import type { ImageCdn, UrlTransformer } from 'unpic';
export type Layout = 'fixed' | 'constrained' | 'fullWidth' | 'inset' | 'filled';
type Prettify<T> = {
    [K in keyof T]: T[K];
} & {};
export interface ImageSourceOptions {
    src: string;
    width?: number;
    height?: number;
    aspectRatio?: number;
    layout?: Layout;
    breakpoints?: number[];
    transformer?: UrlTransformer;
    cdn?: ImageCdn;
}
/**
 * HTML image attributes, common to image components in multiple frameworks.
 * For React (and potentially other frameworks added in the future), convert to camelCase.
 */
export interface CoreImageAttributes<TStyle = Record<string, string>> {
    src?: string | number | null;
    width?: string | number | null;
    height?: string | number | null;
    alt?: string | number | null;
    loading?: 'eager' | 'lazy' | null;
    decoding?: 'sync' | 'async' | 'auto' | null;
    style?: TStyle;
    srcset?: string | number | null;
    role?: 'presentation' | 'img' | 'none' | 'figure' | (string & {}) | null;
    sizes?: string | number | null;
    fetchpriority?: 'high' | 'low' | 'auto' | null;
}
export type BaseImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = Exclude<TImageAttributes, 'srcset' | 'style'> & ImageSourceOptions & {
    priority?: boolean;
    fetchpriority?: 'high' | 'low';
    background?: string;
    objectFit?: 'contain' | 'cover' | 'fill' | 'none' | 'scale-down' | 'inherit' | 'initial';
};
type BaseImageWithAspectRatioProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageProps<TImageAttributes, TStyle> & {
    aspectRatio: number;
};
type ImageWithAspectRatioAndWidthProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageWithAspectRatioProps<TImageAttributes, TStyle> & {
    width: number;
};
type ImageWithAspectRatioAndHeightProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageWithAspectRatioProps<TImageAttributes, TStyle> & {
    height: number;
};
type ImageWithWidthAndHeightProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageProps<TImageAttributes, TStyle> & {
    width: number;
    height: number;
};
type ImageWithSizeProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = ImageWithAspectRatioAndWidthProps<TImageAttributes, TStyle> | ImageWithAspectRatioAndHeightProps<TImageAttributes, TStyle> | ImageWithWidthAndHeightProps<TImageAttributes, TStyle>;
export type FixedImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = Prettify<ImageWithSizeProps<TImageAttributes, TStyle> & {
    layout: 'fixed';
}>;
export type ConstrainedImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = ImageWithSizeProps<TImageAttributes, TStyle> & {
    layout?: 'constrained';
};
export type FullWidthImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageProps<TImageAttributes, TStyle> & {
    layout: 'fullWidth';
    width?: never;
};
export type InsetImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageProps<TImageAttributes, TStyle> & {
    layout: 'inset';
};
export type FilledImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle> = BaseImageProps<TImageAttributes, TStyle> & {
    layout: 'filled';
};
export type AWCImageProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle = TImageAttributes['style']> = FixedImageProps<TImageAttributes, TStyle> | ConstrainedImageProps<TImageAttributes, TStyle> | FullWidthImageProps<TImageAttributes, TStyle> | InsetImageProps<TImageAttributes, TStyle> | FilledImageProps<TImageAttributes, TStyle>;
/**
 * Gets the `sizes` attribute for an image, based on the layout and width
 */
export declare const getSizes: (width?: number, layout?: Layout) => string | undefined;
/**
 * Gets the styles for an image
 */
export declare const getStyle: <TImageAttributes extends CoreImageAttributes<TStyle>, TStyle = Record<string, string>>({ width, height, aspectRatio, layout, objectFit, background }: Pick<AWCImageProps<TImageAttributes, TStyle>, 'width' | 'height' | 'aspectRatio' | 'layout' | 'objectFit' | 'background'>) => TImageAttributes['style'];
/**
 * Gets the breakpoints for an image, based on the layout and width
 */
export declare const getBreakpoints: ({ width, layout }: {
    width?: number;
    layout: Layout;
}) => number[];
/**
 * Generate an image srcset
 */
export declare const getSrcSet: ({ src, width, layout, height, aspectRatio, breakpoints, cdn, transformer }: Omit<ImageSourceOptions, 'src'> & {
    src: URL | string;
}) => string | undefined;
/**
 * Generates the props for an img element
 */
export declare function transformProps<TImageAttributes extends CoreImageAttributes<TStyle>, TStyle = Record<string, string>>({ src, width, height, priority, layout, aspectRatio, cdn, transformer, objectFit, background, breakpoints, ...props }: AWCImageProps<TImageAttributes, TStyle>): TImageAttributes;
export {};