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51 lines
2.9 KiB
Markdown
51 lines
2.9 KiB
Markdown
---
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title: Paths in Quartz
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---
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Paths are pretty complex to reason about because, especially for a static site generator, they can come from so many places.
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A full file path to a piece of content? Also a path. What about a slug for a piece of content? Yet another path.
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It would be silly to type these all as `string` and call it a day as it's pretty common to accidentally mistake one type of path for another. Unfortunately, TypeScript does not have [nominal types](https://en.wikipedia.org/wiki/Nominal_type_system) for type aliases meaning even if you made custom types of a server-side slug or a client-slug slug, you can still accidentally assign one to another and TypeScript wouldn't catch it.
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Luckily, we can mimic nominal typing using [brands](https://www.typescriptlang.org/play#example/nominal-typing).
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```typescript
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// instead of
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type FullSlug = string
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// we do
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type FullSlug = string & { __brand: "full" }
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// that way, the following will fail typechecking
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const slug: FullSlug = "some random string"
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```
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While this prevents most typing mistakes _within_ our nominal typing system (e.g. mistaking a server slug for a client slug), it doesn't prevent us from _accidentally_ mistaking a string for a client slug when we forcibly cast it.
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Thus, we still need to be careful when casting from a string to one of these nominal types in the 'entrypoints', illustrated with hexagon shapes in the diagram below.
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The following diagram draws the relationships between all the path sources, nominal path types, and what functions in `quartz/path.ts` convert between them.
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```mermaid
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graph LR
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Browser{{Browser}} --> Window{{Body}} & LinkElement{{Link Element}}
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Window --"getFullSlug()"--> FullSlug[Full Slug]
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LinkElement --".href"--> Relative[Relative URL]
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FullSlug --"simplifySlug()" --> SimpleSlug[Simple Slug]
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SimpleSlug --"pathToRoot()"--> Relative
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SimpleSlug --"resolveRelative()" --> Relative
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MD{{Markdown File}} --> FilePath{{File Path}} & Links[Markdown links]
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Links --"transformLink()"--> Relative
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FilePath --"slugifyFilePath()"--> FullSlug[Full Slug]
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style FullSlug stroke-width:4px
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```
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Here are the main types of slugs with a rough description of each type of path:
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- `FilePath`: a real file path to a file on disk. Cannot be relative and must have a file extension.
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- `FullSlug`: cannot be relative and may not have leading or trailing slashes. It can have `index` as it's last segment. Use this wherever possible is it's the most 'general' interpretation of a slug.
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- `SimpleSlug`: cannot be relative and shouldn't have `/index` as an ending or a file extension. It _can_ however have a trailing slash to indicate a folder path.
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- `RelativeURL`: must start with `.` or `..` to indicate it's a relative URL. Shouldn't have `/index` as an ending or a file extension but can contain a trailing slash.
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To get a clearer picture of how these relate to each other, take a look at the path tests in `quartz/path.test.ts`.
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