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// 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',
'headers',
'httpVersion',
'httpVersionMinor',
'httpVersionMajor',
'method',
'rawHeaders',
'rawTrailers',
'setTimeout',
'socket',
'statusCode',
'statusMessage',
'trailers',
'url',
];
export default function mimicResponse(fromStream, toStream) {
if (toStream._readableState.autoDestroy) {
throw new Error('The second stream must have the `autoDestroy` option set to `false`');
}
const fromProperties = new Set([...Object.keys(fromStream), ...knownProperties]);
const properties = {};
for (const property of fromProperties) {
// Don't overwrite existing properties.
if (property in toStream) {
continue;
}
properties[property] = {
get() {
const value = fromStream[property];
const isFunction = typeof value === 'function';
return isFunction ? value.bind(fromStream) : value;
},
set(value) {
fromStream[property] = value;
},
enumerable: true,
configurable: false,
};
}
Object.defineProperties(toStream, properties);
fromStream.once('aborted', () => {
toStream.destroy();
toStream.emit('aborted');
});
fromStream.once('close', () => {
if (fromStream.complete) {
if (toStream.readable) {
toStream.once('end', () => {
toStream.emit('close');
});
} else {
toStream.emit('close');
}
} else {
toStream.emit('close');
}
});
return toStream;
}
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