JavaScript: Recognize ":" pseudo-directive.

javascript/ql/src/Expressions/UnknownDirective.ql

@@ -13,6 +13,8 @@ import javascript
 from Directive d
 where
   not d instanceof KnownDirective and
+  // ignore ":" pseudo-directive sometimes seen in dual-use shell/node.js scripts
+  not d.getExpr().getStringValue() = ":" and
   // but exclude attribute top-levels: `<a href="javascript:'some-attribute-string'">`
   not d.getParent() instanceof CodeInAttribute
 select d, "Unknown directive: '" + truncate(d.getDirectiveText(), 20, " ... (truncated)") + "'."