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Feature Flag for React.jsx' "spreading a key to jsx" warning #18074

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@threepointone threepointone commented Feb 19, 2020

Adds a feature flag for when React.jsx warns you about spreading a key into jsx. It's false for all builds, except as a dynamic flag for fb/www.

I also included the component name in the warning.

@facebook-github-bot facebook-github-bot added the React Core Team Opened by a member of the React Core Team label Feb 19, 2020
@threepointone threepointone changed the title Feature Flag for React.jsx` "spreading a key to jsx" warning Feature Flag for React.jsx' "spreading a key to jsx" warning Feb 19, 2020
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sizebot commented Feb 19, 2020

Details of bundled changes.

Comparing: 4912ba3...96c85c6

react

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react.development.js +0.4% +0.6% 115.28 KB 115.78 KB 29.56 KB 29.74 KB UMD_DEV
react.production.min.js 0.0% 0.0% 12.67 KB 12.67 KB 4.95 KB 4.95 KB UMD_PROD
react.profiling.min.js 0.0% 0.0% 16.2 KB 16.2 KB 6.05 KB 6.05 KB UMD_PROFILING
react.development.js +0.7% +0.9% 74.79 KB 75.29 KB 19.85 KB 20.03 KB NODE_DEV
react.production.min.js 0.0% 0.0% 6.96 KB 6.96 KB 2.86 KB 2.86 KB NODE_PROD
React-dev.js +0.2% +0.2% 74.39 KB 74.55 KB 18.89 KB 18.93 KB FB_WWW_DEV
React-prod.js 0.0% 0.0% 18.28 KB 18.28 KB 4.68 KB 4.68 KB FB_WWW_PROD
React-profiling.js 0.0% 0.0% 18.28 KB 18.28 KB 4.68 KB 4.68 KB FB_WWW_PROFILING

