export type ImageThemeVariant = 'light' | 'dark';
/** Which site theme an image file is for, from its `-light`/`-dark` name. */
export declare function themeVariantOf(src: string | undefined): ImageThemeVariant | null;
/** Prefix a root-relative public asset path with the site's base path. */
export declare function withBasePath(src: string, basePath: string): string;
/** Whether an image file is an SVG (diagrams are authored as SVG). */
export declare function isSvgSource(src: string | undefined): boolean;
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