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catch.go
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catch.go
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//go:build js && wasm
// Package catch runs functions and returns panic values as errors instead.
package catch
import (
"fmt"
"syscall/js"
"github.com/hack-pad/safejs/internal/stackerr"
)
// Try runs fn and returns the result. If fn panicked, the panic value is returned as an error instead.
func Try[Result any](fn func() Result) (result Result, err error) {
defer recoverErr(&err)
result = fn()
return
}
// TrySideEffect is like Try, but does not have a return value.
func TrySideEffect(fn func()) (err error) {
defer recoverErr(&err)
fn()
return
}
func recoverErr(err *error) {
value := recover()
valueErr := recoverValueToError(value)
if valueErr != nil {
*err = stackerr.WithStack(valueErr)
}
}
func recoverValueToError(value any) error {
if value == nil {
return nil
}
switch value := value.(type) {
case error:
return value
case js.Value:
return js.Error{Value: value}
default:
return fmt.Errorf("%+v", value)
}
}