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Angular error NG0602 means code running in a reactive context called a function that Angular does not allow there. Read the function named in the error, trace the call through the stack, and move its creation or scheduling outside the computed, template, or other reactive callback. The usual fix is to restructure the code—not to wrap it in untracked().
What NG0602 means
Angular monitors signal reads while reactive code runs and connects those reads to the computation that consumed them. When a tracked signal changes, Angular can rerun that computation. A reactive expression should therefore derive a value; creating an effect, scheduling a render hook, or subscribing to an observable from inside it can repeat side effects or create unintended work.
Reactive contexts include computed() and linkedSignal() evaluations, callbacks passed to effect() or afterRenderEffect(), resource parameters or loaders, and component template rendering, including host property bindings. See Angular’s signals guide and NG0602 error guide.
Find the call that caused the error
- Read the full NG0602 message and note the function Angular identifies as disallowed.
- Open the browser’s stack trace and follow it to the application call site. The function may be called inside a helper rather than written directly in the template or computed expression.
- Trace upward from that call to the reactive caller: for example, a computed callback or a template expression.
- Move the operation that creates, schedules, or subscribes outside that reactive execution, then repeat the application path that triggered the error to verify it runs at the intended setup point.
Angular recommends inspecting the named function and stack trace to find where it was invoked and defined. If you maintain a helper that must only run outside reactive execution, Angular also provides assertNotInReactiveContext to check that expectation. See the error guide.
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Fix common causes
effect() called from a computed or template
Create the effect during component, directive, or service setup rather than along a computed or template call path. A constructor is a straightforward option when an injection context is available. If you create the effect elsewhere, Angular’s effects guide documents supplying an Injector in the effect options. The effect API itself asserts that it is called outside a reactive context; it also requires an injection context unless you provide an injector. An injection-context error is distinct from NG0602.
Effects run at least once and track signal reads during each execution. Use them to synchronize signals with imperative systems—such as storage, logging, custom DOM behavior, or a third-party library—not to copy changes from one signal into another. For derived state, use computed(); for derived state that also needs to be writable, consider linkedSignal(). See Angular’s effects guide.
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afterNextRender() or afterEveryRender() scheduled in computed()
Schedule the render hook outside the computed callback, such as during component setup. Otherwise, reevaluations can schedule additional hooks and degrade performance. Angular describes untracked() as an option for opting out of the error, but moving hook creation is the ordinary fix. See the NG0602 guide.
toSignal() created inside computed()
Do not create a new signal wrapper each time the computed runs. Create it once outside the computed, then read that signal inside the calculation:
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const dataSignal = toSignal(dataObservable$);
const value = computed(() => {
return transform(dataSignal());
});If restructuring the code is not possible, Angular suggests considering a manual observable subscription. That changes how the subscription is managed, so choose it deliberately rather than creating a new toSignal() wrapper on every evaluation. See the error guide.
A helper hides the prohibited operation
If the named function is inside a helper, moving only the visible template or computed expression may not be enough. Follow the stack trace into the helper and move the prohibited call—or the helper call itself—to a non-reactive setup point.
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Use untracked() only when you want different tracking
untracked() runs a function without adding its signal reads as dependencies of the surrounding reactive consumer. That can be appropriate when incidental reads, including reads performed by external code, should not trigger reevaluation. But if the surrounding computation needs to update when a value changes, reading that value inside untracked() prevents that dependency from being recorded. It changes behavior; it is not a semantics-free way to silence NG0602. Angular calls it a last resort in the error guide and explains tracking in its signals guide.
One related tracking detail: asynchronous effects
Signal tracking is synchronous. In an async effect, reads made after an await are not tracked. If a signal should trigger the effect when it changes, read it before the asynchronous boundary and keep the value for later use. This is a dependency-tracking detail, not the definition of NG0602. See Angular’s signals guide.
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