WebAssets Filter to compile ES6 to ES5 using DukPY and BabelJS
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# -*- coding: utf-8 -*- | |
from __future__ import absolute_import, print_function | |
from webassets.filter import Filter | |
__all__ = ('BabelJS',) | |
# NOTE: When using the BabelJS compiler for code | |
# that needs to run in the browser make sure to add | |
# https://cdnjs.cloudflare.com/ajax/libs/babel-core/4.6.6/browser-polyfill.js | |
class BabelJS(Filter): | |
"""WebAssets filter to compile ES6 to ES5 using DukPY. | |
can be registered in WebAssets using:: | |
import webassets.filter | |
webassets.filter.register_filter(BabelJS) | |
it will be available as ``babeljs`` | |
""" | |
name = 'babeljs' | |
max_debug_level = None | |
def setup(self): | |
try: | |
import dukpy | |
except ImportError: | |
raise EnvironmentError('The "dukpy" package is not installed.') | |
else: | |
self.dukpy = dukpy | |
super(BabelJS, self).setup() | |
def input(self, _in, out, **kw): | |
src = self.dukpy.babel_compile(_in.read()) | |
out.write(src) |
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