postcss-merge-rules

type AutoprefixerOptions = {
    overrideBrowserslist?: string | string[];
};

type BrowserslistOptions = Pick<browserslist.Options, 'stats' | 'path' | 'env'>;

type Options = AutoprefixerOptions & BrowserslistOptions;

type RuleMeta = {
    /**
     * - Array of selector strings for the rule
     */
    selectors: string[];
    /**
     * - Array of declaration nodes for the rule
     */
    declarations: Declaration[];
    /**
     * - Whether the selectors have been modified and need flushing
     */
    dirty: boolean;
};