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coder/docs/about/contributing/documentation.md
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Nick Vigilante c84aa564ba docs: normalize code-fence languages for Shiki compatibility (#27161)
Normalizes non-standard code-fence language tags across `docs/**` so a
strict highlighter (Shiki, used by Fumadocs) won't fail the build on an
unrecognized language, and unifies redundant synonym tags onto one
canonical form per language. The current renderer (Speed-Highlight)
detects the language from the code content, not the fence label, so this
drift wasn't visible until now.

## Changes

- `hcl` -> `tf` (199 fences, including indented ones nested in
numbered/bulleted lists). Shiki ships `hcl` and `terraform` as two
distinct grammars (not aliases); every `hcl`-tagged fence in `docs/**`
is actually Terraform resource/data/provider syntax, so the more
specific `terraform` grammar is correct for all of them. `tf` is Shiki's
own alias for that grammar, and it's also what GitHub's own markdown
renderer resolves to the same HCL/Terraform highlighting.
- `pwsh`/`powershell` -> `ps1`. Both `ps` and `ps1` are registered
PowerShell aliases in Shiki, but on GitHub's renderer only `.ps1` is a
registered file extension (`.ps` isn't), so `ps1` renders identically to
`powershell` there today while bare `ps` would silently lose
highlighting.
- `env` -> `dotenv` (a dedicated Shiki grammar for `KEY=VALUE` files)
- `text`/`output`/`none`/`url` -> `txt`. Same built-in plain-text
fallback either way, just shorter.
- `Dockerfile` -> `dockerfile` (lowercase)
- `bash`/`shell` -> `sh` (732 fences). Shiki and GitHub both alias all
three to a single shell grammar; this was already the style guide's
stated preference, just not enforced across the existing corpus until
now.
- `markdown` -> `md` (4 fences). Alias of the same grammar in both Shiki
and GitHub.
- `jsonc` -> `json` (1 fence). The block has no comments or trailing
commas, so it doesn't need the comments-capable grammar.
- `ts` -> `tsx` (2 fences, `docs/about/contributing/frontend.md`).
Verified the actual content tokenizes identically under both grammars,
and a sibling block in the same file already needs `tsx` for real JSX,
so unifying to one tag is safe for this file. Documented a caveat: `tsx`
mis-tokenizes the legacy angle-bracket type-assertion syntax
(`<Type>value`), which is invalid in real `.tsx` files anyway, so use
`value as Type` instead.
- `yml` -> `yaml` (1 fence)
- Updated `docs/.style/style-guide/formatting.md` to document all
canonical tags

`promql` (2 fences) and `caddyfile` (2 fences) are left as-is. Shiki
doesn't bundle a grammar for either, so they need a custom grammar
registration when the site adopts Shiki, rather than degrading to `txt`.
Tracked as follow-up work under DOCS-118 and
[DOCS-544](https://linear.app/codercom/issue/DOCS-544/vendor-a-local-promql-grammar-for-shiki-syntax-highlighting)
(promql).

Does not touch `offlinedocs/`.

Linear:
[DOCS-476](https://linear.app/codercom/issue/DOCS-476/normalize-docs-code-fence-languages-de-risk-shikifumadocs)

<details>
<summary>How the fence tags were verified</summary>

Each tag was tested against a real `shiki@latest` highlighter instance
(`codeToHtml`/`codeToTokens`) and cross-checked against GitHub's
`@wooorm/starry-night` grammar sources (the renderer that actually
displays these `.md` files today, in repo browsing and PR diffs), since
that's what determines whether brevity is safe before Shiki adoption:

```text
FAIL  env        -- Language `env` is not included in this bundle.
FAIL  Dockerfile -- Language `Dockerfile` is not included in this bundle.
FAIL  promql     -- Language `promql` is not included in this bundle.
FAIL  caddyfile  -- Language `caddyfile` is not included in this bundle.
FAIL  pwsh       -- Language `pwsh` is not included in this bundle.
FAIL  output     -- Language `output` is not included in this bundle.
```

`hcl` doesn't error in Shiki, since it's a real grammar, but that's
exactly the trap: it was silently rendering every fence with the generic
HCL grammar instead of the Terraform-specific one. Every `hcl`-tagged
fence in `docs/**` was manually checked against `origin/main` and is
genuinely Terraform content.

For `ts`/`tsx`, tokenizing the actual doc content confirmed identical
output under both grammars; a synthetic test with the legacy
angle-bracket cast syntax confirmed `tsx` degrades on that specific
construct, which the style guide now calls out.

