import type { NormalizedFontMetrics } from '../../../font-face-types/TrFontFace.js';
import type { WebTrFontFace } from '../../../font-face-types/WebTrFontFace.js';
import { type TextBaseline } from './types.js';
/**
 * Returns CSS font setting string for use in canvas context.
 *
 * @param fontFace
 * @param fontStyle
 * @param fontSize
 * @param precision
 * @param defaultFontFace
 * @returns
 */
export declare function getFontSetting(fontFace: string | string[], fontStyle: string, fontSize: number, precision: number, defaultFontFace: string): string;
/**
 * Returns true if the given character is a zero-width space.
 *
 * @param space
 */
export declare function isZeroWidthSpace(space: string): boolean;
/**
 * Returns true if the given character is a zero-width space or a regular space.
 *
 * @param space
 */
export declare function isSpace(space: string): boolean;
/**
 * Converts a string into an array of tokens and the words between them.
 *
 * @param tokenRegex
 * @param text
 */
export declare function tokenizeString(tokenRegex: RegExp, text: string): string[];
/**
 * Measure the width of a string accounting for letter spacing.
 *
 * @param context
 * @param word
 * @param space
 */
export declare function measureText(word: string, space: number | undefined, context: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D): number;
/**
 * Get the font metrics for a font face.
 *
 * @remarks
 * This function will attempt to grab the explicitly defined metrics from the
 * font face first. If the font face does not have metrics defined, it will
 * attempt to calculate the metrics using the browser's measureText method.
 *
 * If the browser does not support the font metrics API, it will use some
 * default values.
 *
 * @param context
 * @param fontFace
 * @param fontSize
 * @returns
 */
export declare function getWebFontMetrics(context: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D, fontFace: WebTrFontFace, fontSize: number): NormalizedFontMetrics;
export interface WrapTextResult {
    l: string[];
    n: number[];
}
/**
 * Applies newlines to a string to have it optimally fit into the horizontal
 * bounds set by the Text object's wordWrapWidth property.
 *
 * @param text
 * @param wordWrapWidth
 * @param suffix
 * @param context
 */
export declare function wrapWord(word: string, wordWrapWidth: number, suffix: string, context: CanvasRenderingContext2D): string;
/**
 * Applies newlines to a string to have it optimally fit into the horizontal
 * bounds set by the Text object's wordWrapWidth property.
 */
export declare function wrapText(text: string, wordWrapWidth: number, letterSpacing: number, indent: number | undefined, context: CanvasRenderingContext2D | OffscreenCanvasRenderingContext2D): {
    l: string[];
    n: number[];
};
/**
 * Calculate height for the canvas
 *
 * @param textBaseline
 * @param fontSize
 * @param lineHeight
 * @param numLines
 * @param offsetY
 * @returns
 */
export declare function calcHeight(textBaseline: TextBaseline, fontSize: number, lineHeight: number, numLines: number): number;