Using ecma6

10 June 2017 22:28
When I try to compile ecma6 code I get:

Use –language_in=ECMASCRIPT6 or ECMASCRIPT6_STRICT or higher to enable ES6 features.

However I do not know where can I use this, does not accept this cli switch.
11 June 2017 12:33
Ok I found it. It turned out that blend4web uses the Google Closure Compiler, and the
parameter hardcoded in scripts/lib/

— a/scripts/lib/
+++ b/scripts/lib/
@@ -348,7 +348,7 @@ def fill_global_paths(base_dir):

# closure compiler params
_js_cc_params = [_java_exec, "-jar", js_cc_path,
- "–language_in=ECMASCRIPT5"]
+ "–language_in=ECMASCRIPT6"]

# engine sources directory
_src_dir = join(base_dir, "src")

However I guess it is not wise to change this parameter, because all of the b4w modules are written in es5. So It can effect their optimization badly. So I will transpile my code to es5.
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