diff --git a/data/plugins/language_js.lua b/data/plugins/language_js.lua
index 7556b00b..dd1151eb 100644
--- a/data/plugins/language_js.lua
+++ b/data/plugins/language_js.lua
@@ -11,8 +11,8 @@ syntax.add {
     { pattern = { '"', '"', '\\' },     type = "string"   },
     { pattern = { "'", "'", '\\' },     type = "string"   },
     { pattern = { "`", "`", '\\' },     type = "string"   },
-    { pattern = "0x[%da-fA-F]+",        type = "number"   },
-    { pattern = "-?%d+[%d%.eE]*",       type = "number"   },
+    { pattern = "0x[%da-fA-F_]+n?",     type = "number"   },
+    { pattern = "-?%d+[%d%.eE_n]*",     type = "number"   },
     { pattern = "-?%.?%d+",             type = "number"   },
     { pattern = "[%+%-=/%*%^%%<>!~|&]", type = "operator" },
     { pattern = "[%a_][%w_]*%f[(]",     type = "function" },
diff --git a/data/plugins/treeview.lua b/data/plugins/treeview.lua
index fa3ab53a..70dca08f 100644
--- a/data/plugins/treeview.lua
+++ b/data/plugins/treeview.lua
@@ -295,6 +295,12 @@ function TreeView:draw_tooltip()
 end
 
 
+function TreeView:color_for_item(abs_filename)
+  -- other plugins can override this to customize the color of each icon
+  return nil
+end
+
+
 function TreeView:draw()
   self:draw_background(style.background2)
 
@@ -318,6 +324,9 @@ function TreeView:draw()
       color = style.accent
     end
 
+    -- allow for color overrides
+    local icon_color = self:color_for_item(item.abs_filename) or color
+    
     -- icons
     x = x + item.depth * style.padding.x + style.padding.x
     if item.type == "dir" then
@@ -325,11 +334,11 @@ function TreeView:draw()
       local icon2 = item.expanded and "D" or "d"
       common.draw_text(style.icon_font, color, icon1, nil, x, y, 0, h)
       x = x + style.padding.x
-      common.draw_text(style.icon_font, color, icon2, nil, x, y, 0, h)
+      common.draw_text(style.icon_font, icon_color, icon2, nil, x, y, 0, h)
       x = x + icon_width
     else
       x = x + style.padding.x
-      common.draw_text(style.icon_font, color, "f", nil, x, y, 0, h)
+      common.draw_text(style.icon_font, icon_color, "f", nil, x, y, 0, h)
       x = x + icon_width
     end