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89 lines
4.6 KiB
Markdown
89 lines
4.6 KiB
Markdown
# Primer Development
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If you've made it this far, **thank you**! We appreciate your contribution, and hope that this document helps you along the way.
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## Structure
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The project is structured as a [monorepo] made up of lots of small npm modules, many of which depend on each other. We use [Lerna] to manage, version, and publish all of the packages together.
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The top-level `package.json` is not published, but tracks common dependencies for developing Primer, and hosts some useful npm [run-scripts]. See the [scripts section](#scripts) for more info.
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## Workflow
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The typical Primer workflow looks something like this:
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1. [Install](#install)
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2. [Start Storybook](#storybook)
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3. Navigate to the module you're working on and modify the SCSS and/or markdown files.
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4. Test your changes in Storybook.
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5. Push your work to a new branch to test it on Travis and have it reviewed by the Primer "core" team.
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## Install
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Run `npm install` to install the npm dependencies and automatically run link all of the local packages together with `npm run bootstrap`.
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### Troubleshooting install problems
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If you run into trouble installing, it's always best to ensure that you're starting from a clean slate by running the following from the repository root directory:
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```sh
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npm run fresh
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```
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If _that_ gives you problems, then you can try manually deleting everything and starting over:
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```
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rm -rf node_modules
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rm -f package-lock.json */*/package-lock.json
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npm install
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```
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**You may need to do this whenever switching between branches with different dependencies, submodules, or versions of Node and/or npm.** The Primer core team generally uses the latest major version of Node (10 as of this writing), but our CI tests run Node 8 and npm 6. You can check which versions you're running with:
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```sh
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npm --version
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node --version
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```
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## Storybook
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Run `npm start` to start up [Storybook], then visit [localhost:3000](http://localhost:3000) to test your work. By default, all `html` code blocks of all `*.md` files in each module will be rendered as stories and listed under the module's name in the left-hand nav. File changes should trigger live reload automatically after a brief delay.
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If the package you're working on has a `stories.js`, it probably includes a snippet like this:
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```js
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const stories = storiesOf('Module name', module)
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storiesFromMarkdown(require.context('.', true, /\.md$/))
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.forEach(({title, story}) => {
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stories.add(title, story)
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})
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```
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This is how we find all of the Markdown files in the package directory and generate stories from their code blocks. Storybook sections are labeled by the first argument to `storiesOf()` (in the above example, "Module name"), and individual stories get their titles from either the previous Markdown heading or the `title` attribute in the fenced code block. See the [`code-blocks` docs](https://npmjs.com/package/code-blocks) and the [`storiesFromMarkdown()` source](./.storybook/lib/storiesFromMarkdown.js) for more info.
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## CSS packages
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All of the Primer CSS packages live in the [modules](./modules) subdirectory, including the [`primer`](./modules/package) omnibus package.
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## Tools
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Many tools specific to development of Primer CSS live in the [tools](./tools) subdirectory.
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## Scripts
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The [`script` directory](./script) houses a collection of scripts that we use to maintain, test, build, and publish packages. Some scripts of note:
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* `script/check-imports` compares the list of Primer npm dependencies for each package with SCSS `@import` statements in its source, and warns if any mismatches (dependencies without corresponding imports, or vice-versa) are found.
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* `script/compare-published` compares the latest published versions of each Primer CSS package with the `version` field in its local `package.json`, and reports any discrepancies.
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* `script/get-packages` lists all of the package subdirectories from both `modules` and `tools` directories, and is useful for iterating in shell scripts:
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```sh
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for pkg in $(script/get-packages); do
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echo $pkg
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done
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```
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If you're looking for more detail, you can also run `npx lerna ls`, which will list the packages by name along with their versions.
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Scripts like `lint-scss`, `notify`, and `test-docs` are called from individual packages to run specific common tasks; `npm-run` and `npm-run-all` are used more generally to run monorepo-installed npm utilities within the package directory, and can probably be refactored to simply run [npx].
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[monorepo]: https://github.com/babel/babel/blob/master/doc/design/monorepo.md
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[Lerna]: https://github.com/lerna/lerna
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[run-scripts]: https://docs.npmjs.com/cli/run-script
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[Storybook]: https://storybook.js.org/
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[npx]: https://www.npmjs.com/package/npx
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