Method once

out/cli.cjs:414–417

(u3, F5)

        e3.push({ cb: F5 }), this.subscribers.set(u3, e3);
      }
      once(u3, F5) {
        const e3 = this.subscribers.get(u3) ?? [];
        e3.push({ cb: F5, once: true }), this.subscribers.set(u3, e3);
      }
      emit(u3, ...F5) {
        const e3 = this.subscribers.get(u3) ?? [], s2 = [];
        for (const C5 of e3) C5.cb(...F5), C5.once && s2.push(() => e3.splice(e3.indexOf(C5), 1));