@aplus-frontend/antdv/es/_util/cssinjs/theme/Theme.js

Vue basic component library maintained based on ant-design-vue

import warning from '../../warning';
let uuid = 0;
/**
 * Theme with algorithms to derive tokens from design tokens.
 * Use `createTheme` first which will help to manage the theme instance cache.
 */
export default class Theme {
  constructor(derivatives) {
    this.derivatives = Array.isArray(derivatives) ? derivatives : [derivatives];
    this.id = uuid;
    if (derivatives.length === 0) {
      warning(derivatives.length > 0, '[Ant Design Vue CSS-in-JS] Theme should have at least one derivative function.');
    }
    uuid += 1;
  }
  getDerivativeToken(token) {
    return this.derivatives.reduce((result, derivative) => derivative(token, result), undefined);
  }
}