import type { AstroConfig, ImageMetadata, ImageQualityPreset, ImageTransform } from 'astro';
export declare const defaultImageConfig: VercelImageConfig;
export declare function isESMImportedImage(src: ImageMetadata | string): src is ImageMetadata;
type ImageFormat = 'image/avif' | 'image/webp';
type RemotePattern = {
    protocol?: 'http' | 'https';
    hostname: string;
    port?: string;
    pathname?: string;
};
export type VercelImageConfig = {
    /**
     * Supported image widths.
     */
    sizes: number[];
    /**
     * Allowed external domains that can use Image Optimization. Leave empty for only allowing the deployment domain to use Image Optimization.
     */
    domains: string[];
    /**
     * Allowed external patterns that can use Image Optimization. Similar to `domains` but provides more control with RegExp.
     */
    remotePatterns?: RemotePattern[];
    /**
     * Cache duration (in seconds) for the optimized images.
     */
    minimumCacheTTL?: number;
    /**
     * Supported output image formats
     */
    formats?: ImageFormat[];
    /**
     * Allow SVG input image URLs. This is disabled by default for security purposes.
     */
    dangerouslyAllowSVG?: boolean;
    /**
     * Change the [Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) of the optimized images.
     */
    contentSecurityPolicy?: string;
};
export declare const qualityTable: Record<ImageQualityPreset, number>;
export declare function throwIfAssetsNotEnabled(config: AstroConfig, imageService: boolean | undefined): void;
export declare function getImageConfig(images: boolean | undefined, imagesConfig: VercelImageConfig | undefined, command: string): {
    image: {
        service: {
            entrypoint: string;
            config: VercelImageConfig;
        };
    };
} | {
    image?: undefined;
};
export declare function sharedValidateOptions(options: ImageTransform, serviceOptions: Record<string, any>, mode: 'development' | 'production'): ImageTransform;
export {};