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Add support for React.pure in ReactDOMServer #13855

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merged 2 commits into from Oct 20, 2018

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alexmckenley
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Add support for REACT_PURE_TYPE in ReactDOMServer + tests

@@ -0,0 +1,112 @@
/**
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There's a lot of setup cost for initializing these test modules. Can we put this together with some other tests since there's only a few of test cases here?

@@ -945,7 +946,8 @@ class ReactDOMServerRenderer {
}
if (typeof elementType === 'object' && elementType !== null) {
switch (elementType.$$typeof) {
case REACT_FORWARD_REF_TYPE: {
case REACT_FORWARD_REF_TYPE:
case REACT_PURE_TYPE: {
const element: ReactElement = ((nextChild: any): ReactElement);
const nextChildren = toArray(
elementType.render(element.props, element.ref),
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This is not correct. It is passing the element.ref second argument. It shouldn't get the second argument in the pure case.

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But #13822?

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I didn't see that one. I'm not sure I approve. Let me think about it.

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@sebmarkbage sebmarkbage left a comment

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It would be better to copy/paste the branch so that you can specialize it for the pure use case. In this case, avoid passing the second argument.

@sizebot
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sizebot commented Oct 15, 2018

Details of bundled changes.

Comparing: 15b11d2...28f5c3b

react-dom

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-dom-server.browser.development.js +0.6% +0.3% 107.63 KB 108.24 KB 28.54 KB 28.61 KB UMD_DEV
react-dom-server.browser.production.min.js 🔺+1.0% 🔺+0.5% 15.75 KB 15.91 KB 6.02 KB 6.05 KB UMD_PROD
react-dom-server.browser.development.js +0.6% +0.3% 103.76 KB 104.37 KB 27.54 KB 27.63 KB NODE_DEV
react-dom-server.browser.production.min.js 🔺+1.0% 🔺+0.5% 15.65 KB 15.8 KB 6.01 KB 6.04 KB NODE_PROD
react-dom-server.node.development.js +0.6% +0.3% 105.68 KB 106.29 KB 28.1 KB 28.18 KB NODE_DEV
react-dom-server.node.production.min.js 🔺+0.9% 🔺+0.5% 16.46 KB 16.61 KB 6.31 KB 6.34 KB NODE_PROD
ReactDOMServer-dev.js +0.6% +0.3% 103.29 KB 103.93 KB 26.83 KB 26.92 KB FB_WWW_DEV
ReactDOMServer-prod.js 🔺+1.5% 🔺+0.6% 34.48 KB 35 KB 8.3 KB 8.36 KB FB_WWW_PROD

scheduler

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
scheduler.development.js n/a n/a 0 B 19.17 KB 0 B 5.74 KB UMD_DEV
scheduler.production.min.js n/a n/a 0 B 3.16 KB 0 B 1.53 KB UMD_PROD

Generated by 🚫 dangerJS

@alexmckenley
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Moved the tests and branched the REACT_PURE_TYPE logic. I'm still passing the forward ref stuff for now to keep the behavior in sync with ReactDOM (#13855). Let me know if you want to change this behavior.

@gaearon
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gaearon commented Oct 16, 2018

Yeah we're going to revert that and change so that:

  • pure gets one argument
  • It should be possible to render pure(forwardRef()) (but not the other way around)

@acdlite has details

@alexmckenley
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Updated my diff so pure works with both functions and forwardRef elements. The tests should pass once pure and react Fiber are updated to respect this new logic.

@sebmarkbage
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I updated on top of #13903. This now uses a slow path to implement pure in a fully recursive form. This is unfortunate but that's the easiest given the structure of the partial renderer. It doesn't make it easy to make recursive custom types.

But we're rewriting this whole engine soon anyway.

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7 participants