/**
 * Options controlling {@link formatAssetAmount} output.
 */
export interface IFormatAssetAmountOptions {
    /**
     * Number of fractional digits to render. Defaults to the asset's natural
     * precision (6 for joule).
     */
    precision?: number;
    /**
     * BCP-47 locale tag for digit grouping / decimal separator. When omitted,
     * a plain non-localized representation is produced (no thousands grouping,
     * `.` decimal separator).
     */
    locale?: string;
}
/**
 * Format an asset microunit amount as a human-readable string.
 *
 * - For `assetId === 'joule'` the default format is `'1.234567 J'`.
 * - For unknown assetIds the function falls back to `'<microunits> <assetId>'`
 *   raw and never throws.
 *
 * No business logic SHALL parse formatted strings back into amounts; parsing
 * occurs only on validated DTO inputs.
 *
 * @see asset-account-store-generalization spec, Requirements 8.1–8.4.
 */
export declare function formatAssetAmount(amount: bigint, assetId: string, opts?: IFormatAssetAmountOptions): string;
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