Method constructor

packages/service-worker/worker/testing/fetch.ts:62–74

(headers?: HeadersInit)

  map = new Map<string, string>();

  constructor(headers?: HeadersInit) {
    if (headers === undefined) {
      return;
    }

    if (Array.isArray(headers)) {
      headers.forEach(([name, value]) => this.set(name, value));
    } else if (headers instanceof MockHeaders || headers instanceof Headers) {
      headers.forEach((value, name) => this.set(name, value));
    } else {
      Object.entries(headers).forEach(([name, value]) => this.set(name, value));
    }
  }

  [Symbol.iterator]() {
    return this.map[Symbol.iterator]();