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/** * convert full-width to half-width in str * @param str string to convert * @param charsets character sets to convert * @returns half-width string */export function toHalfWidth(str: string, charsets: string | RegExp): string {    return str.replace(charsets, (substr) => {        return toHalfWidthAll(substr);    });}/** * convert full-width to half-width * @param str string to convert; ALL ELEMENTS MUST BE FULL-WIDTH! * @returns half-width string */export function toHalfWidthAll(str: string): string {    const charCodes: number[] = [];    for (let index = 0; index < str.length; index++) {        charCodes.push(str.charCodeAt(index) - 65248);    }    return String.fromCharCode(...charCodes);}