Uderstanding Codemods

Installation

1. Clone the repo and cd into understanding-codemods.
2. update deps - yarn install
3. install jscodeshift globally - npm install -g jscodeshift

Run codemods

1. No comment blocks - Remove all comments from the files

jscodeshift -t transformers/remove-comments.js index.js

2. Adopt arrow functions - Replace all function definitions with arrow functions

jscodeshift -t transformers/to-arrow-functions.js index.js

3. Replace require statements - Replace all “require” imports with es6 “import” statements

jscodeshift -t transformers/to-es6-imports.js index.js

Resources

1. jscodeshift
2. AST examples gist
3. Slides - Should we care about CodeMods?