/// <reference types="node" />
export type BufferFlag = 'BOT' | 'EOT' | 'PRESERVE_DEFAULT_IGNORABLES' | 'REMOVE_DEFAULT_IGNORABLES' | 'DO_NOT_INSERT_DOTTED_CIRCLE' | 'PRODUCE_UNSAFE_TO_CONCAT';
export declare namespace HB {
    type Handle = ReturnType<typeof hbjs>;
    type Face = ReturnType<ReturnType<typeof hbjs>['createFace']>;
    type Blob = ReturnType<ReturnType<typeof hbjs>['createBlob']>;
    type Font = ReturnType<ReturnType<typeof hbjs>['createFont']>;
    type Buffer = ReturnType<ReturnType<typeof hbjs>['createBuffer']>;
}
/**
 * harfbuzz 的函数
 * @message copied from https://github.com/harfbuzz/harfbuzzjs/blob/main/hbjs.js
 * @author refactor and modify by konghayao
 */
export declare function hbjs(instance: WebAssembly.Instance): {
    createSubset: (face: {
        ptr: any;
        upem: any;
        /**
         * Return the binary contents of an OpenType table.
         * @param {string} table Table name
         */
        reference_table(table: string): Uint8Array;
        collectUnicodes(): Uint32Array;
        /**
         * Return letiation axis infos
         */
        getAxisInfos(): Record<string, {
            min: number;
            max: number;
            default: number;
        }>;
        /**
         * Free the object.
         */
        destroy(): void;
        free(): void;
    }, preserveNameIds?: number[], variationAxes?: Record<string, number>) => {
        ptr: any;
        clearTableDrop(): void;
        adjustLayout(): void;
        deleteChar(arr: number[]): void;
        addChars(arr: (number | [number, number])[]): void;
        getResult(): number;
        runSubset(): number;
        destroy(): void;
        toBinary(): {
            destroy(): void;
            offset: any;
            subsetByteLength: any;
            blobPtr: any;
            data: () => Uint8Array;
        };
    };
    createBlob: (blob: Uint8Array) => {
        ptr: any;
        blobPtr: any;
        /**
         * Free the object.
         */
        destroy(): void;
        free(): void;
    };
    createFace: (blob: {
        ptr: any;
        blobPtr: any;
        /**
         * Free the object.
         */
        destroy(): void;
        free(): void;
    }, index: number) => {
        ptr: any;
        upem: any;
        /**
         * Return the binary contents of an OpenType table.
         * @param {string} table Table name
         */
        reference_table(table: string): Uint8Array;
        collectUnicodes(): Uint32Array;
        /**
         * Return letiation axis infos
         */
        getAxisInfos(): Record<string, {
            min: number;
            max: number;
            default: number;
        }>;
        /**
         * Free the object.
         */
        destroy(): void;
        free(): void;
    };
    createFont: (face: {
        ptr: any;
        upem: any;
        /**
         * Return the binary contents of an OpenType table.
         * @param {string} table Table name
         */
        reference_table(table: string): Uint8Array;
        collectUnicodes(): Uint32Array;
        /**
         * Return letiation axis infos
         */
        getAxisInfos(): Record<string, {
            min: number;
            max: number;
            default: number;
        }>;
        /**
         * Free the object.
         */
        destroy(): void;
        free(): void;
    }) => {
        ptr: any;
        glyphName: (glyphId: number) => string;
        glyphToPath: (glyphId: number) => string;
        /**
         * Return a glyph as a JSON path string
         * based on format described on https://svgwg.org/specs/paths/#InterfaceSVGPathSegment
         * @param {number} glyphId ID of the requested glyph in the font.
         **/
        glyphToJson(glyphId: number): {
            type: string;
            values: number[];
        }[];
        /**
         * Set the font's scale factor, affecting the position values returned from
         * shaping.
         * @param {number} xScale Units to scale in the X dimension.
         * @param {number} yScale Units to scale in the Y dimension.
         **/
        setScale(xScale: number, yScale: number): void;
        /**
         * Set the font's letiations.
         * @param {object} letiations Dictionary of letiations to set
         **/
        setletiations(letiations: Record<string, number>): void;
        /**
         * Free the object.
         */
        destroy(): void;
    };
    createBuffer: () => {
        ptr: any;
        /**
         * Add text to the buffer.
         * @param {string} text Text to be added to the buffer.
         **/
        addText(text: string): void;
        /**
         * Set buffer script, language and direction.
         *
         * This needs to be done before shaping.
         **/
        guessSegmentProperties(): any;
        /**
         * Set buffer direction explicitly.
