import type { EnvUsage, FrameworkWarning } from '../../config/types.js';
/**
 * Next.js environment variable validation rules
 * @param u - The environment variable usage information
 * @param warnings - The array to push warnings into
 * @param fileContentMap - Optional map of file paths to their content for detecting client components
 */
export declare function applyNextJsRules(u: EnvUsage, warnings: FrameworkWarning[], fileContentMap?: Map<string, string>): void;
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