Adds '--cls' option to clear screen between watch runs

Author: colinta

lib/cli.js

@@ -91,6 +91,12 @@ const FLAGS = {
 		description: 'Re-run tests when files change',
 		type: 'boolean',
 	},
+	cls: {
+		alias: 'C',
+		coerce: coerceLastValue,
+		description: 'Clears the screen between test runs',
+		type: 'boolean',
+	},
 };
 
 export default async function loadCli() { // eslint-disable-line complexity
@@ -465,6 +471,7 @@ export default async function loadCli() { // eslint-disable-line complexity
 			reportStream: process.stdout,
 			stdStream: process.stderr,
 			watching: argv.watch,
+			cls: argv.cls,
 		});
 	}
 

lib/reporters/default.js

@@ -73,12 +73,14 @@ export default class Reporter {
 		stdStream,
 		projectDir,
 		watching,
+		cls,
 		durationThreshold,
 	}) {
 		this.extensions = extensions;
 		this.reportStream = reportStream;
 		this.stdStream = stdStream;
 		this.watching = watching;
+		this.cls = cls;
 		this.relativeFile = file => {
 			if (file.startsWith('file://')) {
 				file = fileURLToPath(file);
@@ -128,6 +130,10 @@ export default class Reporter {
 	}
 
 	startRun(plan) {
+		if (this.cls) {
+			this.lineWriter.write('\x1b[2J\x1b[H\x1b[3J');
+		}
+
 		if (plan.bailWithoutReporting) {
 			return;
 		}