# Docusaurus → Blume

Docusaurus is a React site; navigation comes from `sidebars.js` (explicit or autogenerated) plus per-folder `_category_.json`. Admonitions are already directive syntax, which eases the content transform — **but note the source major version**: v2 (MDX v1) and v3 (MDX v3) have different content hazards, called out below.

## Detect

- **`docusaurus.config.{js,ts}`** at the root; a **`sidebars.{js,ts}`** file and per-folder **`_category_.json`** files.
- Content under **`docs/`** (often plus `blog/`, `src/pages/`, `static/`, `versioned_docs/`); `@docusaurus/*` deps.
- v2 vs v3: check the `@docusaurus/core` major in `package.json`.

## Config: `docusaurus.config` → `blume.config.ts`

Read `themeConfig`, `presets`, and `plugins`:

| Docusaurus | Blume |
| --- | --- |
| `title` | `title` |
| `tagline` | `description` |
| `themeConfig.navbar.title` / `.logo` | `title` / `logo` (move the image into `public/`) |
| `themeConfig.navbar.items` (doc items) | `navigation.tabs` (for section links) |
| `themeConfig.navbar.items` (external/utility links — Blog, GitHub, Discord…) | **`navigation.featured`** (`{ label, href, icon? }`, pinned above the sidebar on every route); the GitHub link → the `github` config instead |
| `themeConfig.colorMode.defaultMode` | `theme.mode` (`respectPrefersColorScheme: true` → `"system"`) |
| `themeConfig.prism.theme` / `.darkTheme` | `markdown.codeBlocks.theme: { light, dark }` (map Prism theme names to Shiki themes, e.g. `github`/`github-dark`) |
| `themeConfig.metadata` / `themeConfig.image` | per-page `seo` frontmatter / `seo.og`; report what doesn't fit |
| `url` + `baseUrl` | **`url` → drop** (`deployment.site` auto-detects); `baseUrl` (when not `/`) → `deployment.base` |
| preset `docs.routeBasePath` — **including the default!** | Docusaurus serves docs at **`/docs/…` by default**; the "map only declared fields" rule does **not** apply here because the _URLs_ are load-bearing. Either keep them with top-level **`basePath: "/docs"`** (invisible to the sidebar), or intentionally move to root and emit a `redirects` entry per page. Decide explicitly and say which. (`routeBasePath: '/'` = docs-only mode — nothing to do.) |
| preset `docs.editUrl` | `github` (owner/repo/branch; a path after the branch → `github.dir`) |
| `themeConfig.footer` | drop → Footer override (`defineComponents` layout slot) |
| `themeConfig.announcementBar` | `banner` (`{ content, dismissible, id }` — `isCloseable` → `dismissible`; colors drop) |
| `i18n.locales` / `defaultLocale` | `i18n` — translated files live at `i18n/<locale>/docusaurus-plugin-content-docs/current/…`; move them to `<locale>/…` under `content.root` |
| `themeConfig.algolia` | drop — Blume ships built-in search (Orama); remove the Algolia dep |
| `@docusaurus/plugin-client-redirects` | **static `redirects: [{from, to}]` arrays convert 1:1** to Blume `redirects` (a `from` array = one entry per item); only `createRedirects` functions are truly dynamic → host rules |
| `@docusaurus/theme-mermaid` | delete the dep — ` ```mermaid ` renders natively (in `.mdx`) |
| `remark-math` + `rehype-katex` | delete — block `$$…$$` renders in `.mdx` with no config (no `markdown.math` field exists); **inline `$…$` is not supported** — convert or drop (report) |
| Multi-instance docs plugins (`plugin-content-docs` with `id`) | one folder (and usually one `navigation.tabs` entry) per instance |

## Static assets — required move

Every Docusaurus repo serves **`static/`** at the site root (`static/img/foo.png` → `/img/foo.png`). Blume serves **`public/`**. **Move `static/*` (and any extra `staticDirectories`) into `public/`** — all root-relative references then keep resolving unchanged. Without this, every image and download 404s.

## Navigation: `sidebars.js` + `_category_.json`

- **Autogenerated sidebar** (`{ type: 'autogenerated', dirName: '...' }`) → Blume's default filesystem navigation. Docusaurus strips numeric prefixes (`01-`) exactly like Blume, so the convention round-trips; no config needed.
- **Explicit sidebar** (arrays of doc IDs, categories, links) → restructure into folders where possible; use `navigation.sidebar` only for shapes files can't express. A category `{ type: 'category', label, items }` → a folder (label → `meta.ts` `title`); `collapsed` → `meta.ts` `collapsed`, and collapsible rendering → that folder's `meta.ts` `display: "group"` (or `navigation.sidebar.display: "group"` once in config when every category collapses).
- **`_category_.json`** (also `.yml`) (`{ label, position, collapsed, collapsible, link, className, customProps }`) → a folder `meta.ts`: `label`→`title`, `position`→`order`, `collapsed`→`collapsed`. `link.type: 'generated-index'` → an `index` page in the folder — **and the old URL was `/docs/category/<slug>`**, so add a redirect and rewrite inbound links. `link.type: 'doc'` → make that doc the folder's `index`. `collapsible`/`className`/`customProps` → drop (report).
- **`src/pages/` — inventory, don't nuke.** Nearly every repo has a React landing page (`src/pages/index.tsx`) and often extra Markdown pages. Markdown pages → content pages; the React home page → rebuild as a docs index or a custom `.astro` page under `content.pages` — report either way.

