reinstated 2-pass sass generation; errors where source maps exist can cause process to exit

Author: benholloway

lib/build/node-sass.js

@@ -232,16 +232,29 @@ module.exports = function (bannerWidth, libraryPaths) {
       done();
     }
 
-    // perform the sass render
-    sass.render({
-      file        : file.path,
-      data        : file.contents.toString(),
-      success     : successHandler,
-      error       : errorHandler,
-      includePaths: libList,
-      outputStyle : 'compressed',
-      stats       : { },
-      sourceMap   : mapName
+    /**
+     * Perform the sass render with the given <code>sourceMap</code>, <code>error</code>, and <code>success</code>
+     * parameters.
+     * @param {string|boolean} map The source map filename or <code>false</code> for none
+     * @param {function ({string})} error Handler for error
+     * @param {function ({string}, {string})} success Handler for success
+     */
+    function render(map, error, success) {
+      sass.render({
+        file        : file.path,
+        data        : file.contents.toString(),
+        success     : success,
+        error       : error,
+        includePaths: libList,
+        outputStyle : 'compressed',
+        stats       : { },
+        sourceMap   : map
+      });
+    }
+
+    // run first without source-map as this can cause process exit where errors exist
+    render(false, errorHandler, function () {
+      render(mapName, errorHandler, successHandler);
     });
 
   }, function (done) {