build method
Implementation
String build([Map<String, dynamic>? variables]) {
var built = StringBuffer();
for (var e in _values) {
if (e is MessageVariable) {
built.write(e.build(variables));
} else if (e is MessageBlock) {
built.write(e.build(variables));
} else {
built.write(e);
}
}
return built.toString();
}