Remove run-time error

Author: ayrton

src/index.ts

@@ -186,12 +186,8 @@ export class Connection {
  private url: string
 
  constructor(config: Config) {
- if (!config.fetch && typeof fetch === 'undefined') {
- throw new Error('No `fetch` implementation available')
- }
-
- this.config = { ...config }
- this.fetch = config.fetch || fetch
+ this.config = config
+ this.fetch = config.fetch || fetch!
  this.session = null
 
  if (config.url) {