         * @param {string} direction: One of "ltr", "rtl", "ttb" or "btt"
         */
        setDirection(dir: 'ltr' | 'rtl' | 'ttb' | 'btt'): void;
        /**
         * Set buffer flags explicitly.
         * @param {string[]} flags: A list of strings which may be either:
         * "BOT"
         * "EOT"
         * "PRESERVE_DEFAULT_IGNORABLES"
         * "REMOVE_DEFAULT_IGNORABLES"
         * "DO_NOT_INSERT_DOTTED_CIRCLE"
         * "PRODUCE_UNSAFE_TO_CONCAT"
         */
        setFlags(flags: BufferFlag[]): void;
        /**
         * Set buffer language explicitly.
         * @param {string} language: The buffer language
         */
        setLanguage(language: string): void;
        /**
         * Set buffer script explicitly.
         * @param {string} script: The buffer script
         */
        setScript(script: string): void;
        /**
         * Set the Harfbuzz clustering level.
         *
         * Affects the cluster values returned from shaping.
         * @param {number} level: Clustering level. See the Harfbuzz manual chapter
         * on Clusters.
         **/
        setClusterLevel(level: number): void;
        /**
         * Return the buffer contents as a JSON object.
         *
         * After shaping, this function will return an array of glyph information
         * objects. Each object will have the following attributes:
         *
         *   - g: The glyph ID
         *   - cl: The cluster ID
         *   - ax: Advance width (width to advance after this glyph is painted)
         *   - ay: Advance height (height to advance after this glyph is painted)
         *   - dx: X displacement (adjustment in X dimension when painting this glyph)
         *   - dy: Y displacement (adjustment in Y dimension when painting this glyph)
         *   - flags: Glyph flags like `HB_GLYPH_FLAG_UNSAFE_TO_BREAK` (0x1)
         **/
        json(): {
            g: number;
            cl: number;
            ax: number;
            ay: number;
            dx: number;
            dy: number;
            flags: number;
        }[];
        /**
         * Free the object.
         */
        destroy(): void;
    };
    shape: (font: HB.Font, buffer: HB.Buffer, features?: string) => void;
    shapeWithTrace: (font: {
        ptr: any;
        glyphName: (glyphId: number) => string;
        glyphToPath: (glyphId: number) => string;
        /**
         * Return a glyph as a JSON path string
         * based on format described on https://svgwg.org/specs/paths/#InterfaceSVGPathSegment
         * @param {number} glyphId ID of the requested glyph in the font.
         **/
        glyphToJson(glyphId: number): {
            type: string;
            values: number[];
        }[];
        /**
         * Set the font's scale factor, affecting the position values returned from
         * shaping.
         * @param {number} xScale Units to scale in the X dimension.
         * @param {number} yScale Units to scale in the Y dimension.
         **/
        setScale(xScale: number, yScale: number): void;
        /**
         * Set the font's letiations.
         * @param {object} letiations Dictionary of letiations to set
         **/
        setletiations(letiations: Record<string, number>): void;
        /**
         * Free the object.
         */
        destroy(): void;
    }, buffer: {
        ptr: any;
        glyphName: (glyphId: number) => string;
        glyphToPath: (glyphId: number) => string;
        /**
         * Return a glyph as a JSON path string
         * based on format described on https://svgwg.org/specs/paths/#InterfaceSVGPathSegment
         * @param {number} glyphId ID of the requested glyph in the font.
         **/
        glyphToJson(glyphId: number): {
            type: string;
            values: number[];
        }[];
        /**
         * Set the font's scale factor, affecting the position values returned from
         * shaping.
         * @param {number} xScale Units to scale in the X dimension.
         * @param {number} yScale Units to scale in the Y dimension.
         **/
        setScale(xScale: number, yScale: number): void;
        /**
         * Set the font's letiations.
         * @param {object} letiations Dictionary of letiations to set
         **/
        setletiations(letiations: Record<string, number>): void;
        /**
         * Free the object.
         */
        destroy(): void;
    }, features: string, stop_at: number, stop_phase: number) => any;
    exports: any;
    heapu8: Uint8Array;
    heapf32: Float32Array;
    heapi32: Int32Array;
    heapu32: Uint32Array;
    typedArrayFromSet: {
        (setPtr: number, arrayClass: typeof Float32Array): InstanceType<typeof Float32Array>;
        (setPtr: number, arrayClass: typeof Int32Array): InstanceType<typeof Int32Array>;
        (setPtr: number, arrayClass: typeof Uint32Array): InstanceType<typeof Uint32Array>;
        (setPtr: number, arrayClass: typeof Uint8Array): InstanceType<typeof Uint8Array>;
    };
    collectUnicodes: (ptr?: number) => Uint32Array;
};