es6 (babel) compressor?

[d9k]

Do the es6 compressor exist?

[alanhamlett]

Not yet, but we could use an es6 transpiler and minifier for the JavaScript compressor instead of using jsmin.

[d9k]

@jaysonsantos, @alanhamlett, hope to see it soon 😉

[alanhamlett]

I don't have the resources to build it right now, but we're open to pull requests.

[jaysonsantos]

@d9k If you know how to transpile manually, write the steps here so someone or I can pick it up to do.

[d9k]

Got to work with local node_modules installation.

1. At your app folder: npm install --save babel-cli babel-preset-es2015 babel-preset-react babel-preset-stage-0
2. manual run to test babel installation:
   node_modules/.bin/babel --presets=es2015,stage-0,react

input:

let a = 5; console.log(a);

after new empty line press Ctrl+D (EOF)

Expected output:

"use strict";

var a = 5;
console.log(a);

3. create babel_compressor.py from this gist: https://gist.github.com/d9k/651a7f926e85cbbfbf32631983529ea2
4. usage (at your web app entry point):

# change your.path.to.babel_compressor to actual path
from your.path.to.babel_compressor import BabelCompressor
from jac.config import Config as JacDefaultConfig

# . . . . .
# right before app initialization:

    # check paths with debugger!
    BabelCompressor.binary = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', 'node_modules', '.bin', 'babel'))
    BabelCompressor.cwd_for_presets_search = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
    jac_default_config = JacDefaultConfig()
    # get jinja2_env. In Pyramid you can get it this way:
    # `jinja2_env = pyramid_jinja2.get_jinja2_environment(config)`
    jinja2_env.compressor_classes = jac_default_config.get('compressor_classes')
    jinja2_env.compressor_classes['text/babel'] = BabelCompressor

5. at your jinja2 template code:

    {% compress 'js' %}
    <script type="text/babel">
        let a = 5;
        console.log(a);
    </script>
    {% endcompress %}

[jaysonsantos]

Hi @d9k, it looks good. Do you want to wrap it in a pull request with the proper tests?
If you have Babel in your path you don't have to change BabelCompressor.binary and I think you can use uri_cwd instead of cwd_for_presets_search.
Thanks for the help!

[d9k]

@jaysonsantos, thanks for advices!
I would be happy to make pull request.Maybe later, I'm out of time for now.