fix: TS warnings/errors hidden by console clearing (#1635)

Author: rschristian

.changeset/few-carrots-laugh.md

@@ -0,0 +1,5 @@
+---
+'preact-cli': patch
+---
+
+Ensures TS warnings/errors are not hidden by console clearing

packages/cli/lib/lib/webpack/run-webpack.js

@@ -33,6 +33,10 @@ async function devBuild(env) {
 			callback();
 		});
 
+		compiler.hooks.beforeCompile.tap('CliDevPlugin', () => {
+			if (env['clear']) clear(true);
+		});
+
 		compiler.hooks.done.tap('CliDevPlugin', stats => {
 			let devServer = config.devServer;
 			let protocol = process.env.HTTPS || devServer.https ? 'https' : 'http';
@@ -43,8 +47,6 @@ async function devBuild(env) {
 			let serverAddr = `${protocol}://${host}:${bold(env.port)}`;
 			let localIpAddr = `${protocol}://${ip.address()}:${bold(env.port)}`;
 
-			if (env['clear']) clear(true);
-
 			if (stats.hasErrors()) {
 				process.stdout.write(red('Build failed!\n\n'));
 			} else {