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Deno Docs

This repository contains the website running docs.deno.com. The intent of this project is to eventually centralize all official Deno documentation content in a single website. The Deno Docs site is built using Docusaurus 2, a static site generator optimized for documentation websites.

The docs.deno.com website is hosted on Deno Deploy, where it is fronted by a Hono web server that handles redirects and other dynamic content requests as they become necessary.

Local development

Since Docusaurus is built and maintained using Node.js, it is recommended to have Node.js and npm installed for local development. Once Node and npm are installed, install Docusaurus' dependencies with:

npm install

You can then start the local development server with:

npm start

This will launch a browser window open to localhost:3000, where you will see any doc content changes you make update live.

To test the generated static site in a production configuration, run:

npm run build

This will generate a static site to the build folder locally. To test the production server (through the actual Deno / Hono server), run this command:

npm run serve

This will start a Deno server on localhost:8000, where you can preview the site as it will run on Deno Deploy.

Sometimes, after making a Docusaurus config change, you will run into an error and need to clean Docusaurus' generated assets. You can do this by running:

npm run clear

This will solve most errors you encounter while refactoring the site. Static assets will be rebuilt from scratch the next time you run npm run build or npm start.

Editing content

The actual content of the docs site is found mostly in these three folders:

  • runtime - docs for the Deno CLI / runtime
  • deploy - docs for the Deno Deploy cloud service
  • kv - docs for Deno KV, Deno's integrated database

Most files are markdown, but even markdown files are processed with MDX, which enables you to use JSX syntax within your markdown files.

Left navigation for the different doc sections are configured in one of these files:

  • sidebars/runtime.js - sidebar config for the Runtime section
  • sidebars/deploy.js - sidebar config for the Deno Deploy section
  • sidebars/kv.js - sidebar config for the KV section

Static files (like screenshots) can be included directly in the runtime, deploy, or kv folders, and referenced by relative URLs in your markdown.

Docusaurus provides a number of nice extensions to markdown you might want to use, like tabs, admonitions, and code blocks. Refer to the Docusaurus docs for more details.

Versioning docs content

Philosophically, we want to maintain as few discrete versions of the documentation as possible. This will reduce confusion for users (reduce the number of versions they need to think about), improve search indexing, and help us maintain the docs by keeping our build times faster.

In general, we should only version the documentation when we want to concurrently maintain several versions of the docs, like for major/LTS versions. For example - the Node.js docs are only versioned for major releases, like 20.x and 19.x. We will adopt this pattern as well, and won't have versioned docs for patch or feature releases.

For additive changes, it should usually be sufficient to indicate which version a feature or API was released in. For example - in the Node 20 docs, the register function is marked as being added in version 20.6.0.

When we do want to maintain versioned docs for major releases, we currently plan to use Docusaurus versions.

Including version numbers in code and content

It may occasionally be desirable to dynamically include the current Deno CLI or standard library version in content or code samples. We can accomplish this using the replacements.json file at the root of this repository.

Any values you would like to change once, and then have appear dynamically in a number of generated files, should be included in replacements.json.

In code samples (fenced with backticks), you can include a $ character, followed by the replacement variable name, directly within the code sample. When the markdown is transformed, the current version number will be replaced within it.

import { copy } from "https://deno.land/std@$STD_VERSION/fs/copy.ts";

To include version number in markdown / MDX content, we recommend using the <Replacement /> component:

import Replacement from "@site/src/components/Replacement";

The current CLI version is **<Replacement for="CLI_VERSION"/>**.

If you are writing inline JSX, you can also use the replacements object directly like so:

import { replacements } from "@site/src/components/Replacement";

<p>
  The current CLI version is <code>{ replacements.CLI_VERSION }</code>.
</p>

Server-side code and redirects

The Deno code that serves the site in production is in the src-deno folder. When the npm run build command is executed for a production Docusaurus build, it also copies the contents of the src-deno folder (unchanged) into the resulting build folder, which will be our project root for Deno Deploy.

Right now, there is just a very thin Hono server sitting on top of the static assets generated by Docusaurus. The only interesting job the Hono app has right now is handling redirects, of which there are several from the previous Deno doc sites.

To add a redirect, open src-deno/redirects.ts and configure a new route in the default exported function. The default status code of 301 should be sufficient for most cases.

New release process for Deno runtime

Let's say that a new minor release is ready for Deno, with CLI version 1.99 and standard library version 0.999.0. Here's how I would recommend approaching the docs for this release right now.

  • Create a feature branch for the release, like release_1_99 or similar
  • Update replacements.json with the upcoming CLI and standard lib versions
  • As the release is developed, add docs changes to this branch
  • When the release is ready, submit a PR to the main branch from this feature branch
  • When the branch is merged, create a v1.99 tag from the new main branch

For patch releases, I would recommend simply submitting pull requests to the main branch with relevant updates to replacements.json as required.

If we decide we'd like to have "canary" docs for upcoming versions, we can discuss how to make that possible with Docusaurus versions.

Contribution

We are very grateful for any help you can offer to improve Deno's documentation! For any small copy changes or fixes, please feel free to submit a pull request directly to the main branch of this repository.

For larger changes, please create a GitHub issue first to describe your proposed updates. It will be better to get feedback on your concept first before going to the trouble of writing a large number of docs!

Over time, we will add more in the way of linting and formatting to the pull request process. But for now, you should merely ensure that npm run build succeeds without error before submitting a pull request. This will ensure that there are no broken links or invalid MDX syntax in the content you have authored.

Special thanks for historical contributions

This repository was created using content from the Deno Manual, a project contributed to by hundreds of developers since 2018. You can view a list of historical contributors to the Deno documentation in this repository and the manual with this command:

git shortlog -s -n

Deployment

The docs.deno.com site is updated with every push to the main branch, which should be done via pull request to this repository.

License

MIT

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