Asset Fetching

Often when using SSR and SSG you'll need to access asset files such as .json, .md and .txt files.

#fetchTextAsset and fetchJsonAsset

To support this, are two helper functions:

• async fetchTextAsset(url) - fetch a text asset
• async fetchJsonAsset(url) - fetch a JSON asset

On the browser, these functions make a web request using fetch API. On the server, the assets are loaded with fs.readFile().

In both cases

• The url must be absolute (ie: start with a '/') which is resolved against the root directory of the project.
• When using a urlMapper with a base directory, the base will be prefixed to any fetch request ie: the url should be the internalized version.
• Both functions are async and return a Promise for the value, or the promise is rejected.

Only get/read functionality is provided because these functions are designed to be used in rendering environments where posting or saving assets shouldn't be done anyway.