remove existing extracted dirs

Author: devsnek

src/bin.js

@@ -83,7 +83,7 @@ async function loadStatus(promptIfEmpty) {
       // nothing
     }
     if (status.selectedEngines.length > Object.keys(status.installed).length) {
-      logger.fatal('Some engines were not installed. This is a bug, please report it.');
+      logger.fatal('Some engines were not installed.');
       process.exitCode = 1;
     }
     fs.writeFileSync(STATUS_PATH, JSON.stringify(status, null, 2));

src/common.js

@@ -52,13 +52,15 @@ function guessPlatform() {
   return `${platform}${arch}`;
 }
 
-function unzip(from, to) {
-  return extractZip(from, { dir: to });
+async function unzip(from, to) {
+  await rmdir(to);
+  await extractZip(from, { dir: to });
 }
 
 async function untar(from, to) {
+  await rmdir(to);
   await ensureDirectory(to);
-  return tar.extract({ file: from, cwd: to });
+  await tar.extract({ file: from, cwd: to });
 }
 
 module.exports = {