@mswjs/interceptors/src/interceptors/ClientRequest/utils/parserUtils.ts

Low-level HTTP/HTTPS/XHR/fetch request interception library.

import type { Socket } from 'node:net'
import { HTTPParser } from '_http_common'

/**
 * @see https://github.com/nodejs/node/blob/f3adc11e37b8bfaaa026ea85c1cf22e3a0e29ae9/lib/_http_common.js#L180
 */
export function freeParser(parser: HTTPParser<any>, socket?: Socket): void {
  if (parser._consumed) {
    parser.unconsume()
  }

  parser._headers = []
  parser._url = ''
  parser.socket = null
  parser.incoming = null
  parser.outgoing = null
  parser.maxHeaderPairs = 2000
  parser._consumed = false
  parser.onIncoming = null

  parser[HTTPParser.kOnHeaders] = null
  parser[HTTPParser.kOnHeadersComplete] = null
  parser[HTTPParser.kOnMessageBegin] = null
  parser[HTTPParser.kOnMessageComplete] = null
  parser[HTTPParser.kOnBody] = null
  parser[HTTPParser.kOnExecute] = null
  parser[HTTPParser.kOnTimeout] = null

  parser.remove()
  parser.free()

  if (socket) {
    /**
     * @note Unassigning the socket's parser will fail this assertion
     * if there's still some data being processed on the socket:
     * @see https://github.com/nodejs/node/blob/4e1f39b678b37017ac9baa0971e3aeecd3b67b51/lib/_http_client.js#L613
     */
    if (socket.destroyed) {
      // @ts-expect-error Node.js internals.
      socket.parser = null
    } else {
      socket.once('end', () => {
        // @ts-expect-error Node.js internals.
        socket.parser = null
      })
    }
  }
}