git.sr.ht/~mariusor/assets/examples/004-minified-fs

This is an example that's more elaborate and closer to real world use cases corresponding to a web application.

We have a ./static folder which contains all multiple types of files, CSS styles, JavaScript files, an SVG document and some other plain text or binary resources.

For the stylesheets, JavaScript files and the SVG document we want to minify them before using them as a assets in our binary.

Because //go:embed doesn't support adding functionality into the embed pipeline, we are forced to create our own generator, which creates a fs.FS compatible object, that we map our assets group on top of.

To use this example:

# the minify warnings can be ignored, the undeclared mount variable is what the script eventually generates
go generate main.go
minify: checking package: main.go:12:32: undeclared name: mount
minify: proceeding anyway...

go run main.go
2022/08/05 14:11:06 [GET] /main.js 3.006738ms

Load one file:

# since the example files are very simple, the only hint that they have
# been minified is the fact that there's no new line between the 
# two function calls.
curl http://localhost:6699/main.js
console.log("Hello!!!");console.error("Minification!!");