Example explanation:

Triggers (trigger):
parentTrigger: Defines animations for the parent element.
childTrigger: Defines animations for the child elements.

States (state):
parentTrigger: Has the states start and end.
childTrigger: Has the states visible and hidden.

Styles (style):
Defines final and intermediate styles for different states and transitions.

Transitions (transition):
Defines how the animation should occur between states.

Animate (animate):
Defines the duration and timing function of the animations.

Keyframes (keyframes):|
Used in the transition from visible to hidden in the child elements to create detailed intermediate animations.

Group (group):
Used in the transition from start to end in parentTrigger to animate multiple properties in parallel.

Sequence (sequence):
Used in the transition from end to start in parentTrigger to animate multiple properties in sequence.

Query (query):
Used in the transition from hidden to visible in childTrigger to select and animate child elements.

Stagger (stagger):
Used with query to apply a delay between the animations of the child elements, creating a cascading effect.

One of the most anticipated features since the introduction of standalone components is the ability to detect whether a component or directive imported into a component is actually being used. In Angular v19, this need has finally been addressed with the addition of a diagnostic for unused standalone imports.

The unused import diagnostic is reported as a warning, giving developers a heads-up without blocking the build. This can be especially helpful during development, allowing teams to catch unused imports early in the process. If needed, the diagnostic behavior can be disabled using the unusedStandaloneImports option in the tsconfig.json.