cmd - "Old Method" in Grunt output -


when running grunt command cmd (i.e. grunt serve, grunt test) output in command window has been showing hundreds of lines saying "old method" ~100 functions similar -

`function from_moz_switchstatement(m){     return new ast_switch({     start: my_start_token(m),     end: my_end_token(m),     expression: from_moz(m.discriminant),     body: m.cases.map(from_moz) }) }`

this isn't stopping grunt tasks completing i'm worried may indicative of deeper issue. has started happening on last couple of days , i'm sure haven't changed grunt file in last few weeks. has come across this?


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