[Flutter] How to write static classes in dart?

I am porting JSON5 to dart, and I want to keep the original convention.

The original code has a static class JSON5 which contains 2 static methods. But dart doesn't allow static classes.

My dart code:

/// static class, do not instanciate or inherit this
class JSON5 {
static String stringify(dynamic obj) { };
static dynamic parse(String json5String) { };
}


Is it possible to stop users from 2 things?

• instanciate the class: var json5 = JSON5()
• extends or implements the class: class DerivedJSON5 extends JSON5 {}

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