Support for async loading in Remix/Esbuild #2546
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1. React no longer recommends this pattern and has removed the warning about "set state after unmounted may indicate a memory leak" because the intention was to help developers find places to cancel asynchronous actions but many can't be cancelled so this just leads to noise in the code. 2. This led to race conditions where a load() call is made while mounted is still false and the loaded result is never set in the value. The callback is never invoked a second time, so the value never gets set despite the load completing.
1. React no longer recommends this pattern and has removed the warning about "set state after unmounted may indicate a memory leak" because the intention was to help developers find places to cancel asynchronous actions but many can't be cancelled so this just leads to noise in the code. 2. This led to race conditions where a load() call is made while mounted is still false and the loaded result is never set in the value. The callback is never invoked a second time, so the value never gets set despite the load completing.
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/snapit |
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🫰✨ Thanks @ryanwilsonperkin! Your snapshots have been published to npm. Test the snapshots by updating your yarn add @shopify/browser@0.0.0-snapshot-20230203161211yarn add @shopify/react-async@0.0.0-snapshot-20230203161211yarn add @shopify/react-graphql@0.0.0-snapshot-20230203161211yarn add @shopify/react-graphql-universal-provider@0.0.0-snapshot-20230203161211yarn add @shopify/react-i18n@0.0.0-snapshot-20230203161211yarn add @shopify/react-i18n-universal-provider@0.0.0-snapshot-20230203161211yarn add @shopify/react-server@0.0.0-snapshot-20230203161211yarn add @shopify/react-testing@0.0.0-snapshot-20230203161211 |
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Description
Works together with #2538
When attempting to lazy load React components and GraphQL documents using Remix/Esbuild, we've found that the
loadcallback from the async resolver will often be fired while theuseMountedRefis returning false. This might indicate an edge case inuseMountedRef, potentially because of the use of ESM in the browser, or rendering under Strict Mode.This meant that the callback would be triggered and would resolve the async value, but because the mounted ref was set to false, we would not call the setState and so would never show the loaded value. By removing the mounted check, we get the value setting correctly.
We also believe that this is the right path forward regardless of this loading bug, because of a change introduced in React 18 to no longer warn in this scenario. Setting state when the component was unmounted would previously emit a warning, with the intent to get developers to cancel their async actions as a cleanup state when unmounting a component. Unfortunately, many async actions don't have an easy option for cancelling so it led many devs to create variants of
isMounted