redux-shell.js

#!/usr/bin/env node
var util = require('../lib/util');
var fs = require('fs');
var path = require('path');
var opt;
var reducer;
var reducerFunction;
var transpiledModulePath;

opt = require('node-getopt').create([
  ['r', 'root-reducer=ARG', 'specify root reducer module']
, ['b', 'use-babel=ARG', 'enable or disable babel transpilation (default: enable)']
, ['h', 'help', 'display this help']
])
.bindHelp()
.parseSystem();

if (!opt.options['root-reducer']) {
  console.error('no root reducer specified');
  process.exit(1)
}
const reducerModulePath = fs.realpathSync(opt.options['root-reducer']);

const useBabel = ('use-babel' in opt.options) && opt.options['use-babel'] == '=enable';
const babel = useBabel ? require('babel-core') : null;

transpiledModulePath = util.compileModule(babel, reducerModulePath);
// neither gives me the effect that i want
//require.paths = [path.dirname(reducerModulePath)];
//process.env.NODE_PATH = path.dirname(reducerModulePath);
reducer = require(transpiledModulePath);

/* ... */

util.js

var fs = require('fs');
var path = require('path');
var mkdirp = require('mkdirp');
var resolve = require('resolve');

function compileModule(babel, modulePath) {
  var visitedFiles = {};

  return _compileModule(modulePath);

  function _compileModule(modulePath) {
    var filePath = resolve.sync(modulePath, { basedir: process.cwd() });
    var realPath = fs.realpathSync(filePath);
    if (realPath in visitedFiles)
      return;
    console.log('compiling', realPath);
    visitedFiles[realPath] = true;

    /* transpile */
    var input = fs.readFileSync(filePath, 'utf-8');
    var piled = babel.transform(input, {
      ast: false
    , code: true
    , sourceType: 'module'
    , presets: ['es2016', 'es2015']
    , plugins: ['transform-object-rest-spread']
    , sourceFileName: filePath
    , sourceRoot: '/home/hdon/src/git/pitchboard-frontend'
    });

    piled.metadata.modules.imports.forEach(imp => {
      if (imp.source[0] == '.')
        _compileModule(path.join(path.dirname(realPath), imp.source))
    })

    /* cache the result */
    var outFilePath = process.env.HOME + '/.redux-shell/transpiled/' + realPath;
    mkdirp.sync(path.dirname(outFilePath));
    fs.writeFileSync(outFilePath, piled.code);

    return outFilePath.substr(0, outFilePath.length - '.js'.length);
  }
}

module.exports.compileModule = compileModule;