react-dom

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-dom.profiling.min.js 0.0% 0.0% 123.72 KB 123.72 KB 38.72 KB 38.72 KB NODE_PROFILING
react-dom-unstable-fizz.browser.development.js 0.0% +0.1% 3.88 KB 3.88 KB 1.55 KB 1.55 KB UMD_DEV
ReactDOM-dev.js 0.0% 0.0% 989.64 KB 989.71 KB 218.22 KB 218.24 KB FB_WWW_DEV
react-dom-test-utils.development.js +0.7% +0.9% 55.98 KB 56.36 KB 15.78 KB 15.93 KB UMD_DEV
react-dom-server.browser.development.js +0.3% +0.4% 139.77 KB 140.16 KB 37.11 KB 37.25 KB UMD_DEV
react-dom-test-utils.production.min.js 0.0% 0.0% 11.21 KB 11.21 KB 4.16 KB 4.17 KB UMD_PROD
react-dom-test-utils.development.js +0.7% +1.0% 54.25 KB 54.64 KB 15.47 KB 15.61 KB NODE_DEV
react-dom-server.browser.development.js +0.3% +0.4% 135.71 KB 136.09 KB 36.09 KB 36.23 KB NODE_DEV
react-dom-test-utils.production.min.js 0.0% 0.0% 10.99 KB 10.99 KB 4.1 KB 4.1 KB NODE_PROD
react-dom-server.browser.production.min.js 0.0% 0.0% 20.39 KB 20.39 KB 7.47 KB 7.47 KB NODE_PROD
react-dom.development.js 0.0% +0.1% 969.61 KB 970 KB 217.85 KB 218.01 KB UMD_DEV
react-dom-unstable-native-dependencies.development.js 0.0% 0.0% 58.73 KB 58.73 KB 15.36 KB 15.36 KB UMD_DEV
react-dom.production.min.js 0.0% 0.0% 119.87 KB 119.87 KB 38.33 KB 38.33 KB UMD_PROD
ReactTestUtils-dev.js +0.1% +0.2% 52.86 KB 52.93 KB 14.39 KB 14.41 KB FB_WWW_DEV
react-dom-unstable-native-dependencies.production.min.js 0.0% 0.0% 10.25 KB 10.25 KB 3.47 KB 3.48 KB UMD_PROD
ReactDOMServer-dev.js 0.0% +0.1% 140.47 KB 140.54 KB 35.55 KB 35.57 KB FB_WWW_DEV
react-dom.profiling.min.js 0.0% 0.0% 123.5 KB 123.5 KB 39.5 KB 39.5 KB UMD_PROFILING
ReactDOMServer-prod.js 0.0% 0.0% 48.27 KB 48.27 KB 11.02 KB 11.02 KB FB_WWW_PROD
react-dom.development.js 0.0% +0.1% 963.69 KB 964.08 KB 216.22 KB 216.38 KB NODE_DEV
react-dom-unstable-native-dependencies.development.js 0.0% 0.0% 58.43 KB 58.43 KB 15.28 KB 15.28 KB NODE_DEV
react-dom.production.min.js 0.0% 0.0% 119.93 KB 119.93 KB 37.57 KB 37.57 KB NODE_PROD
react-dom-unstable-native-dependencies.production.min.js 0.0% 🔺+0.1% 9.99 KB 9.99 KB 3.38 KB 3.38 KB NODE_PROD
react-dom-unstable-fizz.node.production.min.js 0.0% 🔺+0.1% 1.21 KB 1.21 KB 697 B 698 B NODE_PROD
ReactDOM-prod.js 0.0% 0.0% 372.98 KB 372.98 KB 67.77 KB 67.77 KB FB_WWW_PROD
ReactDOM-profiling.js 0.0% 0.0% 384.28 KB 384.28 KB 69.84 KB 69.84 KB FB_WWW_PROFILING
react-dom-unstable-fizz.browser.development.js 0.0% +0.1% 3.71 KB 3.71 KB 1.5 KB 1.5 KB NODE_DEV
react-dom-testing.development.js 0.0% 0.0% 966.45 KB 966.45 KB 216.69 KB 216.69 KB UMD_DEV
react-dom-testing.production.min.js 0.0% 0.0% 117.52 KB 117.52 KB 37.86 KB 37.86 KB UMD_PROD
ReactDOMTesting-dev.js 0.0% 0.0% 989.14 KB 989.15 KB 218.09 KB 218.1 KB FB_WWW_DEV
react-dom-testing.profiling.min.js 0.0% 0.0% 121.04 KB 121.04 KB 39.01 KB 39.01 KB UMD_PROFILING
react-dom-testing.development.js 0.0% 0.0% 960.53 KB 960.53 KB 215.05 KB 215.05 KB NODE_DEV
react-dom-server.node.development.js +0.3% +0.4% 136.82 KB 137.2 KB 36.32 KB 36.46 KB NODE_DEV
react-dom-server.node.production.min.js 0.0% 0.0% 20.79 KB 20.79 KB 7.62 KB 7.62 KB NODE_PROD

react-reconciler

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-reconciler-persistent.development.js 0.0% 0.0% 615.41 KB 615.41 KB 128.53 KB 128.53 KB NODE_DEV
react-reconciler-reflection.development.js +1.9% +2.3% 20.54 KB 20.92 KB 6.76 KB 6.92 KB NODE_DEV
react-reconciler-persistent.production.min.js 0.0% 0.0% 73.76 KB 73.76 KB 21.78 KB 21.79 KB NODE_PROD
react-reconciler.development.js +0.1% +0.1% 619.21 KB 619.6 KB 130.04 KB 130.2 KB NODE_DEV
react-reconciler.production.min.js 0.0% 0.0% 76.52 KB 76.52 KB 22.44 KB 22.44 KB NODE_PROD

