astro/packages/markdown/remark/src/load-plugins.ts

import * as unified from 'unified';
import type { Plugin, UnifiedPluginImport } from './types';

async function importPlugin(p: string | UnifiedPluginImport): UnifiedPluginImport {
	if (typeof p === 'string') {
		return await import(p);
	}

	return await p;
}

export function loadPlugins(items: Plugin[]): Promise<[unified.Plugin] | [unified.Plugin, any]>[] {
	return items.map((p) => {
		return new Promise((resolve, reject) => {
			if (Array.isArray(p)) {
				const [plugin, opts] = p;
				return importPlugin(plugin)
					.then((m) => resolve([m.default, opts]))
					.catch((e) => reject(e));
			}

			return importPlugin(p)
				.then((m) => resolve([m.default]))
				.catch((e) => reject(e));
		});
	});
}