Documentation as Code
Documentation as code applies software engineering practices — version control, code review, automated testing, and CI/CD — to technical documentation. Writers use plain-text formats stored in repositories, building and deploying docs through the same pipelines as application code.
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Intro
Documentation as Code
Documentation as code treats documentation work like software development work. You write source files in plain-text markup. You store them in version control. You propose changes for review. Automated checks test the source before a publishing tool builds the reader-facing site.
The approach is a workflow, not a specific product. Markdown, Git, pull requests, continuous integration, and a static site generator are common parts. You can replace any one tool while preserving the workflow.
Why the approach exists
Product behavior and documentation often change together. A separate documentation process can let one change ship before the other. GitLab documents this timing problem directly. Its workflow encourages documentation in the same merge request as the related code.
Documentation as code gives both changes a shared review boundary. A reviewer can compare the documentation diff with the product diff. Automated checks can run on the same proposed change. The accepted commit then records what changed, who changed it, and when.
This approach also brings writers and engineers into a shared contribution system. Write the Docs identifies issue trackers, version control, plain-text markup, code review, and automated tests as its defining tools. The goal is shared ownership and closer integration with product teams.
The core pipeline
Think of the workflow as a sequence of evidence:
- An issue states the reader need and the required documentation change.
- An author edits plain-text source on a branch.
- A pull request shows the exact difference from the target branch.
- Automated checks test rules that machines can evaluate.
- People review technical meaning, editorial quality, and reader fit.
- The approved change merges into the authoritative branch.
- A build converts source into a site or another delivery format.
- Deployment publishes the built output.
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Sources
- https://www.writethedocs.org/guide/docs-as-code/
Supports
- Documentation as code as a philosophy of using development tools for documentation
- Issue trackers, version control, plain-text markup, code review, and automated tests as defining tools
- Shared ownership and closer integration between writers and development teams
- https://docs.gitlab.com/development/documentation/workflow/
Supports
- Planning documentation requirements with product work
- Technical, technical-writing, and maintainer review responsibilities
- Timing and visibility benefits of including documentation with related code
- Separate commits for a content move and subsequent content edits
- Documentation-specific continuous integration pipelines and documentation as part of definition of done
- https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request
Supports
- Pull requests as proposals to collaborate on changes from one branch to another
- Branch comparison and review before changes enter a target branch
- https://docs.github.com/en/get-started/start-your-journey/hello-world
Supports
- Branch, commit, pull-request, diff, review, and merge concepts in a basic GitHub flow
- Markdown as a text format used for repository documentation
- https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks
Supports
- Required status checks as merge gates on protected branches
- Successful current results as evidence required before merge
- Skipped, stale, or mismatched checks as possible causes of blocked changes
- https://www.mkdocs.org/
Supports
- Markdown documentation source with YAML configuration
- Local preview through a development server
- Static HTML output that can be hosted on several platforms
- A concrete separation between editable source and generated site output
- https://docs.vale.sh/
Supports
- Vale as code-like linting for prose
- Configurable rules focused on editorial style and consistency
- Markup-aware handling and the limits of a prose linter as a writing aid
- https://vale.sh/docs/cli
Supports
- Vale command-line use and configuration overrides
- Exit status one when linting errors are found
- Nonzero lint results as a mechanism suitable for failing continuous integration
- https://vale.sh/docs/styles
Supports
- YAML rule files and styles as Vale's configurable enforcement system
- Rule severity and targeted prose checks
- https://diataxis.fr/
Supports
- Tutorials, how-to guides, reference, and explanation as distinct documentation types
- Reader learning and working needs as the basis for choosing a content type
- https://developers.google.com/style/accessibility
Supports
- Descriptive headings, meaningful link treatment, and logical structure
- Text alternatives that summarize the intent of informative images
- Documentation meaning preserved without images, color, position, sound, or punctuation alone
- Keyboard access and human testing alongside authoring guidance