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GeezerVison is showing github.com — feat(compiler-cli): make NG8032 an error by Flarette · Pull Request #71883 · angular/angular

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@Flarette

@Flarette Flarette commented Nov 8, 2026 •
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Depends on #71882. Review only the last commit; the earlier ones are #71882.

PR Checklist

Please check if your PR fulfills the following requirements:

  • The commit message follows our guidelines: https://github.com/angular/angular/blob/main/contributing-docs/commit-message-guidelines.md
  • Tests for the changes have been added (for bug fixes / features)
  • Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

  • Bugfix
  • Feature
  • Code style update (formatting, local variables)
  • Refactoring (no functional changes, no api changes)
  • Build related changes
  • CI related changes
  • Documentation content changes
  • angular.dev application / infrastructure changes
  • Other... Please describe:

What is the current behavior?

After #71882, a component whose selector matches <ng-container> or <ng-template> gets the NG8032
warning. The template still fails when it renders: dev mode throws an assertion, and production
mode throws a DOM HierarchyRequestError.

Issue Number: #71881

What is the new behavior?

NG8032 is an error. It isn't configurable.

Does this PR introduce a breaking change?

  • Yes
  • No

A component whose selector matches <ng-container> or <ng-template> fails to compile. Such a
template already failed when it rendered; only a template that never renders the element, such as
one behind an @if that is always false, compiled and ran before.

Migration: use an element that matches the component's selector.

Other information

  • Independent of feat(compiler-cli): make NG8031 an error #71884 (NG8031 as an error); either can land first.

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@Flarette
feat(compiler-cli): add ignoredBinding check
7cc4b94
<ng-container>, <ng-template>, and <ng-content> don't render an
element, so Angular ignores class, style, attribute, and event bindings
on them, and every binding on <ng-content>. These templates compile and
run without a word, although the bindings never take effect.

Add NG8031 (`ignoredBinding`), a type-check diagnostic that
reports these bindings and static attributes. It needs strictTemplates,
is a warning by default, and is configured through
`extendedDiagnostics.checks` like NG8011. It doesn't report:

- bindings that a directive input or output claims;
- directive host bindings, since a directive is reusable;
- static attributes when a directive or a structural directive matched
  the element, a content projection slot selects it, or Angular reads
  the attribute;
- global event targets such as `document:` and `window:`.

Add NG0319, a dev-mode runtime error that logs class, style, and event
bindings on <ng-container> and <ng-template>, so JIT is covered too.

Add NG8032, a template type-check warning for a component whose
selector matches <ng-container> or <ng-template>. Neither can host a
component: dev mode throws an assertion, and production mode throws a
DOM error when it attaches the component's view to a comment node.
It's a warning for now, because a template that never renders the
element, for example behind an `@if` that is always false, runs today.

The language service no longer suggests DOM attributes on
<ng-container>.

Also report `[attr.x]` on an <ng-container> inside <svg>. The parse
check missed it there, so the binding failed later with a misleading
assertion in dev mode. Templates that hit the new parse error never
worked.

Also fix `<ng-content selector="h1">` in the upgrade examples, which
meant `select`. NG8031 found it, and the repo's build fails on
warnings.
@Flarette Flarette mentioned this pull request Nov 8, 2026
feat(compiler-cli): make NG8031 an error #71884
Closed
6 of 14 tasks
@pullapprove
pullapprove Bot requested a review from crisbeto November 8, 2026 17:02
@angular-robot angular-robot Bot added the detected: breaking change PR contains a commit with a breaking change label Nov 8, 2026
@Flarette Flarette mentioned this pull request Nov 8, 2026
feat(compiler-cli): add ignoredBinding check #71882
Closed
6 of 14 tasks
@angular-robot angular-robot Bot added detected: feature PR contains a feature commit area: compiler Issues related to `ngc`, Angular's template compiler labels Nov 8, 2026
@Flarette Flarette mentioned this pull request Nov 8, 2026
Report bindings that have no effect on ng-container, ng-template, and ng-content #71881
Open
@ngbot ngbot Bot added this to the Backlog milestone Nov 8, 2026
This was referenced Nov 8, 2026
feat(compiler-cli): make NG8031 an error Flarette/angular#2
Closed
feat(compiler-cli): make NG8032 an error Flarette/angular#4
Closed
feat(compiler-cli): add ignoredBinding check Flarette/angular#1
Closed
Flarette added 2 commits November 8, 2026 21:49
@Flarette
fixup! feat(compiler-cli): add ignoredBinding check
0747cac
Don't report a property or event binding whose name appears in the
selector of a directive that matched by that selector. Directive
matching uses these binding names, so the binding makes the directive
match even when no input or output claims it, as in
`<ng-template [foobar]>` with a `[foobar]` selector and no input.
Host directives aren't matched by their selector, so their selectors
don't count.

Also add tests for `[class]` and class interpolation on <ng-container>,
an event binding on <ng-template>, a static class that a projection
slot selects, and <ng-template> inside <svg> and inside a namespaced
element.

Move the three selectorless NG8031 tests from the intentional ngp
differences to the known ngp failures, in their own group. They fail
on ngp with NG2024, because ngp doesn't resolve selectorless
dependencies yet.
@Flarette
feat(compiler-cli): make NG8032 an error
ae252c0
Report a component whose selector matches <ng-container> or
<ng-template> as an error. Neither element can host a component, so
the template fails when it renders: dev mode throws an assertion, and
production mode throws a DOM error.

BREAKING CHANGE: A component on <ng-container> or <ng-template> is
now an error

A component whose selector matches <ng-container> or <ng-template>
now fails to compile with NG8032. Such a template already failed when
it rendered. Use an element that matches the component's selector
instead.
@Flarette
Flarette force-pushed the feat/ng8032-error branch from 6eebd60 to ae252c0 Compare November 8, 2026 19:50
@JeanMeche

JeanMeche commented Nov 8, 2026

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No need to maintain these 2 PRs, until we have setteled on the parent one.

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@JeanMeche JeanMeche closed this Nov 8, 2026
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@crisbeto crisbeto Awaiting requested review from crisbeto

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2 participants

@Flarette @JeanMeche
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