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In Angular’s legacy animation DSL, define a reusable animation with animation(), export it from a TypeScript module, then call it from a component’s trigger with useAnimation(). You can supply parameters at the call site. For new code, Angular now recommends CSS with animate.enter and animate.leave; the legacy animation package and these helper APIs are deprecated.
Which Angular animation approach should you use?
For a new effect that runs when an element enters or leaves the DOM, use Angular’s compiler-supported animate.enter and animate.leave APIs with CSS classes or a function that uses an animation library. Angular’s current guide recommends this approach rather than starting with @angular/animations. See the Angular animations guide and its enter and leave documentation.
If you are maintaining code that already uses the legacy DSL and need to share parameterized animation steps, animation() and useAnimation() provide that reuse pattern. The reviewed API references mark both deprecated in v20.2 and state an intent to remove them in v23. That is a documented future removal intent, not confirmation that removal has occurred. Check Angular’s current API status before planning a migration.
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The enter/leave recommendation is not evidence that CSS is a one-to-one replacement for every legacy animation capability. Choose based on the effect you need: element entry or exit, reusable parameterized steps or broader sequencing, and whether parent and child animations need coordination.
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How to define and call a reusable legacy animation
- Export a shared definition. In a TypeScript module, import the legacy animation helpers you need and define the animation with
animation(). Angular’s reusable-animation guide demonstrates composing it with helpers such asstyle()andanimate(). - Add parameters where values should vary. Use placeholders such as
{{ time }}or{{ opacity }}in timing strings or style values. Define defaults on the animation where a value should be optional for callers. - Invoke it in component metadata. Inside a component’s trigger and transition, pass the exported definition to
useAnimation(), along with aparamsobject containing any call-specific values. - Supply every required parameter. Invocation values override definition defaults. Angular documents an error if an animation step requires a parameter that has neither a supplied value nor a default.
The official reusable animations guide shows the full metadata pattern with height, opacity, background color, and timing parameters. Its values illustrate how parameterization works; they are not required styling or timing choices.
How to think about parameters and reuse
The reusable definition holds the shared sequence; each useAnimation() call can adjust its parameter values. This is useful when several transitions need the same steps but differ in details such as duration or opacity. Put stable values in the definition, use defaults when sensible, and provide overrides for the cases that need them. Missing required values should be treated as a configuration error rather than assumed to have an implicit value.
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What happens when legacy parent and child animations overlap?
In the legacy animation system, a parent animation takes priority and can prevent animations on child elements from running. A parent transition can query for child animation elements and invoke animateChild() to run them. Angular describes this mechanism in its transition and triggers guide and animateChild API reference.
animateChild() is for coordinating Angular-library animations with query(); it does not run CSS keyframes or CSS transitions. Do not treat it as a general mechanism for coordinating arbitrary CSS effects.
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How to choose between maintaining and replacing the DSL
- Starting a simple enter or leave effect: follow Angular’s CSS-based
animate.enteroranimate.leaveguidance. - Reusing parameterized steps in an existing legacy animation:
animation()plususeAnimation()expresses the pattern, but account for the documented deprecation and intended removal. - Coordinating nested legacy animations: examine whether the parent transition needs
query()andanimateChild(); this is specific to the legacy animation system. - Evaluating a migration: identify the specific behavior in use before choosing a replacement. The documented enter/leave APIs establish a recommended path for those effects, not complete feature parity with the legacy DSL.
For background on the older system, consult Angular’s legacy animations overview. The API status and removal intent are documented in the animation API and useAnimation API.
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