During compile-time, it doesn't care. So you can use "illegal" characters for the names of macros. (macro what? (function () (return '(a b c)))) (what?)

During compile-time, it doesn't care. So you can use "illegal" characters for the names of macros. (macro what? (function () (return '(a b c)))) (what?) That compiles just fine to the JavaScript code a(b, c); It does try to validate identifier names during code generation though (using the esvalid module), so if you give it (? 1 2) then it will error with [Error] Identifier `name` member must be a valid IdentifierName At line 1, offset 1: (? 1 2) (In a terminal, the offending character is highlighted.)