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