import type { GetImageResult } from 'astro';
import type { FileObject } from './types.js';
/**
 * Extract a plain string from a list of rich text items.
 *
 * @see https://developers.notion.com/reference/rich-text
 *
 * @example
 * richTextToPlainText(page.properties.Name.title)
 */
export declare function richTextToPlainText(data: ReadonlyArray<{
    plain_text: string;
}>): string;
/**
 * Extract the URL from a file property.
 *
 * @see https://developers.notion.com/reference/file-object
 */
export declare function fileToUrl(file: FileObject): string;
export declare function fileToUrl(file: FileObject | null): string | undefined;
/**
 * Extract and locally cache the image from a file object.
 * @see https://developers.notion.com/reference/file-object
 */
export declare function fileToImageAsset(file: FileObject): Promise<GetImageResult>;
/**
 * Replace date strings with date objects.
 *
 * @see https://developers.notion.com/reference/page-property-values#date
 */
export declare function dateToDateObjects(dateResponse: {
    start: string;
    end: string | null;
    time_zone: string | null;
} | null): {
    start: Date;
    end: Date | null;
    time_zone: string | null;
} | null;
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