No arrow functions despite harmony flag

[ghost]

My main.js file contains this:

app.on('ready', function () {
  app.commandLine.appendSwitch('js-flags', '--harmony');
  // ...
});

Yet arrow functions are unrecognized. Let, const, and classes still work (with "use script").

Using Electron v0.29.1 on Gentoo Linux 2.2

[steelbrain]

How about

var v8 = require('v8')
v8.setFlagsFromString('--harmony-arrow-functions')

https://iojs.org/api/v8.html#v8_setflagsfromstring_string

[steelbrain]

Also --harmony isn't supposed to turn on arrow functions see, https://iojs.org/en/es6.html

[ghost]

Unfortunately, passing neither --harmony-arrow-functions nor --harmony_arrow_functions into v8.setFlagsFromString is enabling arrow functions.

However,

app.on('ready', function () {
  app.commandLine.appendSwitch('js-flags', '--harmony_arrow_functions');
  // ...
});

now solves the problem. I was not aware arrow functions was masked but now I know that an extra flag is required. Thanks!

[0x80]

@keizom I've tried your solution but I still get this error when launching electron:

> DEBUG='app:*' HOT=1 NODE_ENV=development electron .

App threw an error when running [SyntaxError: /Users/me/MyApp/main.js:16
tingle.on('open', () => {
                   ^
Unexpected token )]

Am I missing something? I'm using 0.29.1

[ghost]

@0x80 the code I used enabled arrow functions in a renderer process. Perhaps there is a difference between enabling a renderer process and the main process (?). I do not know electron well enough to know if this is the case.

In the mean time, have you tried @steelbrain's method using v8.setFlagsFromString?

[0x80]

@keizom The code in my renderer process runs through webpack and babel so that's not an issue I guess. I found my problem. You can only put ES6 code in a module that you then require. I was putting arrow functions right in the main.js file where also the v8.setFlagsFromString() calls were made. I don't think that's possible since the syntax will be interpreted/parsed before the flag settings have effect. Anyways it's working now! 👍