build.js

import { minify } from "terser";
import { readFileSync, writeFileSync, mkdirSync } from "fs";

// ---------------[CONFIG: START]----------------------->
const inputFile = "src/index.js";   // source file
const readme = "src/README.md";     // source file
const distDir = "dist";             // output folder
const fileName = "index";           // output file
const timezone = 'Asia/Manila';     // build timezone
// ---------------[CONFIG: END]----------------------->

const timestamp = new Intl.DateTimeFormat("en-CA", { timeZone: timezone, year: "numeric", month: "2-digit", day: "2-digit", hour: "2-digit", minute: "2-digit", second: "2-digit", hour12: !1 }).format(new Date).replace(/,/g, "");

// read package.json
const pkg = JSON.parse(readFileSync("package.json", "utf-8"));
const versionDir = `versions/${pkg.version}`;

// banner comment (will go to both files)
const banner = `/*!
 * ${pkg.name} v${pkg.version}
 * Description: ${pkg.description}
 * Author: ${pkg.author}
 * GitHub: ${pkg.git}
 * License: ${pkg.license}
 * Build Date: ${timestamp} (${timezone})
*/`;

// make sure folders exist
mkdirSync(distDir, { recursive: true });
mkdirSync(versionDir, { recursive: true });

// read source
const code = readFileSync(inputFile, "utf-8");

// write non-minified
writeFileSync(`${distDir}/${fileName}.js`, banner + "\n" + code, "utf-8");
writeFileSync(`${versionDir}/${fileName}.js`, banner + "\n" + code, "utf-8");

// minify and write
const minified = await minify(code, { output: { preamble: banner } });

writeFileSync(`${distDir}/${fileName}.min.js`, minified.code, "utf-8");
writeFileSync(`${versionDir}/${fileName}.min.js`, minified.code, "utf-8");

// copy README
const readmeContent = readFileSync(readme, "utf-8");
writeFileSync(`${distDir}/README.md`, readmeContent, "utf-8");
writeFileSync(`${versionDir}/README.md`, readmeContent, "utf-8");
writeFileSync(`README.md`, readmeContent, "utf-8");

console.log(`✅ Build complete at ${timestamp} (${timezone}):
 - ${distDir}/${fileName}.js
 - ${distDir}/${fileName}.min.js
 - ${distDir}/README.md
 - ${versionDir}/${fileName}.js
 - ${versionDir}/${fileName}.min.js
 - ${versionDir}/README.md`);