import type { SenderAuth } from "../providers/interface.js";
export declare function stripInvisibleChars(text: string): {
    text: string;
    removed: number;
};
export declare function escapeFenceTags(content: string): string;
export declare function newFenceNonce(): string;
export type FenceKind = "body" | "subject";
export declare class ResponseFence {
    readonly nonce: string;
    hiddenTextChars: number;
    invisibleChars: number;
    /** Every message rendered in this response, with whatever the provider could vouch for, so the registry can apply the untrusted-read lock. */
    readonly evidence: Array<{
        from: string;
        auth?: SenderAuth;
    }>;
    constructor(nonce?: string);
    private wrap;
    content(text: string, kind?: FenceKind): string;
    body(text: string, isHtml?: boolean): string;
    header(value: string, field: string): string;
    /** Renders a message's From header and records the provider's authentication evidence alongside it. */
    sender(message: {
        from: string;
        auth?: SenderAuth;
    }): string;
    warnings(): string[];
}
export declare function stripFencing(text: string): string;
export declare function redactTokens(message: string): string;