old_contents: var isProd = (process.env.BABEL_ENV || process.env.NODE_ENV) === "production";
  /**
   * test env detection is used to default mode for
   * preset-env modules to "commonjs" otherwise, testing framework
   * will struggle
   */
  var isTest = (process.env.BABEL_ENV || process.env.NODE_ENV) === "test";
  
  // default supported browser.
  var defaultBrowserList = ["> 1%", "last 2 versions", "IE >= 9"];
  
  // preact-cli babel configs
  var babelConfigs = require("./lib/lib/babel-config").default;
  
  /**
   * preset as a function means allow users to override some options
   * like env, modules for environment
   */
  module.exports = function preactCli(ctx, userOptions = {}) {
  
  	// set default configs based on user environment
  	var presetOptions = {
  		env: isProd ? "production" : "development",
  		modules: isTest ? "commonjs" : false,
  		browsers: defaultBrowserList
  	};
  
  	// user specified options always the strongest
  	Object.keys(presetOptions).forEach(function (key) {
  		presetOptions[key] = userOptions[key] || presetOptions[key];
  	});
  
  	// yay! return the configs
  	return babelConfigs(
  		{ env: { production: presetOptions.env === "production" } },
  		{ modules: presetOptions.modules, browsers: presetOptions.browsers }
  	);
  };
  
new_contents: var isProd = (process.env.BABEL_ENV || process.env.NODE_ENV) === "production";
  /**
   * test env detection is used to default mode for
   * preset-env modules to "commonjs" otherwise, testing framework
   * will struggle
   */
  var isTest = (process.env.BABEL_ENV || process.env.NODE_ENV) === "test";
  
  // default supported browser.
  var defaultBrowserList = ["> 1%", "last 2 versions", "IE >= 9"];
  
  // preact-cli babel configs
  var babelConfigs = require("./../lib/lib/babel-config").default;
  
  /**
   * preset as a function means allow users to override some options
   * like env, modules for environment
   */
  module.exports = function preactCli(ctx, userOptions = {}) {
  
  	// set default configs based on user environment
  	var presetOptions = {
  		env: isProd ? "production" : "development",
  		modules: isTest ? "commonjs" : false,
  		browsers: defaultBrowserList
  	};
  
  	// user specified options always the strongest
  	Object.keys(presetOptions).forEach(function (key) {
  		presetOptions[key] = userOptions[key] || presetOptions[key];
  	});
  
  	// yay! return the configs
  	return babelConfigs(
  		{ env: { production: presetOptions.env === "production" } },
  		{ modules: presetOptions.modules, browsers: presetOptions.browsers }
  	);
  };
  
subject: correct relative path to babel-config