build.js

const rollup = require("rollup"),
    chalk = require("chalk"),
    babel = require("rollup-plugin-babel"),
    resolve = require("@rollup/plugin-node-resolve"),
    {uglify} = require("rollup-plugin-uglify"),
    pkg = require("./package.json");

const destination = "dist/";

// const warnHandler = (info) => {
//     console.info(chalk.yellow(`encountered rollup warning for: ${info.loc}`), info);
// };

const doRollup = (config) =>
    rollup.rollup(config)
        .then((bundle) => bundle.write(config));

const input = "lib/index.js";

const outputConfig = {
    name: "htmlDirContent",
    format: "umd",
    sourcemap: "inline",
    banner: `/* html-dir-content v${pkg.version} (c) ${new Date().getFullYear()}, Yoav Niran, https://github.com/yoavniran/html-dir-content.git/blob/master/LICENSE */`,
};

const plugins = [
    resolve(),
    babel({ exclude: "node_modules/**" })
];

Promise.all([
    doRollup({ //----------- DEV
        input,
        output: {
            ...outputConfig,
            file: (destination + "html-dir-content.js")
        },
        plugins,
    }),
    doRollup({ //------------ PROD
        input,
        output: {
            ...outputConfig,
            sourcemap: true,
            file: (destination + "html-dir-content.min.js")
        },
        plugins: [
            ...plugins,
            uglify({
                output: {
                    comments: (node, comment) => {
                        return comment.type === "comment2" && /html-dir-content v/i.test(comment.value);
                    }
                }
            }),
        ]
    }),
])
    .then(() => {
        console.info(chalk.green(`✓✓✓ BUILD SUCCESS!`));
    })
    .catch((error) => {
        console.error(chalk.magenta(`!!! BUILD - ERROR!!!!!`), error);
        process.exit(1); //exit with error
    });