/**
 * Small, pure module-scope helpers for {@link DkgNodePlugin}.
 *
 * Extracted verbatim from `DkgNodePlugin.ts` to keep the plugin class
 * manageable. No behavior change — same functions/constants, only relocated.
 */
import type { DkgOpenClawConfig } from './types.js';
export declare function isValidEthAddressString(value: string | undefined): boolean;
export declare function channelConfigFingerprint(config: DkgOpenClawConfig['channel']): string | null;
/** Convert a human-readable name into a URL-safe slug (e.g. "My Research Context Graph" → "my-research-context-graph"). */
export declare function slugify(name: string): string;
export declare function pickShareableMultiaddr(addrs: string[]): string | null;
export declare function scoreMultiaddr(addr: string): number;
export declare function isLoopbackIPv4(ip: string): boolean;
export declare function isPrivateIPv4(ip: string): boolean;
/**
 * Extract user-visible text from a message's `content` field. Handles
 * both plain string and multi-modal array forms. Filters to text parts
 * only — image/tool-use parts contribute nothing to the recall query.
 */
export declare function extractUserTextFromContent(content: unknown): string;
/**
 * Format the top-N memory hits as a `<recalled-memory>` block for the
 * W3 auto-recall handler to return via `appendSystemContext`. The tag
 * shape is load-bearing for `ChatTurnWriter.stripRecalledMemory` —
 * keep in sync.
 *
 * Snippet and layer text is user/agent-authored, so both are HTML-entity
 * escaped before interpolation. A snippet containing `</recalled-memory>`
 * would otherwise terminate the wrapper early (escaping arbitrary content
 * into the prompt and bypassing the strip regex).
 */
export declare function formatRecalledMemoryBlock(hits: ReadonlyArray<{
    snippet: string;
    layer: string;
    score: number;
}>): string;
export declare function inferContentTypeFromExtension(filePath: string): string | undefined;
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