# Covergen Frontend

## Quick startup

For the frontend to function, the `covergen` wasm blob needs to be made available.
This is not present in-tree but is easily prepared by running `make prepare-frontend` in the parent directory 
(i.e. the repo root).
This will also do prepare the cross-cli's, but those are optional (you can run `make wasm-frontend` to just do the wasm).

After this the usual `vite` / `vue3` commands apply:

```shell
npm run dev
```

To prepare a proper final build:
```shell
npm run build
```

## A note on `wasm_exec.js`

Go WASM requires a 'helper' library, `wasm_exec.js` to help with the bridging memory from Go <-> JS.
This file is **different for each Go (1.XX) version**. The version bundled in-tree is for Go 1.16.
If you run a different version, you might need to copy it from your local golang dist folder, 
usually `/usr/local/go/misc/wasm/wasm_exec.js`.

If your distribution doesn't provide this file (e.g. Fedora) you can just copy it from the go main repo by going to
[https://github.com/golang/go/blob/master/misc/wasm/wasm_exec.js](https://github.com/golang/go/blob/master/misc/wasm/wasm_exec.js)
and using the GitHub branch selector to select the `release-branch.go1.XX` that matches your version of go (run `go version` to find out).