The first normalization pass only matched fence tags at column 0
(`^```tag$`), missing tags indented inside numbered/bulleted lists. A
follow-up pass caught the remaining occurrences at any indentation
level.

</details>


---

*This PR description and the underlying changes were prepared with Coder
Agents assistance.*
2026-07-15 14:07:09 -04:00

5.8 KiB

Documentation

This style guide is primarily for use with authoring documentation.

General guidelines

  • Use sentence case, even in titles (do not punctuate the title, though)
  • Use the second person
  • Use the active voice
  • Use plural nouns and pronouns (they, their, or them), especially when the specific number is uncertain (i.e., "Set up your environments" even though you don't know if the user will have one or many environments)
  • When writing documentation titles, use the noun form, not the gerund form (e.g., "Environment Management" instead of "Managing Environments")
  • Context matters when you decide whether to capitalize something or not. For example, "A Job creates one or more Pods..." is correct when writing about Kubernetes. However, in other contexts, neither job nor pods would be capitalized. Please follow the conventions set forth by the relevant companies and open source communities.

Third-party references

If you have questions that aren't explicitly covered by this guide, consult the following third-party references:

Type of guidance Third-party reference
Spelling Merriam-Webster.com
Style - nontechnical The Chicago Manual of Style
Style - technical Microsoft Writing Style Guide

Tools

This repository runs Vale on docs/ as part of CI to enforce prose style. The configuration is the repo-root .vale.ini, and the curated rule set is documented in docs/.style/style-guide/. Run the same checks locally with make lint/prose. Vale runs in advisory mode in this iteration: warnings surface as inline PR annotations, but they don't block the build.

The following external tools can also help when drafting. Take their suggestions with a grain of salt because they aren't tuned for Coder's voice or product names:

How to format text

Below summarizes the text-formatting conventions you should follow.

Bold

Use bold formatting when referring to UI elements.

Italics

Use italics for:

  • Parameter names
  • Mathematical and version variables

Code font

Use code font for:

  • User text input
  • Command-line utility names
  • DNS record types
  • Environment variable names (e.g., PATH)
  • Filenames, filename extensions, and paths
  • Folders and directories
  • HTTP verbs, status codes, and content-type values
  • Placeholder variables (see Placeholders in angle brackets)

Use code blocks for code samples and other blocks of code. Be sure to indicate the language your using to apply the proper syntax highlighting.

This is a codeblock.

For code that you want users to enter via a command-line interface, use console, not bash.

Placeholders in angle brackets

Placeholder values written in angle brackets must be wrapped in backticks so they render as inline code. The documentation site renders Markdown as HTML, so an unwrapped placeholder such as <organization-name> is parsed as an unknown HTML tag and stripped out of the page, so readers never see it.

This applies wherever the text becomes documentation, including the Go CLI help strings and Swagger annotations that generate the CLI and API reference.

# Correct: wrap the placeholder in backticks
Structured as: `<organization-name>/<team-slug>`.

# Incorrect: the placeholder renders as "Structured as: /."
Structured as: <organization-name>/<team-slug>.

Punctuation

Do not use the ampersand (&) as a shorthand for and unless you're referring to a UI element or the name of something that uses &.

You can use the symbol ~ in place of the word approximately.

UI elements

When referring to UI elements, including the names for buttons, menus, dialogs, and anything that has a name visible to the user, use bold font.

Example: On the Environment Overview page, click Configure SSH.

Don't use code font for UI elements unless it is rendered based on previously entered text. For example, if you tell the user to provide the environment name as myEnvironment, then use both bold and cold font when referring to the name.

Example: Click myEnvironment.

When writing out instructions that involve UI elements, both of the following options are acceptable:

  • Go to Manage > Users.
  • In the Manage menu, click Users.

Product-specific references

Below summarizes the guidelines regarding how Coder terms should be used.

Capitalized terms

The only Coder-specific terms that should be capitalized are the names of products (e.g., Coder).

The exception is code-server, which is always lowercase. If it appears at the beginning of the sentence, rewrite the sentence to avoid this usage.

Uncapitalized terms

In general, we do not capitalize the names of features (unless the situation calls for it, such as the word appearing at the beginning of a sentence):

  • account dormancy
  • audit logs
  • autostart
  • command-line interface
  • dev URLs
  • environment
  • image
  • metrics
  • organizations
  • progressive web app
  • registries
  • single sign-on
  • telemetry
  • workspace
  • workspace providers
  • workspaces as code

We also do not capitalize the names of user roles:

  • auditor
  • member
  • site admin
  • site manager

Standardized spellings

  • WiFi