fix[react-devtools]: remove all listeners when Agent is shutdown #31151
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EdmondChuiHW
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Oct 9, 2024
| @@ -754,6 +754,9 @@ export default class Agent extends EventEmitter<{ | |||
| shutdown: () => void = () => { | |||
| // Clean up the overlay if visible, and associated events. | |||
| this.emit('shutdown'); | |||
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| this._bridge.removeAllListeners(); | |||
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Is this safe? What happens if other objects are listening to the shutdown event too?
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It is safe, because Agent is actually notified by Bridge here:
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Talked irl. What I was asking was
- ProfilerStore subscribes to bridge
- Agent subscribes to bridge
- Bridge emits shutdown event
- Agent remove all listeners here
- Would ProfileStore get the shutdown event?
We found that the current impl does account for this (removing all listeners won't prevent existing listeners from getting the currently-processed event):
We should prob still be a good neighbour and only unsubscribe our own listeners tho
This was referenced Oct 9, 2024
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Oct 15, 2024
Changes in this release: * Fix React Compiler badging ([poteto](https://github.com/poteto) in [#31196](#31196)) * fix[react-devtools]: fixed timeline profiler tests ([hoxyq](https://github.com/hoxyq) in [#31261](#31261)) * fix[react-devtools]: record timeline data only when supported ([hoxyq](https://github.com/hoxyq) in [#31154](#31154)) * refactor[react-devtools]: flatten reload and profile config ([hoxyq](https://github.com/hoxyq) in [#31132](#31132)) * fix[react-devtools]: remove all listeners when Agent is shutdown ([hoxyq](https://github.com/hoxyq) in [#31151](#31151)) * fix[react-devtools]: removed redundant startProfiling call ([hoxyq](https://github.com/hoxyq) in [#31131](#31131)) * refactor[react-devtools/fiber/renderer]: optimize durations resolution ([hoxyq](https://github.com/hoxyq) in [#31118](#31118)) * fix[react-devtools]: update profiling status before receiving response from backend ([hoxyq](https://github.com/hoxyq) in [#31117](#31117)) * fix[react-devtools]: wrap key string in preformatted text html element ([hoxyq](https://github.com/hoxyq) in [#31153](#31153)) * chore[react-devtools]: drop legacy context tests ([hoxyq](https://github.com/hoxyq) in [#31059](#31059)) * chore[react-devtools]: add legacy mode error message to the ignore list for tests ([hoxyq](https://github.com/hoxyq) in [#31060](#31060)) * fix[react-devtools]: request hook initialization inside http server response ([hoxyq](https://github.com/hoxyq) in [#31102](#31102)) * [Flight] Serialize Server Components Props in DEV ([sebmarkbage](https://github.com/sebmarkbage) in [#31105](#31105)) * Add: reload to profile for Fusebox ([EdmondChuiHW](https://github.com/EdmondChuiHW) in [#31021](#31021)) * refactor: allow custom impl of backend realod-to-profile support check ([EdmondChuiHW](https://github.com/EdmondChuiHW) in [#31048](#31048)) * fix: use public instance in Fiber renderer and expose it from getInspectorDataForViewAtPoint ([hoxyq](https://github.com/hoxyq) in [#31068](#31068))
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Based on #31049, credits to @EdmondChuiHW.
What is happening here:
backendManager.jscontent script can get injected multiple times by the browser. When Frontend is initializing, it will create Store first, and then execute a content script for bootstraping backend manager. If Frontend was destroyed somewhere between these 2 steps, Backend won't be notified, because it is not initialized yet, so it will not unsubscribe listeners correctly. We might end up duplicating listeners, and the next time Frontend is launched, it will report an issues "Cannot add / remove node ...", because same operations are emitted twice.To reproduce 3 you can do the following: