import * as dts from 'dts-element';

const getThing = dts.create_function_declaration({
  name: 'getThing',
  type: dts.create_function_type({
    parameters: [
      dts.create_parameter_declaration({
        name: 'x',
        type: dts.number_type,
      }),
    ],
    return: dts.void_type,
  }),
}); // equivalent to dts.parse('function getThing(x: number): void;').members[0];

const MyInterface = dts.create_interface_declaration({
  name: 'MyInterface',
  jsdoc: 'This is my nice interface',
  type: dts.create_object_type({
    members: [
      dts.create_object_member({
        optional: true,
        owned: getThing,
      }),
    ],
  }),
});

const SomeNamespace = dts.create_namespace_declaration({
  name: 'SomeNamespace',
  members: [MyInterface],
});

console.log(dts.emit(
  dts.create_top_level_element({
    members: [SomeNamespace],
  }),
));

declare namespace SomeNamespace {
    /**
      * This is my nice interface
      */
    interface MyInterface {
        getThing?(x: number): void;
    }
}