Get rid of alternate screen and simplify screen clearing

bin/src/run/resetScreen.ts

@@ -0,0 +1,17 @@
+import { stderr } from '../logging';
+
+const CLEAR_SCREEN = '\u001Bc';
+
+export function getResetScreen(clearScreen: boolean) {
+	if (clearScreen) {
+		return (heading: string) => stderr(CLEAR_SCREEN + heading);
+	}
+
+	let firstRun = true;
+	return (heading: string) => {
+		if (firstRun) {
+			stderr(heading);
+			firstRun = false;
+		}
+	};
+}

bin/src/run/watch.ts

@@ -15,9 +15,9 @@ import {
 import mergeOptions, { GenericConfigObject } from '../../../src/utils/mergeOptions';
 import relativeId from '../../../src/utils/relativeId';
 import { handleError, stderr } from '../logging';
-import alternateScreen from './alternateScreen';
 import batchWarnings from './batchWarnings';
 import loadConfigFile from './loadConfigFile';
+import { getResetScreen } from './resetScreen';
 import { printTimings } from './timings';
 
 interface WatchEvent {
@@ -41,19 +41,13 @@ export default function watch(
 	silent = false
 ) {
 	const isTTY = Boolean(process.stderr.isTTY);
-
 	const warnings = batchWarnings();
-
-	let processConfigsErr: any;
 	const initialConfigs = processConfigs(configs);
-
 	const clearScreen = initialConfigs.every(
 		config => (config.watch as WatcherOptions).clearScreen !== false
 	);
 
-	const screen = alternateScreen(isTTY && clearScreen);
-	screen.open();
-
+	const resetScreen = getResetScreen(isTTY && clearScreen);
 	let watcher: Watcher;
 	let configWatcher: Watcher;
 
@@ -78,26 +72,16 @@ export default function watch(
 					message: merged.optionError
 				});
 
-			if (
-				(merged.inputOptions as RollupWatchOptions).watch &&
-				((merged.inputOptions as RollupWatchOptions).watch as WatcherOptions).clearScreen === false
-			) {
-				processConfigsErr = stderr;
-			}
-
 			return result;
 		});
 	}
 
 	function start(configs: RollupWatchOptions[]) {
-		const screenWriter = processConfigsErr || screen.reset;
-
 		watcher = rollup.watch(configs);
 
 		watcher.on('event', (event: WatchEvent) => {
 			switch (event.code) {
 				case 'FATAL':
-					screen.close();
 					handleError(event.error as RollupError, true);
 					process.exit(1);
 					break;
@@ -109,7 +93,7 @@ export default function watch(
 
 				case 'START':
 					if (!silent) {
-						screenWriter(tc.underline(`rollup v${rollup.VERSION}`));
+						resetScreen(tc.underline(`rollup v${rollup.VERSION}`));
 					}
 					break;
 
@@ -171,7 +155,6 @@ export default function watch(
 		// removing a non-existent listener is a no-op
 		process.stdin.removeListener('end', close);
 
-		screen.close();
 		if (watcher) watcher.close();
 
 		if (configWatcher) configWatcher.close();

package.json

@@ -72,7 +72,6 @@
     "acorn-import-meta": "^1.0.0",
     "acorn-jsx": "^5.0.1",
     "acorn-walk": "^6.1.1",
-    "ansi-escapes": "^4.2.0",
     "buble": "^0.19.7",
     "chokidar": "^2.1.6",
     "console-group": "^0.3.3",
@@ -89,7 +88,7 @@
     "immutable": "^4.0.0-rc.12",
     "is-reference": "^1.1.2",
     "istanbul": "^0.4.5",
-    "lint-staged": "^8.2.0",
+    "lint-staged": "^8.2.1",
     "locate-character": "^2.0.5",
     "magic-string": "^0.25.2",
     "markdownlint-cli": "^0.17.0",
@@ -102,12 +101,12 @@
     "remap-istanbul": "^0.13.0",
     "require-relative": "^0.8.7",
     "requirejs": "^2.3.6",
-    "rollup": "^1.15.1",
+    "rollup": "^1.15.5",
     "rollup-plugin-alias": "^1.5.2",
     "rollup-plugin-buble": "^0.19.6",
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-json": "^4.0.0",
-    "rollup-plugin-node-resolve": "^5.0.1",
+    "rollup-plugin-node-resolve": "^5.0.2",
     "rollup-plugin-replace": "^2.2.0",
     "rollup-plugin-string": "^3.0.0",
     "rollup-plugin-terser": "^5.0.0",
@@ -124,7 +123,7 @@
     "tslib": "^1.10.0",
     "tslint": "^5.17.0",
     "turbocolor": "^2.6.1",
-    "typescript": "^3.5.1",
+    "typescript": "^3.5.2",
     "url-parse": "^1.4.7"
   },
   "files": [

typings/declarations.d.ts

@@ -6,7 +6,6 @@ declare module 'help.md' {
 }
 
 // external libs
-declare module 'ansi-escapes';
 declare module 'pretty-bytes';
 declare module 'rollup-plugin-buble';
 declare module 'signal-exit';