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39 lines
1.4 KiB
TypeScript
39 lines
1.4 KiB
TypeScript
/**
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* This is a rather contrived test. The trick is to construct a scenario where
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* Math.random is called during the create-component-tree phase but not during the render.
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* To do this we patch Symbol.for. When the `react.client.reference` symbol is checked
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* we know that this is happening in the create-component-tree function. Given the simple
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* setup of the test page this symbol is not checked during the actual prerender itself.
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*
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* This test may flake in the future. It should be replaced ideally with a test that uses
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* our OTel implementation to ensure that the built-in trace in create-component-tree does not
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* early abort the prerender. The problem is that we are about to make these functions avoid the
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* workUnitStore scope so it will not express the regression for other reasons.
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*/
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function patchSymbolFor() {
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const isPatched = globalThis[Symbol.for('__SYMBOL_FOR_PATCHED__')]
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if (!isPatched) {
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console.log('patching')
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globalThis[Symbol.for('__SYMBOL_FOR_PATCHED__')] = true
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const originalSymbolFor = Symbol.for
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Symbol.for = (...args) => {
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if (args[0] === 'react.client.reference') {
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Math.random()
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}
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return originalSymbolFor.apply(Symbol, args)
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}
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}
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}
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patchSymbolFor()
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export default function Root({ children }: { children: React.ReactNode }) {
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return (
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<html>
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<body>{children}</body>
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</html>
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)
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}
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