chrono-node/src/locales/ja/constants.ts

A natural language date parser in Javascript

/**
 * to-hankaku.js
 * convert to ascii code strings.
 *
 * @version 1.0.1
 * @author think49
 * @url https://gist.github.com/964592
 * @license http://www.opensource.org/licenses/mit-license.php (The MIT License)
 */
export function toHankaku(text) {
    return String(text)
        .replace(/\u2019/g, "\u0027")
        .replace(/\u201D/g, "\u0022")
        .replace(/\u3000/g, "\u0020")
        .replace(/\uFFE5/g, "\u00A5")
        .replace(
            /[\uFF01\uFF03-\uFF06\uFF08\uFF09\uFF0C-\uFF19\uFF1C-\uFF1F\uFF21-\uFF3B\uFF3D\uFF3F\uFF41-\uFF5B\uFF5D\uFF5E]/g,
            alphaNum
        );
}

function alphaNum(token) {
    return String.fromCharCode(token.charCodeAt(0) - 65248);
}