import type { CoreSrcSet } from 'twitch-core-ui';
export * from './constants';
export interface SrcAndSrcSet {
    src: string;
    srcSet: CoreSrcSet | undefined;
}
export declare function buildStringFromTemplate(template: string, width: number, height: number): string;
export declare const EMPTY_SRC_AND_SRC_SET: Readonly<SrcAndSrcSet>;
/**
 * Computes an image src and srcSet for a provided image template src containing
 * "{width}" and "{height}" placeholders for consumption by a CoreImage components.
 *
 * Note:
 * Even though we're generally delegating the final element construction to
 * core-ui's CoreImage, the correct order to get proper responsive behavior
 * in all browsers is sizes > srcSet > src, and thus we mirror that here
 */
export declare function getSrcAndSrcSet(imageTemplate: string | null | undefined, imageWidths: number[], aspectRatio: number): SrcAndSrcSet;
export declare function getSrc(imageTemplate: string | null | undefined, imageWidthPx: number, aspectRatio: number): string;
export declare function getBoxArtSrcAndSrcSet(imageTemplate: string | null | undefined, opts?: {
    fallback: false;
}): SrcAndSrcSet;
export declare function getBoxArtSrc(imageTemplate: string | null | undefined, widthPx: number, opts?: {
    fallback: false;
}): string;
/**
 * Generates a src+srcSet object from a channel thumbnail src template
 */
export declare function getChannelThumbnailSrcAndSrcSet(imageTemplate: string | null | undefined, opts?: {
    fallback: false;
}): SrcAndSrcSet;
/**
 * Generates a src string from a channel thumbnail src template for a given
 * width. Generally `getChannelThumbnailSrcAndSrcSet` should be used for general
 * use cases, with this reserved for special exceptions.
 */
export declare function getChannelThumbnailSrc(imageTemplate: string | null | undefined, widthPx: number, opts?: {
    fallback: false;
}): string;
export declare function getOverlaySrcAndSrcSet(imageURL: string | null): SrcAndSrcSet;
export declare function getOverlayImageTemplate(imageURL: string): string;
/**
 * The API to retrieve a channel's banner image URL does not currently support
 * returning a template string, but banner images do support this convention. Therefore,
 * we manually assemble the template string so we can consume it via our srcSet utils.
 */
export declare function getChannelBannerImageTemplate(imageURL: string): string;
export declare function getChannelBannerSrcAndSrcSet(bannerImageURL: string): SrcAndSrcSet;
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