Skip to content

fix(core): skip let declarations during hydration cleanup #71990

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
lazerg wants to merge 1 commit into
base: main
Choose a base branch
from
+43 −0
Open

fix(core): skip let declarations during hydration cleanup #71990

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 7 additions & 0 deletions packages/core/src/hydration/cleanup.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ import {
DEHYDRATED_VIEWS,
LContainer,
} from '../render3/interfaces/container';
import {isLetDeclaration, TNode} from '../render3/interfaces/node';
import {Renderer} from '../render3/interfaces/renderer';
import {RNode} from '../render3/interfaces/renderer_dom';
import {isLContainer, isLView} from '../render3/interfaces/type_checks';
Expand Down Expand Up @@ -113,6 +114,12 @@ export function cleanupLView(lView: LView) {

const tView = lView[TVIEW];
for (let i = HEADER_OFFSET; i < tView.bindingStartIndex; i++) {
// Let declarations store their value directly in the LView, which can look like an LView.
const tNode = tView.data[i] as TNode | null;
if (tNode && isLetDeclaration(tNode)) {
continue;
}

if (isLContainer(lView[i])) {
const lContainer = lView[i];
cleanupLContainer(lContainer);
Expand Down
36 changes: 36 additions & 0 deletions packages/platform-server/test/full_app_hydration_spec.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -8323,6 +8323,42 @@ describe('platform-server full application hydration integration', () => {
verifyClientAndSSRContentsMatch(ssrContents, clientRootNode);
expect(clientRootNode.textContent).toContain('Main: Slot: 2');
});

it('should not modify an array stored in a let declaration during cleanup', async () => {
@Component({
selector: 'app',
template: `
@let list = items;
@if (true) {
Length: {{ list.length }}
}
`,
})
class SimpleComponent {
items = Array.from({length: 8}, (_, i) => ({id: i}));
}

const html = await ssr(SimpleComponent);
const ssrContents = getAppContents(html);

expect(ssrContents).toContain('<app ngh');
expect(ssrContents).toContain('Length: 8');

resetTViewsFor(SimpleComponent);

const appRef = await prepareEnvironmentAndHydrate(doc, html, SimpleComponent);
const compRef = getComponentRef<SimpleComponent>(appRef);
appRef.tick();

const clientRootNode = compRef.location.nativeElement;
verifyAllNodesClaimedForHydration(clientRootNode);
verifyClientAndSSRContentsMatch(ssrContents, clientRootNode);
expect(clientRootNode.textContent).toContain('Length: 8');

await appRef.whenStable();

expect(Object.keys(compRef.instance.items[6])).toEqual(['id']);
});
});

describe('@boundary', () => {
Expand Down
Loading