/**
 * cfn-lint extension constraints — cross-property validation rules.
 *
 * Downloads extension schemas from the same cfn-lint tarball and parses
 * them into typed constraint objects for inclusion in lexicon JSON.
 */
/**
 * A single cross-property constraint extracted from a cfn-lint extension schema.
 */
export interface ExtensionConstraint {
    name: string;
    type: "if_then" | "dependent_excluded" | "required_or" | "required_xor";
    condition?: unknown;
    requirement?: unknown;
}
/**
 * Fetch cfn-lint extensions from GitHub tarball and extract to cache.
 */
export declare function fetchCfnLintExtensions(force?: boolean): Promise<string>;
/**
 * Load extension schemas for known resource types.
 * Returns a map of CFN type name → extension constraints.
 */
export declare function loadExtensionSchemas(extensionsDir: string, knownTypes: Set<string>): Map<string, ExtensionConstraint[]>;
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