asset-loader.js
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asset-loader.js
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	const fs = require('fs');
	const path = require('path');
	const { promisify } = require('util');
	const hashFile = require('./hash-file.js');

	const copyFile = promisify(fs.copyFile);
	const exists = promisify(fs.access);
	const readFile = promisify(fs.readFile);
	const makeDir = promisify(fs.mkdir);

	async function pathExists(thePath) {
	try {
	await exists(thePath);
	return true;
	} catch (e) {
	return false;
	}
	}

	module.exports = dir => ({
	asset: async file => {
	const file_path = path.join(dir, file);
	if (!(await pathExists(file_path))) {
	console.error(`Could not load asset: '${file_path}'`.red);
	return '';
	}
	const out_dir = 'public/assets/';
	if (!(await pathExists(out_dir))) {
	await makeDir(out_dir);
	}

	const file_extension = path.extname(file);
	const out_file_path = `${path.basename(
	file,
	file_extension
	)}-${await hashFile(file_path)}${file_extension}`;

	if (!(await pathExists(`${out_dir}${out_file_path}`))) {
	await copyFile(file_path, `${out_dir}${out_file_path}`);
	}
	return `/assets/${out_file_path}`;
	},
	assetContent: async file => {
	const file_path = path.join(dir, file);
	if (!(await pathExists(file_path))) {
	console.error(`Could not load asset: '${file_path}'`.red);
	return '';
	}

	return readFile(file_path);
	},
	});