add initial support for expressions in TypeScript

javascript/ql/src/semmlecode.javascript.dbscheme

@@ -349,6 +349,7 @@ case @expr.kind of
 | 112 = @e4x_xml_static_qualident
 | 113 = @e4x_xml_dynamic_qualident
 | 114 = @e4x_xml_dotdotexpr
+| 115 = @importmetaexpr
 ;
 
 @varaccess = @proper_varaccess | @export_varaccess;
@@ -1169,4 +1170,4 @@ extraction_data(
    varchar(900) cacheFile: string ref,
    boolean fromCache: boolean ref,
    int length: int ref
-)
+)