feat(core): update default cache directory to .nx/cache

packages/nx/migrations.json

@@ -89,6 +89,12 @@
       "version": "16.8.0-beta.3",
       "description": "Escape $ in env variables",
       "implementation": "./src/migrations/update-16-8-0/escape-dollar-sign-env-variables"
+    },
+    "17.0.0-move-cache-directory": {
+      "cli": "nx",
+      "version": "17.0.0-beta.1",
+      "description": "Updates the default cache directory to .nx/cache",
+      "implementation": "./src/migrations/update-17-0-0/move-cache-directory"
     }
   }
 }

packages/nx/src/migrations/update-17-0-0/move-cache-directory.spec.ts

@@ -0,0 +1,43 @@
+import { createTreeWithEmptyWorkspace } from '../../generators/testing-utils/create-tree-with-empty-workspace';
+import migrate from './move-cache-directory';
+
+describe('move-cache-directory', () => {
+  it('should add .nx/cache to the gitignore', () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write('.gitignore', 'node_modules');
+    migrate(tree);
+    expect(tree.read('.gitignore', 'utf-8')).toMatchInlineSnapshot(`
+      "node_modules
+      .nx/cache"
+    `);
+  });
+
+  it('should work if .gitignore is not present', () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.delete('.gitignore');
+    migrate(tree);
+    expect(tree.read('.gitignore', 'utf-8')).toMatchInlineSnapshot(
+      `".nx/cache"`
+    );
+  });
+
+  it('should not change gitignore if directly ignored', () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write('.gitignore', 'node_modules\n.nx/cache');
+    migrate(tree);
+    expect(tree.read('.gitignore', 'utf-8')).toMatchInlineSnapshot(`
+      "node_modules
+      .nx/cache"
+    `);
+  });
+
+  it('should not change gitignore if ignored by another pattern', () => {
+    const tree = createTreeWithEmptyWorkspace();
+    tree.write('.gitignore', 'node_modules\n.*/cache');
+    migrate(tree);
+    expect(tree.read('.gitignore', 'utf-8')).toMatchInlineSnapshot(`
+      "node_modules
+      .*/cache"
+    `);
+  });
+});

packages/nx/src/migrations/update-17-0-0/move-cache-directory.ts

@@ -0,0 +1,16 @@
+import { Tree } from '../../generators/tree';
+import ignore from 'ignore';
+
+export default function moveCacheDirectory(tree: Tree) {
+  const gitignore = tree.exists('.gitignore')
+    ? tree.read('.gitignore', 'utf-8')
+    : '';
+  const ig = ignore();
+  ig.add(gitignore);
+  if (!ig.ignores('.nx/cache')) {
+    const updatedLines = gitignore.length
+      ? [gitignore, '.nx/cache']
+      : ['.nx/cache'];
+    tree.write('.gitignore', updatedLines.join('\n'));
+  }
+}

packages/nx/src/utils/cache-directory.ts

@@ -37,9 +37,7 @@ function cacheDirectory(root: string, cacheDirectory: string) {
 }
 
 function defaultCacheDirectory(root: string) {
-  return existsSync(join(root, '.nx'))
-    ? join(root, '.nx', 'cache')
-    : join(root, 'node_modules', '.cache', 'nx');
+  return join(root, '.nx', 'cache');
 }
 
 /**