JSMin filter with a cache

eleventy.config.js

const { minify } = require('terser');
const jsMinCache = {};

module.exports = function (eleventyConfig) {
	eleventyConfig.addNunjucksAsyncFilter('jsmin', async function (code, callback) {
		try {
			if(jsMinCache[code]) {
				callback(null, jsMinCache[code]);
			} else {
				const minified = await minify(code);
				jsMinCache[code] = minified.code;
				callback(null, minified.code);
			}
		} catch (err) {
			console.error('Terser error: ', err);
			delete jsMinCache[code];
			callback(null, code); // Fail gracefully.
		}
	});
};