node.js - Running Node app with Spy.js does not recognize variables defined with let -


i'm trying run simple node app has global variable defined let , initialized in function , used in (something following code)

let some_variable;  a.dosomething(value => {     some_variable = value;     dosomethingelse(); });  function dosomethingelse() {     // error     console.log(some_variable); }

when running node app command line or webstorm, goes when trying run spy.js, doesn't recognize some_variable , says some_variable not defined.

i tried running --harmony flag doesn't seem make difference.

when changing let some_variable var some_variable seems work, require me change code of entire app profiled spy.js doesn't sound idea.

any ideas how make spy.js recognize let variables? missing simple configuration flag?

(node version 6.10.1)


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