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Kristiyan Kostadinov 4eb0165750 fix(compiler): remove support for unassignable expressions in two-way bindings (#55342)
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
2024-04-16 17:26:09 +02:00
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