jscodeshift-transport

jscodeshift-transport

A great jscodeshift transform and API for finding and replacing module names in import/require statements. I wrote this because other transforms I found seemed not as convenient or comprehensive. This handles both relative imports/requires and imports/requires from node_modules. For instance, it's easy to replace a component from a library with your own wrapper in a local file:

jscodeshift -t ~/jscodeshift-transport ./src \
  --find=@material-ui/core/Button \
  --replace=./src/components/Button

The correct relative path will be used in each replacement, relative to the file being processed. It will work just as well if you swap the --find and --replace values, restoring the original module names.

Requirements

• Node 8 or greater

requires it's not magic enough to handle

• scopes where require is redeclared, e.g. requires inside a function (require) { ... } will be ignored, if you're doing that, please stahp
• computed require paths (any argument besides a string literal)

CLI

Run index.js in this repo with jscodeshift and pass two options to it:

• --find=<VALUE>: The module name to find, just like you would use in an import or require statement, relative to the current working directory: Paths to local files must be absolute or begin with ../ or ./; otherwise, it is assumed you meant an import from node_modules.
• --replace=<VALUE>: The module name to replace it with, just like you would use in an import or require statement, relative to the current working directory: Paths to local files must be absolute or begin with ../ or ./; otherwise, it is assumed you meant an import from node_modules.

It's also possible to do regex replacement on module names:

• --regex=1: Treat --find as a RegExp and find module names that match it, and regex replace --find with --replace on the module names
• --flags=<FLAGS>: Regular expression flags to use for --regex

npm i -g jscodeshift
cd ~
git clone https://github.com/jcoreio/jscodeshift-transport
cd ~/jscodeshift-transport
npm i
cd ~/path/to/your/project
jscodeshift -t ~/jscodeshift-transport ./src \
  --find=@material-ui/core/Button \
  --replace=./src/components/Button

API

jscodeshift-transport exports a replaceModuleNames function you can use in your own jscodeshift transforms.

const { replaceModuleNames } = require('jscodeshift-transport')

It accepts the following arguments:

file: string

The path to the file being transformed

root: Collection

The root jscodeshift Collection from the source code of file. You must use the babylon parser (e.g. require('jscodeshift').withParser('babylon')(code))

find: string | RegExp | (moduleName: string) => boolean

The module name to find in import/require statements. Paths starting with ./ or ../ are treated as relative to the current working directory, not file. If a RegExp is given, it will find all module names that match the RegExp. If a function is given, it will find all module names for which find(moduleName) is truthy.

replace: string | (moduleName: string, info: Info) => ?string

The module name to replace find with in import/require statements, or a function that computes the replacement. Paths starting with ./ or ../ are treated as relative to the current working directory, not file. If you pass a function, it is called with the moduleName and an info object with the following properties, and may return a string replacement module name.

• file: string: The file you passed to replaceModuleNames.
• path: NodePath: The babel NodePath for the import or require statement.

If find is a RegExp, the new module name will be computed as moduleName.replace(find, replace).