Get Unicode codepoints associated with a particular property escape

getUnicodeCodepoints.js

const fs = require("fs");
const { unicode } = require("./Unicode");

const args = process.argv.slice(2);
const propertyEscape = args[0];
let ret = `const ${propertyEscape.toLowerCase()} = [`;

const regex = new RegExp(`\\p{${propertyEscape}}`, "gu");
for (let i = 0; i < unicode.length; i++) {
    if (unicode[i].match(regex)) {
        if (i <= 65535) {
            if (ret[ret.length - 1] === "[") {
                ret += `"\\\\u${i.toString(16).toUpperCase().padStart(4, "0")}"`;
            } else {
                ret += `, "\\\\u${i
                    .toString(16)
                    .toUpperCase()
                    .padStart(4, "0")}"`;
            }
        } else if (ret[ret.length - 1] === "[") {
            ret += `"\\\\u{${i.toString(16).toUpperCase().padStart(5, "0")}}"`;
        } else {
            ret += `, "\\\\u{${i.toString(16).toUpperCase().padStart(5, "0")}}"`;
        }
    }
}

ret += `];

module.exports = { ${propertyEscape.toLowerCase()} };`;

fs.writeFile(`${propertyEscape}.js`, ret, (err) => {
    if (err) throw err;
});