scheduler

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
scheduler-tracing.development.js +3.1% +5.0% 12.57 KB 12.95 KB 3.29 KB 3.46 KB NODE_DEV
scheduler-tracing.production.min.js 0.0% 🔺+1.0% 741 B 741 B 391 B 395 B NODE_PROD
scheduler-unstable_mock.development.js 0.0% 0.0% 22.66 KB 22.66 KB 5.41 KB 5.41 KB UMD_DEV
scheduler-tracing.profiling.min.js 0.0% +0.2% 3.26 KB 3.26 KB 1000 B 1002 B NODE_PROFILING
scheduler-unstable_mock.production.min.js 0.0% 0.0% 4.72 KB 4.72 KB 1.98 KB 1.98 KB UMD_PROD
SchedulerTracing-dev.js +0.7% +1.0% 10.13 KB 10.2 KB 2.19 KB 2.21 KB FB_WWW_DEV
scheduler-unstable_mock.development.js 0.0% 0.0% 22.47 KB 22.47 KB 5.35 KB 5.35 KB NODE_DEV
scheduler-unstable_mock.production.min.js 0.0% 🔺+0.1% 4.71 KB 4.71 KB 1.91 KB 1.91 KB NODE_PROD
scheduler.development.js 0.0% 0.0% 25.29 KB 25.29 KB 6.48 KB 6.48 KB NODE_DEV
scheduler.production.min.js 0.0% 0.0% 5 KB 5 KB 2.01 KB 2.01 KB NODE_PROD

react-art

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
ReactART-dev.js 0.0% 0.0% 625.45 KB 625.52 KB 129.19 KB 129.21 KB FB_WWW_DEV
react-art.development.js +0.1% +0.1% 682.43 KB 682.81 KB 146.87 KB 147.02 KB UMD_DEV
react-art.production.min.js 0.0% 0.0% 107.54 KB 107.54 KB 32.52 KB 32.53 KB UMD_PROD
react-art.development.js +0.1% +0.1% 613.1 KB 613.48 KB 129.46 KB 129.62 KB NODE_DEV
react-art.production.min.js 0.0% 0.0% 72.5 KB 72.5 KB 21.66 KB 21.66 KB NODE_PROD
ReactART-prod.js 0.0% 0.0% 233.07 KB 233.07 KB 39.28 KB 39.28 KB FB_WWW_PROD

React: size: 0.0%, gzip: 0.0%

Size changes (experimental)

Generated by 🚫 dangerJS against 96c85c6

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To see build info of the built libraries, click here or the icon next to each commit SHA.

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sizebot commented Feb 19, 2020

Details of bundled changes.

Comparing: 4912ba3...96c85c6

react

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react.development.js +0.4% +0.6% 115.26 KB 115.76 KB 29.56 KB 29.74 KB UMD_DEV
react.production.min.js 0.0% 0.0% 12.33 KB 12.33 KB 4.84 KB 4.84 KB UMD_PROD
react.profiling.min.js 0.0% 0.0% 15.85 KB 15.85 KB 5.95 KB 5.95 KB UMD_PROFILING
react.development.js +0.7% +0.9% 74.77 KB 75.27 KB 19.84 KB 20.02 KB NODE_DEV
react.production.min.js 0.0% 0.0% 6.54 KB 6.54 KB 2.72 KB 2.72 KB NODE_PROD
React-dev.js +0.2% +0.2% 74.38 KB 74.54 KB 18.89 KB 18.93 KB FB_WWW_DEV
React-prod.js 0.0% 0.0% 18.17 KB 18.17 KB 4.69 KB 4.69 KB FB_WWW_PROD
React-profiling.js 0.0% 0.0% 18.17 KB 18.17 KB 4.69 KB 4.69 KB FB_WWW_PROFILING

