You can build a codemod package using three different ways:

  • Build with Codemod Studio
  • Build with codemod learn
  • Scaffold a codemod package

By building a codemod with Codemod Studio or with codemod learn, your codemod package will automatically have the recommended package structure.

If you build a codemod from scratch or a previously built codemod, you will have to scaffold a valid codemod package using Codemod CLI.

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Building with Codemod Studio

To learn how to build codemods with Codemod Studio, please refer to the detailed Codemod Studio usage guide.

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Building with codemod learn

You can use codemod learn to build a codemod from the latest diff made in your current project. This allows you to seamlessly build codemods right from your IDE.

1

Make a change

Start by manually making change in a file that you would like to see repeated over many files in your project.

2

Run `codemod learn`

Open a terminal in your current project and run codemod learn. Codemod AI will use the diff of the latest edited file to automatically generate a codemod.

3

Building the codemod

Codemod Studio will automatically open, with pre-populated data, and begin building your codemod. Allow Codemod Studio to finish generating your codemod.

4

Export/publish the generated codemod

After Codemod Studio builds your codemod, you can easily export and run your codemod over your local project.

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Scaffolding a codemod package

Scaffolding a codemod package allows you to either:

  1. manually write your own codemod
  2. turn an existing codemod into a Codemod-compatible package.

To scaffold a new codemod package, you should:

1

Verify codemod engine compatibility

Verify that the existing codemod is built by one of the supported codemod engines.

2

Initialize codemod package

Initialize a Codemod-compatible package by running:

codemod init
3

Update transform file content

For jscodeshift/ts-morph/filemod codemods:

Update the content inside the src/index.ts file with the content of your codemod’s transform file.

For ast-grep codemods:

Update the content inside the src/rule.yaml file with the content of your ast-grep rule.

4

Update package configuration file

Add information about your codemod to the .codemodrc.json configuration file. Refer to .codemodrc.json reference here.

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Next steps

Publishing your codemod ->

Get started with publishing your codemod to Codemod Registry.

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