https://github.com/n-riesco/jp-babel/pull/7

jp-babel-test.ipynb

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 "cells": [
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   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'use strict'"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "function findFile(filename, dir) {\n",
    "    if (~fs.readdirSync(dir).indexOf(filename)) return path.resolve(dir, filename);\n",
    "    if (path.dirname(dir) === dir) return null;\n",
    "    return findFile(filename, path.dirname(dir));\n",
    "}\n",
    "\n",
    "function getBabelConfig(filepath) {\n",
    "    if (!filepath) return null;\n",
    "    try {\n",
    "        return JSON.parse(fs.readFileSync(filepath, \"utf-8\"));\n",
    "    } catch(err) {\n",
    "        return null;\n",
    "    }\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'/Users/grant/Sites/jupyter/jp-babel/.babelrc'"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "var babelrcPath = findFile('.babelrc', process.cwd());\n",
    "babelrcPath"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{ presets: [ 'es2015' ] }"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "var babelrc = getBabelConfig(babelrcPath);\n",
    "babelrc"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Create a test `.babelrc`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "undefined"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "var testConfig = {\n",
    "    presets: [\"es2015\"]\n",
    "};\n",
    "fs.writeFileSync('.babelrc', JSON.stringify(testConfig, null, 2));"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Delete test `.babelrc`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "undefined"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fs.unlinkSync('.babelrc');"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Babel (Node.js)",
   "language": "babel",
   "name": "babel"
  },
  "language_info": {
   "file_extension": ".js",
   "mimetype": "application/javascript",
   "name": "javascript",
   "version": "5.12.0"
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  "widgets": {
   "state": {},
   "version": "2.0.0-dev"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 1
}