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    $plugins->on(output => $cb);
    $c->on(finish => sub { $plugins->unsubscribe(output => $cb); });
    $c->send({json => $last}) if $last;
  };
}
else {
  websocket '/stream' => sub {
    my $c    = shift;
    my $fork = _start_application($c);

    Scalar::Util::weaken($c);
    $c->on(finish => sub { $fork->kill($config->{kill_signal}); undef $fork; });
    $fork->on(close => sub { $c->send({json => {exit_value => $_[1], signal => $_[2]}})->finish });
    $fork->on(error => sub { $c->send({json => {error      => $_[1]}})->finish });
    $fork->on(read  => sub { $c->send({json => {output     => $_[1]}}) });
  };
}

app->start;

#=============================================================================