W0107: A .vuka.html file in the Go-header form

Since 2.3 a .vuka.html file holds its Go — package clause, imports, the struct, its hooks and methods — in a <script lang="go">, the file's first element, and its markup below it. Files written before 2.3 have the Go bare above the markup, which starts at the first line beginning with <. That form still compiles in 2.x and is removed in 3.0.

vukavet reports it, with a suggested fix that rewrites the file, and in the editor the code action Write the Go in <script lang="go"> does the same. vuka fix shape-script rewrites every file of a module, and vuka fmt -rewrite the files it formats; the Go and the markup are kept as written.

Wrong

<!-- counter.vuka.html -->
package components

type Counter struct{ n int }

func (c *Counter) Add() { c.n++ }
<button onClick={Add}>{n}</button>

Right

<!-- counter.vuka.html -->
<script lang="go">
package components

type Counter struct{ n int }

func (c *Counter) Add() { c.n++ }
</script>

<button onClick={Add}>{n}</button>