import { type Easing } from './easings';
/** A passed easing: a function, or a named ease by string ('power2.out', 'elastic.out(1, 0.3)'). */
export type EasingInput = Easing | string;
export type EasingVariant = 'in' | 'out' | 'inOut';
/** Builds the actual easing for a named family, given the variant and any numeric params. */
export type EasingFactory = (variant: EasingVariant, params: ReadonlyArray<number>) => Easing;
/** Register a named ease family ('power2', 'elastic', 'steps', ...) so strings resolve. */
export declare function registerEasing(name: string, factory: EasingFactory): void;
/**
 * Resolve a function-or-name into an Easing. Functions pass through untouched;
 * an unknown name warns once and falls back to easeInOutCubic.
 */
export declare function resolveEasing(input: EasingInput): Easing;
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