Patch a buggy NPM package without forking it.
Based on the handy diff package (there is a
jsdiff published on the NPM registry but it is a bogus one)
This tool does what patch-package does (or more accurately - should be doing) but without the related issues:
- it works faster, especially when creating the patch
- it never chokes on its own patches
- it does not break if you try to apply a patch more than once (but shows a warning)
- it does not require/depend on GIT
When you have made a bugfix for one of your dependencies but the author/maintainers refuse to accept your PR - you do not need to fork the package. Create a patch and seamlessly apply it locally for all your builds.
npm install custompatch -g
It operates in exactly the same way as patch-package so you can use the same setup if you have it already.
Add the following to your
Open your IDE and make the required changes for the bugfix inside your dependency in
node_modules. After that run
This will create a folder called
patches inside your project and a file called
email@example.com in this folder.
This file will be a unified diff between your fixed version of the dependency and its original code.
You can specify more than 1 package on the command-line - but no command-line options are accepted.
The process is exactly the same as for creating a patch for the first time.
custompatch without arguments inside your project folder - it will apply all the patches from
Currently there is no possibility to apply only the patch for a specific dependency. Also, it is not yet possible to undo a patch.
Perhaps the command-line utility
patch can do the job but this has not been tested:
patch -p1 -i firstname.lastname@example.org
Benefits of patching over forking
- Forks often require extra build steps - and even more often you do not need this overhead
- CustomPatch warns you when a patch was not applied cleanly - so that you can check that your fix is still valid for the new version of dependency
- Keep your patches colocated with the code that depends on them
- Patches can be reviewed as part of your normal review process, forks probably can't
Software License Agreement (BSD License)
Copyright (c) 2018, IVO GELOV
All rights reserved.
Redistribution and use of this software in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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