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/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
import '../_version.js';
/**
* This is a utility method that determines whether the current browser supports
* the features required to create streamed responses. Currently, it checks if
* [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/ReadableStream)
* is available.
*
* @private
* @param {HeadersInit} [headersInit] If there's no `Content-Type` specified,
* `'text/html'` will be used by default.
* @return {boolean} `true`, if the current browser meets the requirements for
* streaming responses, and `false` otherwise.
*
* @memberof workbox-streams
*/
function createHeaders(headersInit = {}) {
// See https://github.com/GoogleChrome/workbox/issues/1461
const headers = new Headers(headersInit);
if (!headers.has('content-type')) {
headers.set('content-type', 'text/html');
}
return headers;
}
export { createHeaders };