import type { ParsedCss } from "./css.js";
/**
 * DOCXs are a light document canvas (white page, dark text). Computed styles from a
 * browser tab in dark mode often yield near-white `color` with a transparent fill —
 * invisible in Word. These helpers detect that case so we can drop the light
 * foreground and fall back to the document default.
 */
/** Relative luminance of a 6-char RRGGBB hex (sRGB), 0 = black, 1 = white. */
export declare function relativeLuminance(hex: string): number;
/** Whether a parsed 6-char RRGGBB background is dark enough to host light text. */
export declare function isDarkBackgroundColor(hex: string | undefined): boolean;
export interface DocumentCanvasRemapOptions {
    /** True when any ancestor element paints a dark block background (e.g. `.hero`). */
    ancestorHasDarkBackground?: boolean;
}
/**
 * Drop near-white text colors when there is no dark block background — Word's page
 * is white, so those colors would vanish. Light text on a dark shaded block (self or
 * ancestor) is kept.
 */
export declare function remapComputedColorsForDocumentCanvas(css: ParsedCss, options?: DocumentCanvasRemapOptions): ParsedCss;
//# sourceMappingURL=document-canvas.d.ts.map