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Two-way bindings are meant to represent a property binding to an input and an event binding to an output, e.g. `[(ngModel)]="foo"` represents `[ngModel]="foo" (ngModelChange)="foo = $event"`. Previously due to a quirk in the template parser, we accidentally supported unassignable expressions in two-way bindings. In #54154 the quirk was fixed, but we kept support or some common expression because of internal usages. Now the internal usages have been cleaned up so the backwards-compatibility code can be deleted. Externally a migration was added in #54630 that will automatically fix any places that depended on the old behavior. BREAKING CHANGE: Angular only supports writable expressions inside of two-way bindings. PR Close #55342 |
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