feat(core): Add feature flag for granular credential sharing work (#39293)

packages/cli/src/constants/__tests__/credential-sharing.test.ts

@@ -0,0 +1,34 @@
+import { isCredSharingEnabled } from '@/constants/credential-sharing';
+
+describe('isCredSharingEnabled', () => {
+	const originalEnv = process.env;
+
+	beforeEach(() => {
+		process.env = { ...originalEnv };
+	});
+
+	afterAll(() => {
+		process.env = originalEnv;
+	});
+
+	it('should return true when N8N_ENV_FEAT_CRED_SHARING is "true"', () => {
+		process.env.N8N_ENV_FEAT_CRED_SHARING = 'true';
+
+		expect(isCredSharingEnabled()).toBe(true);
+	});
+
+	it('should return false when N8N_ENV_FEAT_CRED_SHARING is unset', () => {
+		delete process.env.N8N_ENV_FEAT_CRED_SHARING;
+
+		expect(isCredSharingEnabled()).toBe(false);
+	});
+
+	it.each(['false', 'TRUE', '1', ''])(
+		'should return false when N8N_ENV_FEAT_CRED_SHARING is %p',
+		(value) => {
+			process.env.N8N_ENV_FEAT_CRED_SHARING = value;
+
+			expect(isCredSharingEnabled()).toBe(false);
+		},
+	);
+});

packages/cli/src/constants/credential-sharing.ts

@@ -0,0 +1,10 @@
+import { isEnvFeatureEnabled } from '@n8n/backend-common';
+
+/**
+ * More granular credential sharing (personal-space credentials usable in any
+ * project their owner works in, the can-see/can-use split, and related
+ * behavior) is opt-in while it lands on master in incremental pieces.
+ */
+export function isCredSharingEnabled(): boolean {
+	return isEnvFeatureEnabled('N8N_ENV_FEAT_CRED_SHARING');
+}