whole_func_string: function getWebpackConfig(
  	env = {},
  	{
  		entry = {
  			common: path.join( __dirname, 'src', 'common' ),
  			'calypso-iframe-bridge-server': path.join(
  				__dirname,
  				'src',
  				'calypso',
  				'iframe-bridge-server.js'
  			),
  			'calypso-tinymce': path.join( __dirname, 'src', 'calypso', 'tinymce.js' ),
  		},
  		'output-path': outputPath = path.join( __dirname, 'dist' ),
  		'output-filename': outputFilename = isDevelopment ? '[name].js' : '[name].min.js',
  	}
  ) {
  	const webpackConfig = getBaseWebpackConfig( env, {
  		entry,
  		'output-filename': outputFilename,
  		'output-path': outputPath,
  	} );
  
  	return {
  		...webpackConfig,
  		devtool: isDevelopment ? 'inline-cheap-source-map' : false,
  	};
  }
func_code_string: function getWebpackConfig(
  	env = {},
  	{
  		entry = {
  			common: path.join( __dirname, 'src', 'common' ),
  			'calypso-iframe-bridge-server': path.join(
  				__dirname,
  				'src',
  				'calypso',
  				'iframe-bridge-server.js'
  			),
  			'calypso-tinymce': path.join( __dirname, 'src', 'calypso', 'tinymce.js' ),
  		},
  		'output-path': outputPath = path.join( __dirname, 'dist' ),
  		'output-filename': outputFilename = isDevelopment ? '[name].js' : '[name].min.js',
  	}
  ) {
  	const webpackConfig = getBaseWebpackConfig( env, {
  		entry,
  		'output-filename': outputFilename,
  		'output-path': outputPath,
  	} );
  
  	return {
  		...webpackConfig,
  		devtool: isDevelopment ? 'inline-cheap-source-map' : false,
  	};
  }
func_documentation_string: Return a webpack config object
  
  Arguments to this function replicate webpack's so this config can be used on the command line,
  with individual options overridden by command line args.
  
  @see {@link https://webpack.js.org/configuration/configuration-types/#exporting-a-function}
  @see {@link https://webpack.js.org/api/cli/}
  
  @param  {object}  env                           environment options
  @param  {object}  argv                          options map
  @param  {object}  argv.entry                    Entry point(s)
  @param  {string}  argv.'output-path'            Output path
  @param  {string}  argv.'output-filename'        Output filename pattern
  @param  {string}  argv.'output-library-target'  Output library target
  @return {object}                                webpack config