mirror of https://github.com/logos-co/roadmap.git
56 lines
3.2 KiB
Markdown
56 lines
3.2 KiB
Markdown
---
|
|
title: Paths in Quartz
|
|
---
|
|
|
|
Paths are pretty complex to reason about because, especially for a static site generator, they can come from so many places.
|
|
|
|
The current browser URL? Technically a path. A full file path to a piece of content? Also a path. What about a slug for a piece of content? Yet another path.
|
|
|
|
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.
|
|
|
|
Luckily, we can mimic nominal typing using [brands](https://www.typescriptlang.org/play#example/nominal-typing).
|
|
|
|
```typescript
|
|
// instead of
|
|
type ClientSlug = string
|
|
|
|
// we do
|
|
type ClientSlug = string & { __brand: "client" }
|
|
|
|
// that way, the following will fail typechecking
|
|
const slug: ClientSlug = "some random slug"
|
|
```
|
|
|
|
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.
|
|
|
|
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.
|
|
|
|
The following diagram draws the relationships between all the path sources, nominal path types, and what functions in `quartz/path.ts` convert between them.
|
|
|
|
```mermaid
|
|
graph LR
|
|
Browser{{Browser}} --> Window{{Window}} & LinkElement{{Link Element}}
|
|
Window --"getCanonicalSlug()"--> Canonical[Canonical Slug]
|
|
Window --"getClientSlug()"--> Client[Client Slug]
|
|
LinkElement --".href"--> Relative[Relative URL]
|
|
Client --"canonicalizeClient()"--> Canonical
|
|
Canonical --"pathToRoot()"--> Relative
|
|
Canonical --"resolveRelative()" --> Relative
|
|
MD{{Markdown File}} --> FilePath{{File Path}} & Links[Markdown links]
|
|
Links --"transformLink()"--> Relative
|
|
FilePath --"slugifyFilePath()"--> Server[Server Slug]
|
|
Server --> HTML["HTML File"]
|
|
Server --"canonicalizeServer()"--> Canonical
|
|
style Canonical stroke-width:4px
|
|
```
|
|
|
|
Here are the main types of slugs with a rough description of each type of path:
|
|
|
|
- `ClientSlug`: client-side slug, usually obtained through `window.location`. Contains the protocol (i.e. starts with `https://`)
|
|
- `CanonicalSlug`: should be used whenever you need to refer to the location of a file/note. Shouldn't be a relative path and shouldn't have leading or trailing slashes `/` either. Also shouldn't have `/index` as an ending or a file extension.
|
|
- `RelativeURL`: must start with `.` or `..` to indicate it's a relative URL. Shouldn't have `/index` as an ending or a file extension.
|
|
- `ServerSlug`: cannot be relative and may not have leading or trailing slashes.
|
|
- `FilePath`: a real file path to a file on disk. Cannot be relative and must have a file extension.
|
|
|
|
To get a clearer picture of how these relate to each other, take a look at the path tests in `quartz/path.test.ts`.
|