feat(core): add migration to disable adding plugins automatically in existing workspaces

packages/nx/migrations.json

@@ -82,6 +82,13 @@
       "version": "17.3.0-beta.6",
       "description": "Updates the nx wrapper.",
       "implementation": "./src/migrations/update-17-3-0/update-nxw"
+    },
+    "18.0.0-disable-adding-plugins-for-existing-workspaces": {
+      "cli": "nx",
+      "version": "18.0.0-beta.2",
+      "description": "Updates .env to disabled adding plugins when generating projects in an existing Nx workspace",
+      "implementation": "./src/migrations/update-18-0-0/disable-crystal-for-existing-workspaces",
+      "x-repair-skip": true
     }
   }
 }

packages/nx/src/command-line/repair/repair.ts

@@ -12,16 +12,21 @@ export async function repair(
   }
   const verbose = process.env.NX_VERBOSE_LOGGING === 'true';
   return handleErrors(verbose, async () => {
-    const nxMigrations = Object.entries(migrationsJson.generators).map(
-      ([name, migration]) => {
-        return {
-          package: 'nx',
-          cli: 'nx',
-          name,
-          description: migration.description,
-          version: migration.version,
-        } as const;
-      }
+    const nxMigrations = Object.entries(migrationsJson.generators).reduce(
+      (agg, [name, migration]) => {
+        const skip = migration['x-repair-skip'];
+        if (!skip) {
+          agg.push({
+            package: 'nx',
+            cli: 'nx',
+            name,
+            description: migration.description,
+            version: migration.version,
+          } as const);
+        }
+        return agg;
+      },
+      []
     );
 
     const migrations = [...nxMigrations, ...extraMigrations];

packages/nx/src/migrations/update-18-0-0/disable-crysal-for-existing-workspaces.spec.ts

@@ -0,0 +1,29 @@
+import { createTree } from '../../generators/testing-utils/create-tree';
+import migrate from './disable-crystal-for-existing-workspaces';
+
+describe('disable crystal for existing workspaces', () => {
+  it("should create a .env if it doesn't exist", () => {
+    const tree = createTree();
+    migrate(tree);
+    expect(tree.read('.env', 'utf-8')).toMatchInlineSnapshot(`
+      "# Nx 18 enables using plugins to infer targets by default
+      # This is disabled for existing workspaces to maintain compatibility
+      # For more info, see: https://nx.dev/concepts/inferred-tasks
+      NX_ADD_PLUGINS=false"
+    `);
+  });
+
+  it('should update an existing .env', () => {
+    const tree = createTree();
+    tree.write('.env', 'FOO=bar');
+    migrate(tree);
+    expect(tree.read('.env', 'utf-8')).toMatchInlineSnapshot(`
+      "FOO=bar
+
+      # Nx 18 enables using plugins to infer targets by default
+      # This is disabled for existing workspaces to maintain compatibility
+      # For more info, see: https://nx.dev/concepts/inferred-tasks
+      NX_ADD_PLUGINS=false"
+    `);
+  });
+});

packages/nx/src/migrations/update-18-0-0/disable-crystal-for-existing-workspaces.ts

@@ -0,0 +1,33 @@
+import { Tree } from '../../generators/tree';
+import { logger } from '../../utils/logger';
+import ignore from 'ignore';
+
+export default function migrate(tree: Tree) {
+  const ig = ignore();
+  try {
+    ig.add(tree.read('.gitignore', 'utf-8'));
+    if (ig.ignores('.env')) {
+      logger.warn(
+        'NX The NX_ADD_PLUGINS=false environment variable was added to your .env file for backwards compatibility. However, your .env is ignored by git. Other contributors should add this key to their .env file or ensure that the environment variable is true when generating code with Nx.'
+      );
+    }
+  } catch {}
+
+  if (!tree.exists('.env')) {
+    tree.write('.env', '');
+  }
+
+  const dotenv = tree.read('.env', 'utf-8');
+  const newDotenvContents = [
+    '# Nx 18 enables using plugins to infer targets by default',
+    '# This is disabled for existing workspaces to maintain compatibility',
+    '# For more info, see: https://nx.dev/concepts/inferred-tasks',
+    'NX_ADD_PLUGINS=false',
+  ];
+
+  if (dotenv.length) {
+    newDotenvContents.unshift(dotenv, '');
+  }
+
+  tree.write('.env', newDotenvContents.join('\n'));
+}