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Support System Color Scheme Preference #27

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Support System Color Scheme Preference #27

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22 changes: 20 additions & 2 deletions scripts/build-css-modules.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,13 +5,31 @@ const allColorScales = require('../index');
const outputDir = require('../tsconfig.json').compilerOptions.outDir;

Object.entries(allColorScales).forEach(([colorScaleName, scale]) => {
const selector = /DarkA?$/.test(colorScaleName) ? '.dark-theme' : ':root';
const isDark = /DarkA?$/.test(colorScaleName);
const selector = isDark
? '[data-theme="dark"]'
: '[data-theme="light"], :root:not([data-theme="dark"])';
const classSelector = isDark ? '.dark-theme' : ':root';
const scaleAssCssProperties = Object.entries(scale)
.map(([name, value]) => ` --${name}: ${value};`)
.join('\n');
const scaleAsCssFile = `${selector} {\n${scaleAssCssProperties}\n}`;
let scaleAsCssFile = `${selector} {\n${scaleAssCssProperties}\n}`;
const classyScaleAsCssFile = `${classSelector} {\n${scaleAssCssProperties}\n}`;

if (isDark) {
const indented = scaleAssCssProperties
.split('\n')
.map((prop) => ` ${prop}`)
.join('\n');
scaleAsCssFile += `\n\n@media only screen and (prefers-color-scheme: dark) {\n :root:not([data-theme="light"]) {\n${indented}\n }\n}`;
}

fs.writeFileSync(
path.join(outputDir, colorScaleName + '.css'),
classyScaleAsCssFile
);
fs.writeFileSync(
path.join(outputDir, colorScaleName + '.classless.css'),
scaleAsCssFile
);
});