## Versioned docs

Docusaurus `versioned_docs/version-X/` + `versions.json` (+ `versioned_sidebars/`) → **recommend migrating the latest released version only**. Mind the URL scheme: by default the **latest release** serves at `/docs/` and the work-in-progress `docs/` folder serves at `/docs/next` (`lastVersion: 'current'` flips this) — pick the folder that matches what users see at `/docs/`. If older versions must stay, put each under its own folder and wire a `navigation.selectors` entry of `kind: "version"`.

## Blog

A Docusaurus `blog/` → Blume `type: blog` pages. **Dates come from filenames/folders** (`2024-01-31-foo.md`) — extract each into `date` frontmatter and strip the date from the filename (the old dated URLs `/blog/2024/01/31/foo` need `redirects`). Strip `<!-- truncate -->` / `{/* truncate */}` markers. `authors.yml` refs → inline author objects in each post's `authors` frontmatter. RSS stays at `/blog/rss.xml` on both sides.

## Content & components

- **`.md` vs `.mdx` — both majors need renames, for opposite reasons.** Blume parses `.md` as plain Markdown: no directives, no JSX, no `$$` math, no mermaid/package-install fences. **v3** treats `.md` as MDX (so a `.md` with imports/JSX/`{}` renders them as literal text in Blume); **v2** content is looser MDX v1. Rule: **rename any `.md` that contains admonitions, JSX, imports, or math to `.mdx`** — for typical Docusaurus repos that is most files.
- **Admonitions are directives — but check the version.** v3: `:::note`, `:::tip`, `:::info`, `:::warning`, `:::danger` pass through; `:::caution` → `:::warning` (or rely on Blume's alias); titles `:::note[Title]` work. **v2:** titles are space-separated (`:::note Your Title`) — rewrite to brackets or the title is silently lost; and v2's `:::warning` rendered **red/danger** — audit whether it should become `:::danger`.
- **Tabs:** `<Tabs>`/`<TabItem label="…" value="…">` → `<Tabs>`/`<Tab title="…">`. Drop `groupId`/`queryString`/`value`; strip the `@theme/Tabs` imports.
- **Theme JSX in content:** `<DocCardList/>` (standard on category index pages) → hand-write `Card`/`CardGroup` links or delete (a Blume group page lists its children); `<TOCInline/>` → drop (report); `<CodeBlock>` JSX → a fenced code block; `<Admonition>` → the matching directive; `<details>`/`<summary>` → `<Accordion>`/`<AccordionItem>` or leave as raw HTML.
- **`@theme/*` / `@site/*` imports** — strip `@theme/*` (Blume injects components globally); rewrite `@site/` asset/module paths to `/public` URLs or inline. **MDX partials** (`_partial.mdx` imports) → inline the partial's body (Blume's default `**/_*` exclude already hides the partial files themselves).
- **Code blocks:** `title="file.js"` → works as-is; `showLineNumbers` → `lineNumbers`; **magic comments** (`// highlight-next-line`, `highlight-start`/`end`) → `{ranges}` or `// [!code highlight]` — unconverted they ship as literal comments in every sample; ` ```bash npm2yarn ` → ` ```package-install `.
- **MDX v1 (v2 sources) pitfalls:** unescaped `<`/`{` in prose, HTML comments `<!-- -->` (→ `{/* */}`), string `style="…"` attributes (→ objects). Fix as build errors surface.

## Frontmatter

| Docusaurus | Blume |
| --- | --- |
| `title` / `description` | pass through |
| `id` | usually drop (routing is filesystem-based); use `slug` to pin a route |
| `slug` | `slug` |
| `sidebar_label` | `sidebar.label` |
| `sidebar_position` | `sidebar.order` |
| `unlisted` | `hidden: true` + `noindex: true` |
| `last_update.date` | `lastModified` |
| `draft` | `draft` |
| `tags` | `search.tags` (or drop if only used for the blog tag index) |
| `image` | `seo.image` |
| `keywords` | drop → use `seo` |
| `sidebar_class_name` / `sidebar_custom_props` / `pagination_next` / `pagination_prev` / `pagination_label` / `hide_title` / `hide_table_of_contents` / `toc_min_heading_level` / `toc_max_heading_level` / `displayed_sidebar` / `custom_edit_url` | drop (report) |

Remove any duplicated H1 in the body — `title` renders the H1.

## Icons

Docusaurus has no built-in icon-name system (icons are usually inline SVG/emoji/CSS). Where you add sidebar/tab icons, use Lucide names. Convert any FontAwesome/react-icons usage in content to Lucide `<Icon>` or drop it.

## Teardown

Remove `@docusaurus/*` and Algolia deps; delete `docusaurus.config.*`, `sidebars.*`, `babel.config.js`, and `src/` theme customizations (after the `src/pages/` inventory above; re-implement what matters via `defineComponents` layout slots or `blume eject`). Repoint `start`/`build`/`serve` scripts → `blume dev`/`blume build`/`blume preview`; add `blume`.

## Dropped — report these

Custom/swizzled theme components (layout slots or `blume eject`), footer columns, Algolia config, `sidebar_custom_props` and the other dropped frontmatter keys, `createRedirects` functions (→ host rules), React pages under `src/pages/`, `<TOCInline>`, per-category `className`/`customProps`, and any `@theme/*` component with no Blume equivalent.