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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;
};
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