Also allow a string in monkeypatched `end` calls

operations/development-server.js

@@ -17,7 +17,7 @@ function monkeyPatchEnd(res) {
 		let originalChunk = args[0];
 		let prefix;
 
-		if (originalChunk == null || Buffer.isBuffer(originalChunk)) {
+		if (originalChunk == null || typeof originalChunk === "string" || Buffer.isBuffer(originalChunk)) {
 			if (res.getHeader("content-type").startsWith("text/html")) {
 				let contentLength = res.getHeader("content-length");
 				
@@ -31,18 +31,22 @@ function monkeyPatchEnd(res) {
 			
 			// Reset the `end` method back to the original method; we don't need to get in the way anymore
 			res.end = end;
+
+			let originalChunkAsBuffer = (typeof originalChunk === "string")
+				? Buffer.from(originalChunk)
+				: originalChunk;
 	
 			if (prefix != null) {
-				let chunk = (originalChunk == null)
+				let chunk = (originalChunkAsBuffer == null)
 					? reloadClientTag
-					: Buffer.concat([ originalChunk, reloadClientTag ]);
+					: Buffer.concat([ originalChunkAsBuffer, reloadClientTag ]);
 
 				end(chunk, ... args.slice(1));
 			} else {
 				end(... args);
 			}
 		} else {
-			throw new Error(`Expected a buffer in 'end', but got something else: ${util.inspect(args[0])}`);
+			throw new Error(`Expected a buffer or string in 'end', but got something else: ${util.inspect(args[0])}`);
 		}
 	};
 }