import { CssDeclMap, KeyframesRegistry } from "../../../types/keyframes.types.js";
/**
 * Normalize a declaration map used inside a keyframe step.
 *
 * Normalization rules:
 * - Drops entries whose property key is empty/whitespace.
 * - Trims keys and values.
 * - Drops entries whose trimmed value becomes the empty string.
 *
 * This keeps the stored form canonical and reduces noisy diffs between
 * semantically equivalent inputs (e.g. accidental trailing whitespace).
 *
 * @param decls
 *   A map of CSS property → raw CSS value text.
 *
 * @returns
 *   A fresh declaration map containing only non-empty keys and values,
 *   with all keys/values trimmed.
 */
export declare function normalize_decls(decls: CssDeclMap): CssDeclMap;
/**
 * Create a small in-memory manager for `@keyframes` blocks.
 *
 * The manager:
 * - Stores canonical keyframe definitions by name (`KeyframesName → KeyframesDef`).
 * - Normalizes all inputs at the boundary (`normalizeKeyframesInput`), ensuring:
 *   - deterministic step ordering
 *   - trimmed keys/values
 *   - validated selectors
 * - Renders either a single block (`renderOne`) or the full set (`renderAll`)
 *   in deterministic name order for snapshot/diff friendliness.
 *
 * Change signaling:
 * - Any mutating operation (`set`, `setMany`, `delete`) calls `args.onChange()`
 *   when it actually changes stored state.
 *
 * Intended usage:
 * - As a sub-manager inside a larger stylesheet system (e.g. a CSS manager)
 *   that re-renders a combined `<style>` element whenever keyframes change.
 *
 * @param args
 *   Construction options.
 *
 * @param args.onChange
 *   Callback invoked after a successful mutation so the owning system can
 *   re-render or flush the stylesheet.
 *
 * @returns
 *   A `KeyframesManager` instance providing set/get/query and render APIs.
 */
export declare function manage_keyframes(args: {
    onChange: () => void;
    /** Internal runtime-local emitted-name prefix. */
    namePrefix?: string;
}): KeyframesRegistry;
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