js-codemod

This repository contains a collection of codemod scripts based on JSCodeshift.

Setup & Run

• npm install -g js-codemod
• js-codemod <codemod-script> <file>
• Use the -d option for a dry-run and use -p to print the output for comparison

Included Scripts

use-strict adds a top-level 'use strict' statement to JavaScript files

• js-codemod use-strict <file>

arrow-function transforms functions to arrow functions

• js-codemod arrow-function <file>

It will transform function() { }.bind(this) calls to () => {}. If the only statement in the body is a ReturnStatement it will remove the curly braces. If you are feeling lucky and you know that returning the value of single-expression functions will not affect the behavior of your application you can specify the --inline-single-expressions=true option and it will transform function() { relay(); }.bind(this) to () => relay() instead of () => { relay(); }.

Recast Options

Options to recast's printer can be provided through the printOptions command line argument

• js-codemod use-strict <file> --printOptions='{"quote":"double"}'