I've seen a few places around the internet passively stating
/* some comment */
According to the ECMAScript 262 5th edition standard section 14.1:
. . . the initial SourceElement productions of a Program or FunctionBody and where each ExpressionStatement in the sequence consists entirely of a StringLiteral token followed a semicolon
and the ECMAScript 262 6th edition standard section 14.1.1:
A Directive Prologue is . . . the initial StatementListItem or ModuleItem productions of a FunctionBody, a ScriptBody, or a ModuleBody.
Comments behave like white space and are discarded
Since comments are not statements and are ultimately discarded,
use strict; can come after them as it is the first effective statement in the body.