fix: import BodyReadable and Dispatcher correctly (nodejs#1424)

* fix: import `BodyReadable` correctly

* fix: import `Dispatcher` correctly

* chore: fix `BodyReadable`'s import

Author: RA80533

test/types/readable.test-d.ts

@@ -1,5 +1,5 @@
 import { expectAssignable } from 'tsd'
-import BodyReadable from '../../types/readable'
+import BodyReadable = require('../../types/readable')
 import { Blob } from 'buffer'
 
 expectAssignable<BodyReadable>(new BodyReadable())

types/dispatcher.d.ts

@@ -3,7 +3,7 @@ import { Duplex, Readable, Writable } from 'stream'
 import { EventEmitter } from 'events'
 import { IncomingHttpHeaders } from 'http'
 import { Blob } from 'buffer'
-import BodyReadable from './readable'
+import BodyReadable = require('./readable')
 import { FormData } from './formdata'
 
 type AbortSignal = unknown;

types/mock-interceptor.d.ts

@@ -1,5 +1,5 @@
 import { IncomingHttpHeaders } from 'http'
-import Dispatcher from './dispatcher';
+import Dispatcher = require('./dispatcher');
 import { BodyInit, Headers } from './fetch'
 
 export {