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Upgrade Constraint Knockout 3.4+ changed computed observable error handling: uncaught errors in evaluators now break dependency tracking permanently, whereas 3.3 swallowed errors and kept tracking alive. Applications upgrading from 3.3 must ensure computeds that previously threw no longer corrupt the dependency graph. Two Documented Approaches pureComputed w
I have a view model where several computed observables derive values from plain observables, and everything is bound with ko.applyBindings at page load. In some flows the model's shape effectively changes at runtime: an observable that a computed depends on may be replaced with a new observable instance, or a property may be added to the view model after bin
Goal: Verify that a Knockout computed observable reflects the latest value of its dependencies when those dependencies are updated asynchronously without triggering the observable's change notification. Constraint: Knockout's computed observables cache their result until a tracked dependency emits a change; the deferredUpdates extender and ko.pureComputed ca
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