/**
 * Convert a canonical internal style key into a CSS property name.
 *
 * @param propCanon - Canonical property name (camelCase or `--custom-prop`).
 * @returns CSS property name suitable for serialized styles.
 */
export declare function canon_to_css_prop(propCanon: string): string;
/**
 * Normalize a CSS style property key into a canonical form used internally
 * by the style system.
 *
 * This function exists to collapse the many ways a developer might specify
 * a CSS property into a single, predictable representation before it is
 * applied or removed.
 *
 * Accepted input forms:
 * - camelCase (e.g. `backgroundColor`)
 * - kebab-case (e.g. `background-color`)
 * - vendor-prefixed kebab-case (e.g. `-webkit-user-select`)
 * - CSS custom properties (e.g. `--my-var`)
 *
 * Normalization rules:
 * - Custom properties (`--*`) are returned unchanged.
 * - Known CSS aliases (e.g. `"float"`) are mapped explicitly
 *   (e.g. → `"cssFloat"`).
 * - Vendor-prefixed kebab-case properties are converted to their
 *   CSSOM-style camelCase equivalents (e.g. `-webkit-foo-bar` → `WebkitFooBar`).
 * - Standard kebab-case properties are converted to camelCase.
 * - Already-camelCase properties are returned as-is.
 *
 * This canonical form is used consistently across:
 * - Proxy-based setters (`style.set.backgroundColor(...)`)
 * - String-based setters (`setProp("background-color", ...)`)
 * - Bulk setters (`setMany({ backgroundColor: ..., "background-color": ... })`)
 *
 * @param raw
 *   A raw CSS property key in camelCase, kebab-case, vendor-prefixed,
 *   or custom-property form.
 *
 * @returns
 *   A canonicalized property key suitable for internal style application.
 *   Returns an empty string if the input trims to empty.
 */
export declare function normalize_css_key(raw: string): string;
export declare function normalize_css_value(prop: string, value: string): string;
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