All: Use Lerna to manage monorepo

packages/lib/CssUtils.js

@@ -0,0 +1,27 @@
+const fs = require('fs-extra');
+
+const loadCustomCss = async filePath => {
+	let cssString = '';
+	if (await fs.pathExists(filePath)) {
+		try {
+			cssString = await fs.readFile(filePath, 'utf-8');
+		} catch (error) {
+			let msg = error.message ? error.message : '';
+			msg = `Could not load custom css from ${filePath}\n${msg}`;
+			error.message = msg;
+			throw error;
+		}
+	}
+
+	return cssString;
+};
+
+const injectCustomStyles = async cssFilePath => {
+	const css = await loadCustomCss(cssFilePath);
+	const styleTag = document.createElement('style');
+	styleTag.type = 'text/css';
+	styleTag.appendChild(document.createTextNode(css));
+	document.head.appendChild(styleTag);
+};
+
+module.exports = { loadCustomCss, injectCustomStyles };