feat(client): add proxy object for request.agent for compatibility#1839
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titanism merged 1 commit intoforwardemail:masterfrom Jan 6, 2026
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In node environments, the code in `node/agent.js` creates a proxy object around `Agent` so that it can be instantiated without using the `new` keyword. The equivalent code for the browser version (in `client.js`) defines `request.agent` as `() => new Agent()`. In supertest, the `TestAgent` attempts to subclass `Agent` with the call `Object.setPrototypeOf(TestAgent.prototype, Agent.prototype);`. This works in the node environment but not in the browser version, because in the browser version `() => new Agent()` is not an object and has an undefined prototype, leading to the error message `Object prototype may only be an Object or null: undefined`. Wrap `request.agent` in a proxy object for the client/browser case so that supertest can also use the library in browser contexts without error.
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Fixes #1840 |
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Any chance someone can look at this patch? This issue is making it trickier to keep all our testing libraries up-to-date (https://phabricator.wikimedia.org/T405027). |
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v10.3.0 of superagent and v7.2.0 supertest published to npm with qs fixed https://github.com/forwardemail/superagent/releases/tag/v10.3.0 please consider supporting our maintenance efforts by becoming a @forwardemail user! sign up at https://forwardemail.net and use coupon code a few KB is not too bad for features that qs offers, it's maintained as well |
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In node environments, the code in
node/agent.jscreates a proxy object aroundAgentso that it can be instantiated without using thenewkeyword. The equivalent code for the browser version (inclient.js) definesrequest.agentas() => new Agent().In supertest, the
TestAgentattempts to subclassAgentwith the callObject.setPrototypeOf(TestAgent.prototype, Agent.prototype);. This works in the node environment but not in the browser version, because in the browser version() => new Agent()is not an object and has an undefined prototype, leading to the error messageObject prototype may only be an Object or null: undefined.Wrap
request.agentin a proxy object for the client/browser case so that supertest can also use the library in browser contexts without error.Checklist