/**
 * @param {string} str
 * @param {boolean} [utf8]
 * @return {Uint8Array}
 */
export function string_to_bytes(str: string, utf8?: boolean): Uint8Array;
export function hex_to_bytes(str: any): Uint8Array;
export function base64_to_bytes(str: any): Uint8Array;
export function bytes_to_string(bytes: any, utf8: any): string;
export function bytes_to_hex(arr: any): string;
export function bytes_to_base64(arr: any): string;
export function pow2_ceil(a: any): any;
export function is_number(a: any): boolean;
export function is_string(a: any): boolean;
export function is_buffer(a: any): boolean;
export function is_bytes(a: any): boolean;
export function is_typed_array(a: any): boolean;
export function _heap_init(constructor: any, heap: any, heapSize: any): any;
export function _heap_write(heap: any, hpos: any, data: any, dpos: any, dlen: any): any;
export var FloatArray: Float32ArrayConstructor | Float64ArrayConstructor;