/**
 * Paint `text`, the cells of a segment of the CJK composer on a
 * horizontal page, with `paint` (the caller's `fillText`) from `x` on
 * `y`, in the context's font, language and letter-spacing: run by run,
 * each where the cells before it end (see the module comment), turned
 * back as one run on a mirrored page. Returns false, with nothing
 * painted, for a text the caller paints whole: one the browser sets as
 * wide as its cells, a text that is not all cells, a context that does
 * not measure.
 */
export declare function fillCellRuns(ctx: CanvasRenderingContext2D, text: string, x: number, y: number, paint: (text: string, x: number, y: number) => void): boolean;
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