/**
 * Environment configuration for PWC Wallet SDK
 * Centralizes all environment variables and provides type-safe access
 */
export interface EnvironmentConfig {
    /** RPC URLs for different chains */
    rpcUrls: {
        [chainId: string]: string;
    };
    /** Explorer URLs for different chains */
    explorerUrls: {
        [chainId: string]: string;
    };
    /** Gas configuration overrides */
    gas: {
        maxFeePerGas?: bigint;
        maxPriorityFeePerGas?: bigint;
        gasLimit?: number;
    };
    /** Network configuration */
    network: {
        defaultChainId: string;
        supportedChains: string[];
    };
    /** Feature flags */
    features: {
        enableEIP1559: boolean;
        enableBatchProcessing: boolean;
        enableGasEstimation: boolean;
    };
}
/**
 * Get environment configuration with defaults
 */
export declare function getEnvironmentConfig(): EnvironmentConfig;
/**
 * Validate environment configuration
 */
export declare function validateEnvironmentConfig(config: EnvironmentConfig): string[];
/**
 * Get environment variable with type conversion
 */
export declare function getEnvVar(key: string, defaultValue?: string): string | undefined;
export declare function getEnvVarNumber(key: string, defaultValue?: number): number | undefined;
export declare function getEnvVarBigInt(key: string, defaultValue?: bigint): bigint | undefined;
export declare function getEnvVarBoolean(key: string, defaultValue?: boolean): boolean | undefined;