Certain ECMAScript environments permit switiching into a special mode by means of a Directive Prologue. ECMAScript 5 has \"use strict\" and others such as asm have their own
Since no one answered it, but I found the answer and it was confirmed in a comment I'm answering my own to close it.
Yes, to use multiple directives in a prologue list them one after the other like so:
function(){ "use foo"; "use bar"; }
or