/**
 * Environment Variable Parser (D-009)
 *
 * Type-safe environment variable parsing with validation.
 * Centralizes all env var access and provides clear error messages
 * for misconfiguration.
 */
import { type LogConfig, type DatabaseConfig, type BrowserProviderConfig, type RedisConfig, type ProxyConfig, type ApiServerConfig, type StripeConfig, type McpServerConfig, type SdkConfig } from './config-schemas.js';
/**
 * Parse and validate logging configuration from environment.
 */
export declare function parseLogConfig(): LogConfig;
/**
 * Parse and validate database configuration from environment.
 */
export declare function parseDatabaseConfig(): DatabaseConfig;
/**
 * Parse and validate browser provider configuration from environment.
 */
export declare function parseBrowserProviderConfig(): BrowserProviderConfig;
/**
 * Parse and validate Redis configuration from environment.
 */
export declare function parseRedisConfig(): RedisConfig;
/**
 * Parse and validate proxy configuration from environment.
 */
export declare function parseProxyConfig(): ProxyConfig;
/**
 * Parse and validate API server configuration from environment.
 */
export declare function parseApiServerConfig(): ApiServerConfig;
/**
 * Parse and validate Stripe configuration from environment.
 */
export declare function parseStripeConfig(): StripeConfig;
/**
 * Parse and validate MCP server configuration from environment.
 */
export declare function parseMcpServerConfig(): McpServerConfig;
/**
 * Parse and validate SDK configuration from environment.
 */
export declare function parseSdkConfig(): SdkConfig;
/**
 * Safe integer parsing with validation.
 * Returns default if value is undefined, NaN, or out of bounds.
 *
 * @deprecated Use Zod schemas with integerStringSchema instead
 */
export declare function safeParseInt(value: string | undefined, defaultVal: number, options?: {
    min?: number;
    max?: number;
}): number;
/**
 * Safe float parsing with validation.
 * Returns default if value is undefined, NaN, or out of bounds.
 *
 * @deprecated Use Zod schemas with rateSchema instead
 */
export declare function safeParseFloat(value: string | undefined, defaultVal: number, options?: {
    min?: number;
    max?: number;
}): number;
/**
 * Parse a boolean from environment variable.
 * Recognizes 'true', '1', 'yes' as true; everything else as false.
 *
 * @deprecated Use Zod schemas with booleanStringSchema instead
 */
export declare function parseBoolean(value: string | undefined): boolean;
/**
 * Parse a comma-separated list from environment variable.
 *
 * @deprecated Use Zod schemas with commaSeparatedListSchema instead
 */
export declare function parseCommaSeparated(value: string | undefined): string[];
/**
 * Get cached log configuration (parses once on first call).
 */
export declare function getLogConfig(): LogConfig;
/**
 * Get cached database configuration (parses once on first call).
 */
export declare function getDatabaseConfig(): DatabaseConfig;
/**
 * Get cached browser provider configuration (parses once on first call).
 */
export declare function getBrowserProviderConfig(): BrowserProviderConfig;
/**
 * Get cached Redis configuration (parses once on first call).
 */
export declare function getRedisConfig(): RedisConfig;
/**
 * Get cached proxy configuration (parses once on first call).
 */
export declare function getProxyConfig(): ProxyConfig;
/**
 * Get cached API server configuration (parses once on first call).
 */
export declare function getApiServerConfig(): ApiServerConfig;
/**
 * Get cached Stripe configuration (parses once on first call).
 */
export declare function getStripeConfig(): StripeConfig;
/**
 * Get cached MCP server configuration (parses once on first call).
 */
export declare function getMcpServerConfig(): McpServerConfig;
/**
 * Get cached SDK configuration (parses once on first call).
 */
export declare function getSdkConfig(): SdkConfig;
/**
 * Clear all cached configurations.
 * Useful for testing when environment variables change.
 */
export declare function clearConfigCache(): void;
/**
 * Validate all configurations at startup.
 * Call this early in application bootstrap to fail fast on misconfig.
 *
 * @param sections - Optional array of section names to validate.
 *                   If not provided, validates all sections.
 * @throws ConfigValidationError if any configuration is invalid.
 */
export declare function validateAllConfigs(sections?: Array<'log' | 'database' | 'browserProvider' | 'redis' | 'proxy' | 'apiServer' | 'stripe' | 'mcpServer' | 'sdk'>): void;
/**
 * Check if a configuration section is valid without throwing.
 *
 * @returns Object with success boolean and optional error message.
 */
export declare function isConfigValid(section: 'log' | 'database' | 'browserProvider' | 'redis' | 'proxy' | 'apiServer' | 'stripe' | 'mcpServer' | 'sdk'): {
    valid: boolean;
    error?: string;
};
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