react-dom

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-dom-testing.production.min.js 0.0% -0.0% 117.07 KB 117.07 KB 37.04 KB 37.03 KB NODE_PROD
react-dom-unstable-native-dependencies.development.js 0.0% 0.0% 58.72 KB 58.72 KB 15.35 KB 15.35 KB UMD_DEV
react-dom-unstable-native-dependencies.production.min.js 0.0% 🔺+0.1% 10.24 KB 10.24 KB 3.47 KB 3.47 KB UMD_PROD
ReactTestUtils-dev.js +0.1% +0.2% 52.86 KB 52.93 KB 14.38 KB 14.41 KB FB_WWW_DEV
react-dom.development.js 0.0% +0.1% 969.59 KB 969.97 KB 217.83 KB 218 KB UMD_DEV
react-dom-server.browser.development.js +0.3% +0.4% 139.75 KB 140.13 KB 37.1 KB 37.25 KB UMD_DEV
react-dom-unstable-fizz.node.production.min.js 0.0% 🔺+0.1% 1.2 KB 1.2 KB 689 B 690 B NODE_PROD
react-dom.production.min.js 0.0% 0.0% 115.96 KB 115.96 KB 37.21 KB 37.21 KB UMD_PROD
ReactDOMTesting-dev.js 0.0% 0.0% 989.14 KB 989.14 KB 218.08 KB 218.08 KB FB_WWW_DEV
react-dom.development.js 0.0% +0.1% 963.67 KB 964.06 KB 216.2 KB 216.37 KB NODE_DEV
ReactDOMTesting-prod.js 0.0% 0.0% 383.18 KB 383.18 KB 69.65 KB 69.65 KB FB_WWW_PROD
react-dom-server.browser.development.js +0.3% +0.4% 135.68 KB 136.07 KB 36.08 KB 36.23 KB NODE_DEV
react-dom.production.min.js 0.0% 0.0% 115.99 KB 115.99 KB 36.55 KB 36.55 KB NODE_PROD
react-dom-testing.development.js 0.0% 0.0% 966.42 KB 966.42 KB 216.68 KB 216.68 KB UMD_DEV
ReactDOMTesting-profiling.js 0.0% 0.0% 383.18 KB 383.18 KB 69.65 KB 69.65 KB FB_WWW_PROFILING
react-dom-unstable-fizz.browser.development.js 0.0% +0.1% 3.87 KB 3.87 KB 1.54 KB 1.54 KB UMD_DEV
react-dom.profiling.min.js 0.0% -0.0% 119.66 KB 119.66 KB 37.64 KB 37.64 KB NODE_PROFILING
ReactDOM-dev.js 0.0% 0.0% 990.59 KB 990.66 KB 218.53 KB 218.56 KB FB_WWW_DEV
ReactDOMServer-dev.js 0.0% 0.0% 140.46 KB 140.53 KB 35.55 KB 35.57 KB FB_WWW_DEV
ReactDOM-prod.js 0.0% 0.0% 396.61 KB 396.61 KB 72.1 KB 72.1 KB FB_WWW_PROD
react-dom-testing.development.js 0.0% 0.0% 960.51 KB 960.51 KB 215.04 KB 215.04 KB NODE_DEV
ReactDOMServer-prod.js 0.0% 0.0% 48.98 KB 48.98 KB 11.17 KB 11.18 KB FB_WWW_PROD
react-dom-unstable-fizz.browser.development.js 0.0% +0.1% 3.7 KB 3.7 KB 1.49 KB 1.5 KB NODE_DEV
react-dom-unstable-native-dependencies.development.js 0.0% 0.0% 58.42 KB 58.42 KB 15.28 KB 15.28 KB NODE_DEV
react-dom-test-utils.development.js +0.7% +0.9% 55.97 KB 56.35 KB 15.78 KB 15.92 KB UMD_DEV
react-dom-unstable-native-dependencies.production.min.js 0.0% 🔺+0.1% 9.98 KB 9.98 KB 3.37 KB 3.37 KB NODE_PROD
react-dom-test-utils.production.min.js 0.0% 0.0% 11.2 KB 11.2 KB 4.16 KB 4.16 KB UMD_PROD
react-dom-test-utils.development.js +0.7% +1.0% 54.24 KB 54.62 KB 15.46 KB 15.61 KB NODE_DEV
react-dom-server.node.development.js +0.3% +0.4% 136.79 KB 137.18 KB 36.31 KB 36.46 KB NODE_DEV
react-dom-test-utils.production.min.js 0.0% 0.0% 10.97 KB 10.97 KB 4.09 KB 4.09 KB NODE_PROD

