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feat: Using CSS data urls for bundling #513

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feat: Using CSS data urls for bundling #513

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18 changes: 18 additions & 0 deletions packages/babel-plugin/src/utils/css-serialize.js
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Original file line number Diff line number Diff line change
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow strict
*/

type Rule = [string, { ltr: string, rtl?: string | null }, number];

export function ruleToCSSDataURI([_, { ltr, rtl }, priority]: Rule): string {
const ltrLayer = `@layer __stylex__ltr { ${ltr} }`;
const rtlLayer = rtl != null ? `@layer __stylex__rtl { ${rtl} }` : '';
const css = `@layer __stylex__${priority} { ${ltrLayer} ${rtlLayer} }`;

return `data:text/css;charset=utf-8,${encodeURIComponent(css)}`;
}