/**
 * Order validation utilities.
 */
/**
 * Validate margin input against available balance and exchange minimums.
 *
 * @param margin - Margin amount in USD
 * @param _leverage - Position leverage (reserved for future use)
 * @param availableBalance - Available balance, or null if unknown
 * @param _feeRate - Fee rate as decimal, or null if unknown (reserved for future use)
 * @param minMarginUsd - Minimum margin requirement in USD (exchange-specific).
 *   Source this from the selected provider's `minOrderValueUsd` metadata
 *   (see `@lifi/perps-types` `Provider`) rather than a client-side constant.
 * @returns Error code: 'insufficient' | 'below-minimum' | '' (valid)
 * @public
 */
export declare function validateMargin(margin: number, _leverage: number, availableBalance: number | null, _feeRate: number | null, minMarginUsd: number): string;
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