fix another var rewrite bug (#181)

src/transform.js

@@ -261,10 +261,13 @@ export default function transformCommonjs ( code, id, isEntry, ignoreGlobal, ign
 					if ( declarator._shouldRemove ) {
 						magicString.remove( c, declarator.end );
 					} else {
-						keepDeclaration = true;
-					}
+						if ( !keepDeclaration ) {
+							magicString.remove( c, declarator.start );
+							keepDeclaration = true;
+						}
 
-					c = declarator.end;
+						c = declarator.end;
+					}
 				}
 
 				if ( !keepDeclaration ) {

test/form/multiple-var-declarations-b/input.js

@@ -0,0 +1,4 @@
+var a = require('./a')
+  , b = 42;
+
+console.log( a, b );

test/form/multiple-var-declarations-b/output.js

@@ -0,0 +1,13 @@
+import './a';
+import a from 'commonjs-proxy:./a';
+
+var b = 42;
+
+console.log( a, b );
+
+var input = {
+
+};
+
+export default input;
+export { input as __moduleExports };

test/form/multiple-var-declarations-c/input.js

@@ -0,0 +1,5 @@
+var a = 'a'
+  , b = require( './b' )
+  , c = 'c';
+
+console.log( a, b, c );

test/form/multiple-var-declarations-c/output.js

@@ -0,0 +1,14 @@
+import './b';
+import b from 'commonjs-proxy:./b';
+
+var a = 'a'
+  , c = 'c';
+
+console.log( a, b, c );
+
+var input = {
+
+};
+
+export default input;
+export { input as __moduleExports };