Setting Default Values for Tags in TypeScript Contexts

import { Context, Effect } from "effect";

export class ContextWithDefault extends Context.Tag("ContextWithDefault")<
  ContextWithDefault,
  {
    someValue: number;
  }
>() {
  readonly default = ContextWithDefault.of({ someValue: 1 });
}

const program = Effect.gen(function* () { // would be Effect.Effect<void, never, never>
  const s = yield* ContextWithDefault; // uses default value if service isn't provided
})