/**
 * Render a selector and canonical declaration map into CSS text.
 *
 * Declaration keys are normalized to CSS property names, values are normalized
 * through the shared CSS value path, and empty declarations are skipped.
 *
 * @param selector CSS selector for the rule.
 * @param decls Canonical property map for the rule body.
 * @returns A compact CSS rule, or `""` when no declarations remain.
 */
export declare function render_rule(selector: string, decls: Record<string, string>): string;
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