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https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Sebastian MarkbågeandSophie Alpert
c15579631f
This is a follow up to https://github.com/facebook/react/pull/26546 This is strictly a perf optimization since we know that switches over strings aren't optimally implemented in current engines. Basically they're a sequence of ifs. As a result, we're better off putting the unusual cases in a Map and the very common cases in the beginning of the switch. We might be better off putting very common cases in explicit ifs - just in case the engine does optimize switches to a hash table which is potentially worse. --------- Co-authored-by: Sophie Alpert <git@sophiebits.com>
89 lines
1.8 KiB
JavaScript
89 lines
1.8 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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/**
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* CSS properties which accept numbers but are not in units of "px".
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*/
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const unitlessNumbers = new Set([
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'animationIterationCount',
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'aspectRatio',
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'borderImageOutset',
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'borderImageSlice',
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'borderImageWidth',
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'boxFlex',
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'boxFlexGroup',
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'boxOrdinalGroup',
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'columnCount',
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'columns',
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'flex',
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'flexGrow',
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'flexPositive',
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'flexShrink',
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'flexNegative',
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'flexOrder',
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'gridArea',
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'gridRow',
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'gridRowEnd',
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'gridRowSpan',
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'gridRowStart',
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'gridColumn',
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'gridColumnEnd',
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'gridColumnSpan',
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'gridColumnStart',
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'fontWeight',
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'lineClamp',
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'lineHeight',
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'opacity',
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'order',
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'orphans',
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'scale',
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'tabSize',
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'widows',
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'zIndex',
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'zoom',
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'fillOpacity', // SVG-related properties
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'floodOpacity',
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'stopOpacity',
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'strokeDasharray',
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'strokeDashoffset',
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'strokeMiterlimit',
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'strokeOpacity',
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'strokeWidth',
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'MozAnimationIterationCount', // Known Prefixed Properties
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'MozBoxFlex', // TODO: Remove these since they shouldn't be used in modern code
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'MozBoxFlexGroup',
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'MozLineClamp',
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'msAnimationIterationCount',
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'msFlex',
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'msZoom',
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'msFlexGrow',
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'msFlexNegative',
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'msFlexOrder',
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'msFlexPositive',
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'msFlexShrink',
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'msGridColumn',
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'msGridColumnSpan',
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'msGridRow',
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'msGridRowSpan',
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'WebkitAnimationIterationCount',
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'WebkitBoxFlex',
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'WebKitBoxFlexGroup',
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'WebkitBoxOrdinalGroup',
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'WebkitColumnCount',
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'WebkitColumns',
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'WebkitFlex',
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'WebkitFlexGrow',
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'WebkitFlexPositive',
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'WebkitFlexShrink',
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'WebkitLineClamp',
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]);
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export default function (name: string): boolean {
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return unitlessNumbers.has(name);
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}
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