import type { PdfSignOptions } from "./phase10-types.js";
export interface PdfSignaturePlaceholderSpec {
    byteRangePlaceholder: string;
    byteRangeWidth: number;
    contentsPlaceholder: string;
    contentsPlaceholderBytes: number;
    fieldName: string;
    kind: "signature" | "timestamp";
}
export interface PdfSignaturePlan {
    signature: PdfSignaturePlaceholderSpec;
    timestamp?: PdfSignaturePlaceholderSpec;
}
export declare function createPdfSignaturePlan(options: PdfSignOptions): PdfSignaturePlan;
export declare function formatPdfSignatureDate(value: Date | string | undefined): string | undefined;
export declare function applyPdfSignaturePlan(buffer: Buffer, plan: PdfSignaturePlan, options: PdfSignOptions): Promise<Buffer>;
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