import { type FontWidthMap } from '../components/text-ellipsis/chars-font-width-map.js';
import type { TextSize } from '../types/text-size.js';
/**
 * A function that measures the pixel width of a string at a given font size.
 * @internal
 */
export type TextMeasurer = (text: string, fontSize: number) => number;
/**
 * Resolves the {@link FontWidthMap} to use when measuring at a given font
 * size. Charts supply their own resolver because the appropriate weight (and
 * therefore the appropriate map) depends on the chart-specific typography.
 * @internal
 */
export type FontWidthMapResolver = (fontSize: number) => FontWidthMap;
/**
 * Options for {@link getTextMeasurer}.
 * @internal
 */
export interface GetTextMeasurerOptions {
    /** Font weight applied when falling back to canvas measurement. */
    fontWeight: number;
    /** Resolves which lookup map to use for preset/auto sizes. */
    resolveMap?: FontWidthMapResolver;
}
/**
 * Returns the appropriate {@link TextMeasurer} for the given text size.
 *
 * When `textSize` is `'auto'` or one of the preset font sizes defined in
 * {@link AUTO_TEXT_SIZE_PRESETS}, a fast lookup-table measurer is returned.
 * Otherwise a measurer backed by `CanvasRenderingContext2D.measureText` is
 * returned for accurate results with arbitrary font sizes.
 * @internal
 */
export declare const getTextMeasurer: (ctx: CanvasRenderingContext2D, textSize: TextSize, options: GetTextMeasurerOptions) => TextMeasurer;