Method on

tooling/scripts/perf-web-runtime.mjs:372–376

(method, listener)

  }

  on(method, listener) {
    const listeners = this.listeners.get(method) ?? []
    listeners.push(listener)
    this.listeners.set(method, listeners)
  }

  waitFor(method, timeoutMs = 10000) {
    return new Promise((resolvePromise, rejectPromise) => {