Implementing a DSL with Pipable Methods in a Custom Class

// biome-ignore lint: suspicious/noUnsafeDeclarationMerging
class PrometheusMetric extends Schema.Class<PrometheusMetric>(
  "PrometheusMetric"
)({
  key: Schema.String,
  type: Schema.Union(Schema.Literal("counter"), Schema.Literal("gauge")),
  help: Schema.optional(Schema.String),
}) {
  static gauge(key: string) {
    return PrometheusMetric.make({ key, type: "gauge" });
  }

  static counter(key: string) {
    return PrometheusMetric.make({ key, type: "counter" });
  }

  static withHelp: {
    (help: string): <Self>(self: Self) => Self & { help: string };
    <Self>(self: Self, help: string): Self & { help: string };
  } = dual(2, (self, help) => {
    return PrometheusMetric.make({ ...self, help });
  });

}
PrometheusMetric.prototype.pipe = function () {
  // biome-ignore lint/style/noArguments
  return pipeArguments(this, arguments);
};

interface PrometheusMetric extends Pipeable.Pipeable {}