee662b220e069a2e00ffbe109f27d0b38fbf2a9fe78c99eb4d4ccb294248ff8de68019a2c7fadb032d301c6feca25f3d22
   languageName: node
   linkType: hard
 
-"@types/node@npm:12.20.24":
-  version: 12.20.24
-  resolution: "@types/node@npm:12.20.24"
-  checksum: e7a13460e2f5b0b5a32c0f3af7daf1a05201552a66d542d3cc3b1ea8b52d4730250f9eb1961d755e31cfe5d03c78340911a6242657a0a9a17d6f7e341fc9f366
-  languageName: node
-  linkType: hard
-
-"@types/node@npm:^17.0.5":
-  version: 17.0.23
-  resolution: "@types/node@npm:17.0.23"
-  checksum: a3517554737cbb042e76c30d0e5482192ac4d9bea0eeb086e2622d9cabf460a0eb52a696b99fcd18e7fcc93c96db6cc7ae507f6608f256ef0b5c1d8c87a5a470
-  languageName: node
-  linkType: hard
-
 "@types/normalize-package-data@npm:^2.4.0":
   version: 2.4.1
   resolution: "@types/normalize-package-data@npm:2.4.1"