codemods

This repository contains a collection of codemod scripts for use with JSCodeshift.

Tools

• https://astexplorer.net/- useful for testing and visualizing AST (Abstract Syntax Tree) transformations

Available types for writing codemods and manipulating AST with jscodeshift API are inherited from ast-types package, which implements Esprima API pionneered by Mozilla Parser API

• https://github.com/benjamn/ast-types
• https://esprima.readthedocs.io/en/latest/syntax-tree-format.html
• https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Parser_API

Setup & Run

npm install -g jscodeshift
git clone git@github.com:ricovitch/codemod-react-default-props.git
jscodeshift -t <codemod-script> <file>

Use the -d option for a dry-run and use -p to print the output for comparison.

Included Scripts

default-props

Adds default values for optional proptypes (does nothing if defaultProps assignment exists already)

jscodeshift -t codemods/transforms/default-props.js <path>

TODOs

• Use ReactUtils module from react-codemod package instead of copy-pasting
• Extract reusable util method from default-props.js module
• Support modules with multiple components and multiple propTypes definitions
• Support functional components with HOCs / non arrow function declaration (componentName undefined)
• Support modules with existing but incomplet defaultProps ?
• Add trailing commas at end of lines (with option do deactivate ?) https://eslint.org/docs/rules/comma-dangle