The regExp of IS_PURE_FUNCTION & IS_ARROW_FUNCTION seem to be extra???

[zhtyytg]

source code :

var IS_PURE_FUNCTION = /function.?(/; var IS_ARROW_FUNCTION = /.?=>.*?/;

// pure functions, example: {key: function() {}} if(IS_PURE_FUNCTION.test(serializedFn)) { return serializedFn; }

// arrow functions, example: arg1 => arg1+5 if(IS_ARROW_FUNCTION.test(serializedFn)) { return serializedFn; }

Q: when I use serialize like:
{ name: "aa", attrname: "bb", render(item, row) { return JSON.parse(item) .map((it) => it.name).join(""); }, }

the regExp will catch this and cause problem, not when it's commented. then I test the normal way like this: { name: "aa", attrname: "bb", render: (item, row) => { return JSON.parse(item) .map((it) => it.name).join(""); }, }

and:

{ name: "aa", attrname: "bb", render: function(item, row) { return JSON.parse(item) .map((it) => it.name).join(""); }, }

without the regExps, these are also correct.

could you please explain me?