Sapper patch to make <base> optional (based on https://github.com/sveltejs/sapper/pull/984) - https://github.com/sveltejs/sapper/issues/228

sapper+0.27.12.patch

diff --git a/node_modules/sapper/runtime/app.mjs b/node_modules/sapper/runtime/app.mjs
index 6dd39c7..602bfdf 100644
--- a/node_modules/sapper/runtime/app.mjs
+++ b/node_modules/sapper/runtime/app.mjs
@@ -356,7 +356,7 @@ async function hydrate_target(target)
 }
 
 function load_css(chunk) {
-	const href = `client/${chunk}`;
+  const href = initial_data.baseUrl + `/client/${chunk}`;
 	if (document.querySelector(`link[href="${href}"]`)) return;
 
 	return new Promise((fulfil, reject) => {
diff --git a/node_modules/sapper/runtime/server.mjs b/node_modules/sapper/runtime/server.mjs
index 405b635..7934b96 100644
--- a/node_modules/sapper/runtime/server.mjs
+++ b/node_modules/sapper/runtime/server.mjs
@@ -2534,7 +2534,7 @@ function get_page_handler(
 				});
 
 				styles = Array.from(css_chunks)
-					.map(href => `<link rel="stylesheet" href="client/${href}">`)
+					.map(href => `<link rel="stylesheet" href="${req.baseUrl}/client/${href}">`)
 					.join('');
 			} else {
 				styles = (css && css.code ? `<style>${css.code}</style>` : '');
@@ -2544,7 +2544,7 @@ function get_page_handler(
 			const nonce_attr = (res.locals && res.locals.nonce) ? ` nonce="${res.locals.nonce}"` : '';
 
 			const body = template()
-				.replace('%sapper.base%', () => `<base href="${req.baseUrl}/">`)
+				.replace('%sapper.base%', () => req.baseTag ? `<base href="${req.baseUrl}/">` : '<!-- no base -->')
 				.replace('%sapper.scripts%', () => `<script${nonce_attr}>${script}</script>`)
 				.replace('%sapper.html%', () => html)
 				.replace('%sapper.head%', () => `<noscript id='sapper-head-start'></noscript>${head}<noscript id='sapper-head-end'></noscript>`)
@@ -2608,12 +2608,15 @@ function middleware(opts
 
 
  = {}) {
-	const { session, ignore } = opts;
+	const { session, ignore, baseTag = true } = opts;
 
 	let emitted_basepath = false;
 
 	return compose_handlers(ignore, [
 		(req, res, next) => {
+      if (req.baseTag === undefined) {
+				req.baseTag = baseTag
+			}
 			if (req.baseUrl === undefined) {
 				let { originalUrl } = req;
 				if (req.url === '/' && originalUrl[originalUrl.length - 1] !== '/') {