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| 'use strict';
|
| // We define these manually to ensure they're always copied
| // even if they would move up the prototype chain
| // https://nodejs.org/api/http.html#http_class_http_incomingmessage
| const knownProperties = [
| 'aborted',
| 'complete',
| 'destroy',
| 'headers',
| 'httpVersion',
| 'httpVersionMinor',
| 'httpVersionMajor',
| 'method',
| 'rawHeaders',
| 'rawTrailers',
| 'setTimeout',
| 'socket',
| 'statusCode',
| 'statusMessage',
| 'trailers',
| 'url'
| ];
|
| module.exports = (fromStream, toStream) => {
| const fromProperties = new Set(Object.keys(fromStream).concat(knownProperties));
|
| for (const property of fromProperties) {
| // Don't overwrite existing properties.
| if (property in toStream) {
| continue;
| }
|
| toStream[property] = typeof fromStream[property] === 'function' ? fromStream[property].bind(fromStream) : fromStream[property];
| }
|
| return toStream;
| };
|
|
