mirror of
https://github.com/angular/angular.git
synced 2026-09-14 13:54:52 +08:00
arturovt
8d31b82116
`model()` signals are special because they combine a signal input with a writable output through an internal `OutputEmitterRef`. During upgrade, `setupOutputs()` subscribes to that emitter to keep Angular → AngularJS two-way binding working. The issue was that `updateInput()` could overwrite the signal property directly when `isSignal` was `false` (which happens in JIT mode and when `unsafelyOverwriteSignalInputs` is enabled). Once that happened, the original `OutputEmitterRef` was lost, so the two-way binding stopped working. The fix detects `model()` signals at runtime by checking for both `[SIGNAL]` and a writable `.set()` method, which distinguishes them from read-only `input()` signals. When those traits are present, updates are always applied through `applyValueToInputSignal()` instead of replacing the property directly, regardless of the `unsafelyOverwriteSignalInputs` setting. Fixes #60599