726966fdc0
Summary: My benchmarks have shown react-emotion to be faster than the current implementation of `styled`. For this reason, I am converting all styling to [emotion](https://emotion.sh). Benchmark results: {F136839093} The syntax is very similar between the two libraries. The main difference is that emotion only allows a single function for the whole style attribute, whereas the old implementation had functions for every style-attirbute. Before: ``` { color: props => props.color, fontSize: props => props.size, } ``` After: ``` props => ({ color: props.color, fontSize: props.size, }) ``` Reviewed By: jknoxville Differential Revision: D9479893 fbshipit-source-id: 2c39e4618f7e52ceacb67bbec8ae26114025723f
58 lines
1.3 KiB
JavaScript
58 lines
1.3 KiB
JavaScript
/**
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* Copyright 2018-present Facebook.
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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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* @format
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*/
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import styled from '../styled/index.js';
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const LargeHeading = styled('div')({
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fontSize: 18,
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fontWeight: 'bold',
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lineHeight: '20px',
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borderBottom: '1px solid #ddd',
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marginBottom: 10,
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});
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const SmallHeading = styled('div')({
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fontSize: 12,
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color: '#90949c',
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fontWeight: 'bold',
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marginBottom: 10,
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textTransform: 'uppercase',
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});
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/**
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* A heading component.
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*
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* @example Heading 1
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* <Heading level={1}>I'm a heading</Heading>
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* @example Heading 2
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* <Heading level={2}>I'm a heading</Heading>
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* @example Heading 3
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* <Heading level={3}>I'm a heading</Heading>
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* @example Heading 4
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* <Heading level={4}>I'm a heading</Heading>
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* @example Heading 5
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* <Heading level={5}>I'm a heading</Heading>
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* @example Heading 6
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* <Heading level={6}>I'm a heading</Heading>
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*/
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export default function Heading(props: {
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/**
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* Level of the heading. A number from 1-6. Where 1 is the largest heading.
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*/
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level?: number,
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/**
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* Children.
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*/
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children?: React$Node,
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}) {
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if (props.level === 1) {
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return <LargeHeading>{props.children}</LargeHeading>;
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} else {
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return <SmallHeading>{props.children}</SmallHeading>;
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}
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}
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