mirror of
https://github.com/lovell/sharp.git
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99 lines
3.6 KiB
Markdown
99 lines
3.6 KiB
Markdown
# Contributing to sharp
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Hello, thank you for your interest in helping!
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## Submit a new bug report
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Please create a [new issue](https://github.com/lovell/sharp/issues/new) containing the steps to reproduce the problem.
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If you're having installation problems, please include the output of running `npm install --verbose sharp`.
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New bugs are assigned a `triage` label whilst under investigation.
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## Submit a new feature request
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If a [similar request](https://github.com/lovell/sharp/labels/enhancement) exists,
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it's probably fastest to add a comment to it about your requirement.
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Implementation is usually straightforward if libvips
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[already supports](https://www.libvips.org/API/current/func-list.html)
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the feature you need.
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## Submit a Pull Request to fix a bug
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Thank you! To prevent the problem occurring again, please add unit tests that would have failed.
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Please select the `main` branch as the destination for your Pull Request so your fix can be included in the next minor release.
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Please squash your changes into a single commit using a command like `git rebase -i upstream/main`.
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To test C++ changes, you can compile the module using `npm install --build-from-source` and then run the tests using `npm test`.
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## Submit a Pull Request with a new feature
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Please add JavaScript [unit tests](https://github.com/lovell/sharp/tree/main/test/unit) to cover your new feature.
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A test coverage report for the JavaScript code is generated in the `coverage/lcov-report` directory.
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Please also update the [TypeScript definitions](https://github.com/lovell/sharp/tree/main/lib/index.d.ts), along with the [type definition tests](https://github.com/lovell/sharp/tree/main/test/types/sharp.test-d.ts).
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Where possible, the functional tests use gradient-based perceptual hashes
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based on [dHash](http://www.hackerfactor.com/blog/index.php?/archives/529-Kind-of-Like-That.html)
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to compare expected vs actual images.
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You deserve to add your details to the [list of contributors](https://github.com/lovell/sharp/blob/main/package.json#L5).
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Any change that modifies the existing public API should be added to the relevant work-in-progress branch for inclusion in the next major release.
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Please squash your changes into a single commit using a command like `git rebase -i upstream/<wip-branch>`.
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### Add a new public method
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The API tries to be as fluent as possible.
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Image processing concepts follow the naming conventions from libvips and, to a lesser extent, ImageMagick.
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Most methods have optional parameters and assume sensible defaults.
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Please ensure backwards compatibility where possible.
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Feel free to create a [new issue](https://github.com/lovell/sharp/issues/new) to gather feedback on a potential API change.
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### Remove an existing public method
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A method to be removed should be deprecated in the next major version then removed in the following major version.
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By way of example, the `background()` method present in v0.20.0 was deprecated in v0.21.0 and removed in v0.22.0.
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## Documentation
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The public API is documented with [JSDoc](https://jsdoc.app/) annotated comments.
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These can be converted to Markdown by running:
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```sh
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npm run docs-build
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```
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Please include documentation updates in any Pull Request that modifies the public API.
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## Run the tests
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### Functional tests and static code analysis
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```sh
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npm test
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```
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### Memory leak tests
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Requires [Valgrind](http://valgrind.org/).
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```sh
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npm run test-leak
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```
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## Finally
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Please feel free to ask any questions via a
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[new issue](https://github.com/lovell/sharp/issues/new).
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If you're unable to post details publicly, please
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[e-mail](https://github.com/lovell/sharp/blob/main/package.json#L5)
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for private, paid consulting.
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