react-art

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-art.production.min.js 0.0% 0.0% 69.99 KB 69.99 KB 20.99 KB 20.99 KB NODE_PROD
react-art.development.js +0.1% +0.1% 682.4 KB 682.79 KB 146.87 KB 147.01 KB UMD_DEV
react-art.production.min.js 0.0% 0.0% 104.98 KB 104.98 KB 31.84 KB 31.84 KB UMD_PROD
react-art.development.js +0.1% +0.1% 613.08 KB 613.46 KB 129.45 KB 129.61 KB NODE_DEV
ReactART-dev.js 0.0% 0.0% 625.44 KB 625.51 KB 129.18 KB 129.21 KB FB_WWW_DEV
ReactART-prod.js 0.0% 0.0% 240.58 KB 240.58 KB 40.5 KB 40.5 KB FB_WWW_PROD

react-reconciler

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
react-reconciler-persistent.development.js 0.0% 0.0% 615.39 KB 615.39 KB 128.52 KB 128.52 KB NODE_DEV
react-reconciler-persistent.production.min.js 0.0% 0.0% 73.75 KB 73.75 KB 21.78 KB 21.78 KB NODE_PROD
react-reconciler.development.js +0.1% +0.1% 619.2 KB 619.59 KB 130.04 KB 130.2 KB NODE_DEV
react-reconciler-reflection.development.js +1.9% +2.3% 20.52 KB 20.91 KB 6.76 KB 6.91 KB NODE_DEV

scheduler

File Filesize Diff Gzip Diff Prev Size Current Size Prev Gzip Current Gzip ENV
SchedulerTracing-dev.js +0.7% +0.9% 10.13 KB 10.2 KB 2.19 KB 2.21 KB FB_WWW_DEV
scheduler.development.js 0.0% 0.0% 25.28 KB 25.28 KB 6.48 KB 6.48 KB NODE_DEV
scheduler.production.min.js 0.0% 0.0% 4.99 KB 4.99 KB 2 KB 2 KB NODE_PROD
scheduler-unstable_mock.development.js 0.0% 0.0% 22.65 KB 22.65 KB 5.4 KB 5.4 KB UMD_DEV
scheduler-unstable_mock.production.min.js 0.0% 🔺+0.1% 4.71 KB 4.71 KB 1.97 KB 1.97 KB UMD_PROD
scheduler-unstable_mock.development.js 0.0% 0.0% 22.46 KB 22.46 KB 5.35 KB 5.35 KB NODE_DEV
scheduler-tracing.development.js +3.1% +5.1% 12.55 KB 12.94 KB 3.29 KB 3.46 KB NODE_DEV
scheduler-unstable_mock.production.min.js 0.0% 🔺+0.1% 4.7 KB 4.7 KB 1.9 KB 1.9 KB NODE_PROD
scheduler-tracing.profiling.min.js 0.0% +0.2% 3.25 KB 3.25 KB 991 B 993 B NODE_PROFILING

ReactDOM: size: 0.0%, gzip: 🔺+0.1%

React: size: 0.0%, gzip: 0.0%

Size changes (stable)

Generated by 🚫 dangerJS against 96c85c6

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codesandbox-ci bot commented Feb 19, 2020

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

@@ -365,13 +369,20 @@ export function jsxWithValidation(
}
}

if (hasOwnProperty.call(props, 'key')) {
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@threepointone threepointone Feb 19, 2020

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moved this inside the __DEV__ block. It wasn't being DCEed, so that gets us a few bytes back too.

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Wait, wasn’t this whole file supposed to be dev only? Are you saying this function is used in prod?

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Oh hmm you're right. I only glanced at sizebot, probably not relevant.

@threepointone threepointone force-pushed the jsx-spread-warning-feature-flag branch 2 times, most recently from 0643ad6 to 513ed10 Compare February 19, 2020 14:35
Adds a feature flag for when React.jsx warns you about spreading a key into jsx. It's false for all builds, except as a dynamic flag for fb/www.

I also included the component name in the warning.
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