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[Fizz] Expose a method to explicitly start writing to a Node stream #21028

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merged 2 commits into from Mar 18, 2021

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@sebmarkbage sebmarkbage commented Mar 18, 2021

We use writable Node streams because it's the only one that lets us explicitly flush to the underlying sink. Especially when used with gzip.

However, we don't want to start writing to it until after the header has been received and perhaps part of the initial content like <head> has been written.

This PR makes it so that you have to explicitly call "startWriting" to start flushing to a Node stream. We'll later expose some various callbacks for when it might be a good idea to start.

For Browser streams, we don't need this API because we use readable streams there. There's no writable streams and the gzip problem doesn't have a solution there. For readable streams you can just wait to provide that stream to the sink until you're ready.

@facebook-github-bot facebook-github-bot added React Core Team Opened by a member of the React Core Team CLA Signed labels Mar 18, 2021
@sebmarkbage sebmarkbage changed the title [Fizz] Expose a method to explicitly start a Node stream [Fizz] Expose a method to explicitly start writing to a Node stream Mar 18, 2021
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sizebot commented Mar 18, 2021

Comparing: cf485e6...3036225

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name +/- Base Current +/- gzip Base gzip Current gzip
oss-stable/react-dom/cjs/react-dom.production.min.js = 122.89 kB 122.89 kB = 39.55 kB 39.55 kB
oss-experimental/react-dom/cjs/react-dom.production.min.js = 129.38 kB 129.38 kB = 41.61 kB 41.61 kB
facebook-www/ReactDOM-prod.classic.js = 409.01 kB 409.01 kB = 75.85 kB 75.85 kB
facebook-www/ReactDOM-prod.modern.js = 397.27 kB 397.27 kB = 73.91 kB 73.91 kB
facebook-www/ReactDOMForked-prod.classic.js = 409.02 kB 409.02 kB = 75.85 kB 75.85 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show
Name +/- Base Current +/- gzip Base gzip Current gzip
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-server.development.js +0.80% 5.13 kB 5.17 kB +0.68% 1.47 kB 1.48 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-server.development.js +0.80% 5.13 kB 5.17 kB +0.68% 1.47 kB 1.48 kB
oss-experimental/react-noop-renderer/cjs/react-noop-renderer-server.production.min.js +0.73% 2.48 kB 2.50 kB +0.93% 0.97 kB 0.98 kB
oss-stable/react-noop-renderer/cjs/react-noop-renderer-server.production.min.js +0.73% 2.48 kB 2.50 kB +0.93% 0.97 kB 0.98 kB
oss-experimental/react-dom/cjs/react-dom-unstable-fizz.node.production.min.js +0.59% 10.52 kB 10.58 kB +0.41% 3.90 kB 3.92 kB
oss-experimental/react-dom/umd/react-dom-unstable-fizz.browser.development.js = 49.61 kB 49.47 kB = 12.13 kB 12.08 kB
oss-experimental/react-dom/cjs/react-dom-unstable-fizz.browser.development.js = 47.11 kB 46.98 kB = 11.97 kB 11.91 kB
oss-experimental/react-server/cjs/react-server.development.js = 32.52 kB 32.38 kB = 8.39 kB 8.33 kB
oss-stable/react-server/cjs/react-server.development.js = 32.52 kB 32.38 kB = 8.39 kB 8.33 kB

Generated by 🚫 dangerJS against 3036225

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Do you want to write a test that does not immediately start writing?

@sebmarkbage sebmarkbage merged commit 154b852 into facebook:master Mar 18, 2021
zhengjitf pushed a commit to zhengjitf/react that referenced this pull request Mar 23, 2021
…acebook#21028)

* Expose an explicit point when to start writing in the Node API

* Add a previously failing test
facebook-github-bot pushed a commit to facebook/react-native that referenced this pull request Mar 23, 2021
Summary:
This sync includes the following changes:
- **[6d3ecb70d](facebook/react@6d3ecb70d )**: Remove unstable_changedBits ([#20953](facebook/react#20953)) //<Andrew Clark>//
- **[754e30728](facebook/react@754e30728 )**: Delete immediateQueueCallbackNode ([#20980](facebook/react#20980)) //<Andrew Clark>//
- **[be5a2e231](facebook/react@be5a2e231 )**: Land enableSyncMicrotasks ([#20979](facebook/react#20979)) //<Andrew Clark>//
- **[f6bc9c824](facebook/react@f6bc9c824 )**: [Fizz] Expose maxBoundarySize as an option ([#21029](facebook/react#21029)) //<Sebastian Markbåge>//
- **[154b85213](facebook/react@154b85213 )**: [Fizz] Expose a method to explicitly start writing to a Node stream ([#21028](facebook/react#21028)) //<Sebastian Markbåge>//
- **[cf485e6f6](facebook/react@cf485e6f6 )**: [Fizz] Expose a method to abort a pending request ([#21027](facebook/react#21027)) //<Sebastian Markbåge>//
- **[3fb11eed9](facebook/react@3fb11eed9 )**: React Native: Touch Instrumentation Interface ([#21024](facebook/react#21024)) //<Timothy Yung>//
- **[825c3021f](facebook/react@825c3021f )**: Don't delete trailing mismatches during hydration at the root ([#21021](facebook/react#21021)) //<Sebastian Markbåge>//
- **[1d1e49cfa](facebook/react@1d1e49cfa )**: [Fizz] Assign an ID to the first DOM element in a fallback or insert a dummy (and testing infra) ([#21020](facebook/react#21020)) //<Sebastian Markbåge>//
- **[466b26c92](facebook/react@466b26c92 )**: Store commit durations on HostRoot for DevTools access ([#20983](facebook/react#20983)) //<Brian Vaughn>//
- **[89acfa639](facebook/react@89acfa639 )**: Fix native event batching in concurrent mode ([#21010](facebook/react#21010)) //<Ricky>//
- **[0203b6567](facebook/react@0203b6567 )**: chore: update react-reconciler README ([#21016](facebook/react#21016)) //<susiwen8>//

Changelog:
[General][Changed] - React Native sync for revisions c9f6d0a...6d3ecb7

jest_e2e[run_all_tests]

Reviewed By: JoshuaGross, kacieb

Differential Revision: D27231625

fbshipit-source-id: 89c0c0662e69044ae8890486a693013bee6005dd
koto pushed a commit to koto/react that referenced this pull request Jun 15, 2021
…acebook#21028)

* Expose an explicit point when to start writing in the Node API

* Add a previously failing test
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