[test] Add yarn deduplicate step

.circleci/config.yml

@@ -34,6 +34,9 @@ jobs:
       - run:
           name: Install Dependencies
           command: yarn install --frozen-lockfile
+      - run:
+          name: Check for duplicated packages
+          command: yarn deduplicate
       - save_cache:
           name: Save Cache
           key: yarn-packages-{{ checksum "yarn.lock" }}

package.json

@@ -19,6 +19,7 @@
     "docs:dev": "yarn workspace docs dev",
     "e2e:run": "cypress run",
     "e2e:open": "cypress open",
+    "deduplicate": "node scripts/deduplicate.js",
     "docgen": "node docs/scripts/docgen.js",
     "lint": "eslint . --cache --report-unused-disable-directives --ext .js,.ts,.tsx,.jsx",
     "lint:ci": "eslint . --report-unused-disable-directives --ext .js,.ts,.tsx,.jsx",
@@ -53,7 +54,8 @@
     "husky": "^4.2.5",
     "lint-staged": "^10.2.11",
     "prettier": "^2.0.5",
-    "wait-on": "^5.1.0"
+    "wait-on": "^5.1.0",
+    "yarn-deduplicate": "^2.1.1"
   },
   "husky": {
     "hooks": {

scripts/deduplicate.js

@@ -0,0 +1,40 @@
+const { spawn } = require('child_process');
+const path = require('path');
+const fs = require('fs');
+const deduplicate = require('yarn-deduplicate');
+
+const lockFile = path.resolve(__dirname, '../yarn.lock');
+const yarnlock = fs.readFileSync(lockFile, 'utf8');
+
+const duplicates = deduplicate.listDuplicates(yarnlock);
+if (duplicates.length === 0) {
+  console.log('No duplicated packages found');
+  process.exit(0);
+}
+
+console.log(
+  `${duplicates.length} duplicated package(s) found\n${duplicates.map((x) => `  ${x}`).join('\n')}`
+);
+
+if (process.env.CI) {
+  console.error(
+    [
+      `Error: There are currently ${duplicates.length} duplicated package(s).`,
+      `To deduplicate run "yarn deduplicate"`,
+    ].join('\n')
+  );
+  process.exit(1);
+}
+
+console.log('Deduplicating package(s)');
+fs.writeFileSync(lockFile, deduplicate.fixDuplicates(yarnlock));
+
+const yarn = spawn('yarn', {
+  shell: true,
+  stdio: 'inherit',
+  cwd: path.resolve(__dirname, '..'),
+});
+
+yarn.on('close', (code) => {
+  process.exit(code);
+});