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<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.
6 of 14 tasks
This was referenced Nov 8, 2026
This was referenced Nov 8, 2026
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.
Report bindings that <ng-container>, <ng-template>, and <ng-content> ignore as errors, since they never take effect. - NG8031 (`ignoredBinding`) is now an error by default. While it's on, NG8030 skips <ng-container>, so each ignored event is reported once. - NG0319 now throws under `errorOnUnknownProperties`, like NG0303. BREAKING CHANGE: Bindings that have no effect are now errors With strictTemplates, a binding that <ng-container>, <ng-template>, or <ng-content> ignores, or a static attribute on them that nothing reads, now fails to compile with NG8031. This includes property bindings on <ng-container> under NO_ERRORS_SCHEMA. Tests that use `errorOnUnknownProperties` now fail on NG0319. Each error points at a binding that never had an effect. Remove the binding, move it to an element, or add the directive that claims it to the component's imports. To report NG8031 as a warning while you migrate, set `extendedDiagnostics.checks.ignoredBinding` to `"warning"`.
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Question for maintainers: unknown properties on |
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No need to maintain these 2 PRs, until we have setteled on the parent one. |
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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:
PR Type
What kind of change does this PR introduce?
What is the current behavior?
After #71882, NG8031 is a warning, and NG0319 only logs, even under
errorOnUnknownProperties. Anunclaimed event on
<ng-container>gets both NG8030 (withstrictUnclaimedEventNames) and NG8031.Issue Number: #71881
What is the new behavior?
This changes severities only; what gets reported stays as in #71882.
<ng-container>, so each ignoredevent gets one error.
errorOnUnknownProperties, like NG0303.Does this PR introduce a breaking change?
With
strictTemplates, a binding or static attribute that NG8031 reports stops compiling,including a property binding on
<ng-container>underNO_ERRORS_SCHEMA. Each error points at abinding that never had an effect.
Tests that use
errorOnUnknownPropertiesfail on NG0319.Migration: remove the binding, move it to an element, or import the directive that claims it. To
report NG8031 as a warning while migrating, set
extendedDiagnostics.checks.ignoredBindingto"warning".Other information
ng_projecttargets in this repo build with this change.