Improve error output.

index.js

@@ -12,19 +12,21 @@ const warns = {
 };
 
 const prettySyntaxError = (err) => {
-  if (err._babel && err instanceof SyntaxError) {
-    return new Error(`${err.name}: ${err.message}\n${err.codeFrame}`);
-  } else {
-    return err;
-  }
+  if (!(err._babel && err instanceof SyntaxError)) return err;
+  const msg = err.message.replace(/\(\d+:\d+\)$/, '').replace(/^([\./\w]+\:\s)/, '');
+  const error = new Error(`L${err.loc.line}:${err.loc.column} ${msg}\n${err.codeFrame}`);
+  error.name = '';
+  error.stack = err.stack;
+  return error;
 };
 
 class BabelCompiler {
   constructor(config) {
     if (!config) config = {};
-    const options = config.plugins &&
-      (config.plugins.babel || config.plugins.ES6to5) || {};
-    if (options && !config.plugins.babel && config.plugins.ES6to5) {
+    const pl = config.plugins;
+    const options = pl && (pl.babel || pl.ES6to5) || {};
+
+    if (pl && !pl.babel && pl.ES6to5) {
       logger.warn(warns.ES6to5);
     }
 

package.json

@@ -24,16 +24,19 @@
   "scripts": {
     "test": "eslint index.js && mocha"
   },
-  "files": ["index.js"],
+  "files": [
+    "index.js"
+  ],
   "dependencies": {
-    "babel-core": "^6.0.0",
     "anymatch": "^1.0.0",
-    "loggy": "~1.0.1",
-    "babel-preset-env": "^1.1.8"
+    "babel-core": "^6.0.0",
+    "babel-preset-env": "^1.1.8",
+    "loggy": "~1.0.1"
   },
   "devDependencies": {
     "babel-plugin-transform-es2015-template-literals": "^6.8.0",
     "babel-plugin-transform-node-env-inline": "^6.1.18",
+    "babel-preset-es2015": "^6.22.0",
     "mocha": "^2.0.0",
     "eslint": "^2.0.0"
   }

test.js

@@ -37,7 +37,10 @@ describe('Plugin', function() {
     plugin.compile({data: content, path: 'file.js'}).then(result => {
       assert(result.data.indexOf(expected) !== -1);
       done();
-    }, error => assert(!error));
+    }, error => {
+      console.log(error);
+      assert(!error);
+    });
   });
 
   it('should load indicated presets', function(done) {
@@ -48,7 +51,10 @@ describe('Plugin', function() {
     plugin.compile({data: content, path: 'file.js'}).then(result => {
       assert(result.data.indexOf(expected) !== -1);
       done();
-    }, error => assert(!error));
+    }, error => {
+      console.log(error);
+      assert(!error);
+    });
   });
 
   it('should load indicated presets with options', function(done) {