fetch-headers/test/http-loader.js

fetch Headers

import { get } from 'https'

/**
 * @param {string} specifier
 * @param {{
 *   conditions: !Array<string>,
 *   parentURL: !(string | undefined),
 * }} context
 * @param {Function} defaultResolve
 * @returns {Promise<{ url: string }>}
 */

export async function resolve (specifier, context, defaultResolve) {
  const { parentURL = null } = context

  // Normally Node.js would error on specifiers starting with 'https://', so
  // this hook intercepts them and converts them into absolute URLs to be
  // passed along to the later hooks below.
  if (specifier.startsWith('https://')) {
    return {
      url: specifier
    }
  } else if (parentURL && parentURL.startsWith('https://')) {
    return {
      url: new URL(specifier, parentURL).href
    }
  }

  // Let Node.js handle all other specifiers.
  return defaultResolve(specifier, context, defaultResolve)
}

export function load (url, context, defaultLoad) {
  // For JavaScript to be loaded over the network, we need to fetch and
  // return it.
  if (url.startsWith('https://')) {
    return new Promise((resolve, reject) => {
      get(url, (res) => {
        let data = ''
        res.on('data', (chunk) => data += chunk)
        res.on('end', () => resolve({
          // This example assumes all network-provided JavaScript is ES module
          // code.
          format: 'module',
          source: data
        }))
      }).on('error', (err) => reject(err))
    })
  }

  // Let Node.js handle all other URLs.
  return defaultLoad(url, context, defaultLoad)
}