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https://github.com/nix-community/npmlock2nix

nixify npm based packages [maintainer=@andir]
https://github.com/nix-community/npmlock2nix

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nixify npm based packages [maintainer=@andir]

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[![Tests][test-shield]][test-url]

[![Matrix][matrix-shield]][matrix-url]








  
npmlock2nix


  


    Simple and unit tested solution to nixify npm based packages.

  



## About



_npmlock2nix_ is a Nix based library that parses the `package.json` and `package-lock.json` files in order to provide different outputs:



1. A `shell` environment

1. A `node_modules` derivation

1. A custom `build` derivation



### Features



- No auto-generated code :heavy_check_mark:

- Works in restricted evaluation :heavy_check_mark:

- GitHub dependencies :heavy_check_mark:

- Unit Tests :heavy_check_mark:

- Integration Tests :heavy_check_mark:



## Getting Started



Since `npmlock2nix` is written entirely in Nix, there aren't any additional prerequisites, it just needs to be imported into your project.



### Installation



The preferred way to provide _npmlock2nix_ to your project is via [niv][niv-url]:



```shell

$ niv add nix-community/npmlock2nix

```



Assuming you are also tracking nixpkgs via niv, you can then provide _npmlock2nix_ to your project as a [nixpkgs overlay][overlay-link]



```nix

# nix/default.nix

let

  sources = import ./sources.nix;

in

  import sources.nixpkgs {

    overlays = [

      (self: super: {

        npmlock2nix = pkgs.callPackage sources.npmlock2nix { };

      })

    ];

  }

```



Assuming the setup above, you can import `nix/default.nix` which will yield a nixpkgs set containing _npmlock2nix_.



## Usage



The following sections outline the main use-case scenarios of _npmlock2nix_.



**Note**: All examples only reflect the most basic scenarios and mandatory arguments. For more details please refer to the [API documentation][api-url].



**Note**: All code snippets provided below assume that _npmlock2nix_ has been imported and is inn scope and that there are valid `package.json` and `package-lock.json` files in the project root.



### Providing A Shell



```nix

npmlock2nix.shell {

  src = ./.;

}

```

The `shell` function creates an environment with the `node_modules` installed that can be used for development purposes.



Please refer to the [API documentation][api-url] for additional information on `shell`.



### Building `node_modules`



```nix

npmlock2nix.node_modules {

  src = ./.;

}

```

The `node_modules` function creates a derivation containing the equivalent of running `npm install` in an impure environment.



Please refer to the [API documentation][api-url] for additional information on `node_modules`.



### Building A Project



```nix

npmlock2nix.build {

  src = ./.;

  installPhase = "cp -r dist $out";

  buildCommands = [ "npm run build" ];

}

```

The `build` function can be used to package arbitrary npm based projects. In order for this to work,

_npmlock2nix_ must be told how to build the project (`buildCommands`) and how to install it (`installPhase`).



Please refer to the [API documentation][api-url] for additional information on `build`.



## Contributing



Contributions to this project are welcome in the form of GitHub Issues or PRs. Please consider the following before creating PRs:



- This project uses nixpkgs-fmt for formatting the Nix code. You can use `nix-shell --run "nixpkgs-fmt ."` to format everything.

- If you are planning to make any considerable changes, you should first present your plans in a GitHub issue so it can be discussed

- _npmlock2nix_ is developed with a strong emphasis on testing. Please consider providing tests along with your contributions and don't hesitate to ask for support.



## Development



When working on _npmlock2nix_ it's highly recommended to use [direnv][direnv-url] and the project's `shell.nix` which provides:



- A commit hook for code formatting via [nix-pre-commit-hooks][nix-pre-commit-hooks-url].

- A `test-runner` script that watches the source tree and runs the unit tests on changes.



The integration tests can be executed via `nix-build -A tests.integration-tests`.



## License



Distributed under the Apache 2.0 License. See [license][license-url] for more details



## Acknowledgements



- [nixpkgs-fmt][nixpkgs-fmt-url]

- [direnv][direnv-url]

- [niv][niv-url]

- [nix-pre-commit-hooks][nix-pre-commit-hooks-url]

- [entr][entr-url]

- [smoke][smoke-url]



[contributors-shield]: https://img.shields.io/github/contributors/othneildrew/Best-README-Template.svg?style=for-the-badge

[contributors-url]: https://github.com/othneildrew/Best-README-Template/graphs/contributors

[issues-shield]: https://img.shields.io/github/issues/Tweag/npmlock2nix.svg?style=for-the-badge

[issues-url]: https://github.com/Tweag/npmlock2nix/issues

[license-shield]: https://img.shields.io/github/license/Tweag/npmlock2nix.svg?style=for-the-badge

[license-url]: https://github.com/Tweag/npmlock2nix/blob/master/LICENSE

[test-shield]: https://img.shields.io/github/workflow/status/Tweag/npmlock2nix/Tests/master?style=for-the-badge

[test-url]: https://github.com/Tweag/npmlock2nix/actions

[pr-shield]: https://img.shields.io/github/issues-pr/Tweag/npmlock2nix.svg?style=for-the-badge

[pr-url]: https://github.com/Tweag/npmlock2nix/pulls

[matrix-shield]: https://img.shields.io/matrix/npmlock2nix:nixos.dev.svg?server_fqdn=matrix.nixos.dev&style=for-the-badge

[matrix-url]: https://matrix.to/#/#npmlock2nix:nixos.dev



[niv-url]: https://github.com/nmattia/niv

[overlay-link]: https://nixos.org/manual/nixpkgs/stable/#chap-overlays

[api-url]: ./API.md

[direnv-url]: https://direnv.net/

[nix-pre-commit-hooks-url]: https://github.com/cachix/pre-commit-hooks.nix

[nixpkgs-fmt-url]: https://github.com/nix-community/nixpkgs-fmt

[entr-url]: https://github.com/clibs/entr

[smoke-url]: https://github.com/SamirTalwar/Smoke