Update to Yarn 4

.yarnrc.yml

@@ -1,3 +1,5 @@
+enableConstraintsChecks: true
+
 packageExtensions:
   "@jbrowse/core@*":
     peerDependencies:
@@ -23,20 +25,10 @@ packageExtensions:
       react-dom: "*"
   mocha@*:
     dependencies:
-      ts-node: "*"
       source-map-support: "*"
+      ts-node: "*"
   mongoose-id-validator@*:
     peerDependencies:
       mongoose: "*"
 
-plugins:
-  - path: .yarn/plugins/@yarnpkg/plugin-typescript.cjs
-    spec: "@yarnpkg/plugin-typescript"
-  - path: .yarn/plugins/@yarnpkg/plugin-workspace-tools.cjs
-    spec: "@yarnpkg/plugin-workspace-tools"
-  - path: .yarn/plugins/@yarnpkg/plugin-version.cjs
-    spec: "@yarnpkg/plugin-version"
-  - path: .yarn/plugins/@yarnpkg/plugin-constraints.cjs
-    spec: "@yarnpkg/plugin-constraints"
-
-yarnPath: .yarn/releases/yarn-3.6.4.cjs
+yarnPath: .yarn/releases/yarn-4.1.1.cjs

package.json

@@ -1,7 +1,7 @@
 {
   "name": "apollo3",
   "description": "Monorepo containing Apollo front and back end code",
-  "packageManager": "yarn@3.6.4",
+  "packageManager": "yarn@4.1.1",
   "workspaces": [
     "packages/*"
   ],
@@ -17,6 +17,7 @@
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^6.1.0",
     "@typescript-eslint/parser": "^6.1.0",
+    "@yarnpkg/types": "^4.0.0",
     "eslint": "^8.45.0",
     "eslint-config-prettier": "^8.8.0",
     "eslint-import-resolver-typescript": "^3.5.5",

yarn.config.cjs

@@ -0,0 +1,32 @@
+// @ts-check
+
+/** @type {import('@yarnpkg/types')} */
+const { defineConfig } = require('@yarnpkg/types')
+
+/**
+ * This rule will enforce that a workspace MUST depend on the same version of
+ * a dependency as the one used by the other workspaces.
+ * Copied from {@link https://yarnpkg.com/features/constraints}.
+ *
+ *
+ * @param {import('@yarnpkg/types').Yarn.Constraints.Context} context
+ */
+function enforceConsistentDependenciesAcrossTheProject({ Yarn }) {
+  for (const dependency of Yarn.dependencies()) {
+    if (dependency.type === 'peerDependencies') continue
+
+    for (const otherDependency of Yarn.dependencies({
+      ident: dependency.ident,
+    })) {
+      if (otherDependency.type === 'peerDependencies') continue
+
+      dependency.update(otherDependency.range)
+    }
+  }
+}
+
+module.exports = defineConfig({
+  constraints: async (ctx) => {
+    enforceConsistentDependenciesAcrossTheProject(ctx)
+  },
+})