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Checking Go templates for validity.

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# templatecheck

Check Go templates for validity.

Using `CheckedTemplate[T]`:

```
t := template.Must(template.ParseFiles("index.tmpl"))
ct, err := templatecheck.NewChecked[IndexData](t)
if err != nil { ... }
// ct cannot have type errors.
data := IndexData{...}
...
// ct.Execute's second argument must be of type IndexData.
if err := ct.Execute(w, data); err != nil { ... }
```

Using `CheckedTemplate[T]` is recommended, but may require changes
in how you write your templates and provide data to them.
For example, if your template contains

you can execute it with any value that has an `F` field or method.
Two different calls to `Template.Execute` can pass in two different
types, as long as each has `F`. With checked templates, you
must fix a single type to use for execution.

Using the `CheckXXX` functions:

```
t := template.Must(template.ParseFiles("index.tmpl"))
if err := templatecheck.CheckHTML(t, homePage{}); err != nil {
    log.Fatal(err)
}
```

See the [package documentation](https://pkg.go.dev/github.com/jba/templatecheck)
for details.

templatecheck

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