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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 knownProps = [
'destroy',
'setTimeout',
'socket',
'headers',
'trailers',
'rawHeaders',
'statusCode',
'httpVersion',
'httpVersionMinor',
'httpVersionMajor',
'rawTrailers',
'statusMessage'
];
module.exports = (fromStream, toStream) => {
const fromProps = new Set(Object.keys(fromStream).concat(knownProps));
for (const prop of fromProps) {
// Don't overwrite existing properties
if (prop in toStream) {
continue;
}
toStream[prop] = typeof fromStream[prop] === 'function' ? fromStream[prop].bind(fromStream) : fromStream[prop];
}
};
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