Throw SilentError when preprocessor could not be instantiated

Author: simonihmig

index.js

@@ -1,5 +1,7 @@
 /* eslint-env node */
 
+const SilentError = require('silent-error');
+
 let TsPreprocessor;
 try {
   TsPreprocessor = require('./lib/typescript-preprocessor');
@@ -28,10 +30,7 @@ module.exports = {
         ui: this.ui
       }));
     } catch (ex) {
-      this.ui.write(
-        'Missing or invalid tsconfig.json, please fix or run `ember generate ember-cli-typescript`.'
-      );
-      this.ui.write('  ' + ex.toString());
+      throw new SilentError(`Missing or invalid tsconfig.json, please fix or run \`ember generate ember-cli-typescript\`.\n${ex}`);
     }
   },
 };

package.json

@@ -37,7 +37,8 @@
     "broccoli-stew": "^1.4.0",
     "broccoli-typescript-compiler": "^2.0.0",
     "debug": "^2.2.0",
-    "ember-cli-babel": "^6.3.0"
+    "ember-cli-babel": "^6.3.0",
+    "silent-error": "^1.1.0"
   },
   "devDependencies": {
     "@types/ember": "^2.7.43",