Change overwrite and remove to remove interior inserts

src/Chunk.js

@@ -56,6 +56,8 @@ Chunk.prototype = {
 
 	edit ( content, storeName ) {
 		this.content = content;
+		this.intro = '';
+		this.outro = '';
 		this.storeName = storeName;
 
 		this.edited = true;

src/MagicString.js

@@ -308,17 +308,13 @@ MagicString.prototype = {
 			first.edit( content, storeName );
 
 			if ( first !== last ) {
-				first.outro = '';
-
 				let chunk = first.next;
 				while ( chunk !== last ) {
 					chunk.edit( '', false );
-					chunk.intro = chunk.outro = '';
 					chunk = chunk.next;
 				}
 
 				chunk.edit( '', false );
-				chunk.intro = '';
 			}
 		}
 

test/index.js

@@ -698,7 +698,7 @@ describe( 'MagicString', function () {
 			var s = new MagicString( 'abcdefghijkl' );
 
 			s.remove( 0, 6 );
-			s.insertRight( 6, 'DEF' );
+			s.insertLeft( 6, 'DEF' );
 			s.overwrite( 6, 9, 'GHI' );
 			assert.equal( s.toString(), 'DEFGHIjkl' );
 		});
@@ -742,6 +742,17 @@ describe( 'MagicString', function () {
 				TypeError
 			);
 		});
+
+		it ( 'replaces interior inserts', function() {
+			var s = new MagicString( 'abcdefghijkl' );
+
+			s.insertLeft( 1, '&' );
+			s.insertRight( 1, '^' );
+			s.insertLeft( 3, '!' );
+			s.insertRight( 3, '?' );
+			s.overwrite( 1, 3, '...' );
+			assert.equal( s.toString(), 'a&...?defghijkl' );
+		})
 	});
 
 	describe( 'prepend', function () {
@@ -831,6 +842,17 @@ describe( 'MagicString', function () {
 			assert.equal( s.toString(), '(ab);' );
 		});
 
+		it( 'should remove interior inserts', function () {
+			var s = new MagicString( 'abc;' );
+
+			s.insertLeft( 1, '[' );
+			s.insertRight( 1, '(' );
+			s.insertLeft( 2, ')' );
+			s.insertRight( 2, ']' );
+			s.remove( 1, 2 );
+			assert.equal( s.toString(), 'a[]c;' );
+		});
+
 		it( 'should provide a useful error when illegal removals are attempted', function () {
 			var s = new MagicString( 'abcdefghijkl' );