stringifyTheme.js
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/* eslint-disable import/prefer-default-export */
import { isPlainObject } from '@mui/utils/deepmerge';
function isSerializable(val) {
return isPlainObject(val) || typeof val === 'undefined' || typeof val === 'string' || typeof val === 'boolean' || typeof val === 'number' || Array.isArray(val);
}
/**
* `baseTheme` usually comes from `createTheme()` or `extendTheme()`.
*
* This function is intended to be used with zero-runtime CSS-in-JS like Pigment CSS
* For example, in a Next.js project:
*
* ```js
* // next.config.js
* const { extendTheme } = require('@mui/material/styles');
*
* const theme = extendTheme();
* // `.toRuntimeSource` is Pigment CSS specific to create a theme that is available at runtime.
* theme.toRuntimeSource = stringifyTheme;
*
* module.exports = withPigment({
* theme,
* });
* ```
*/
export function stringifyTheme(baseTheme = {}) {
const serializableTheme = {
...baseTheme
};
function serializeTheme(object) {
const array = Object.entries(object);
// eslint-disable-next-line no-plusplus
for (let index = 0; index < array.length; index++) {
const [key, value] = array[index];
if (!isSerializable(value) || key.startsWith('unstable_')) {
delete object[key];
} else if (isPlainObject(value)) {
object[key] = {
...value
};
serializeTheme(object[key]);
}
}
}
serializeTheme(serializableTheme);
return `import { unstable_createBreakpoints as createBreakpoints, createTransitions } from '@mui/material/styles';
const theme = ${JSON.stringify(serializableTheme, null, 2)};
theme.breakpoints = createBreakpoints(theme.breakpoints || {});
theme.transitions = createTransitions(theme.transitions || {});
export default theme;`;
}