不支持内部继续 require

importmap.json

{
    "axios": "https://cdn.jsdelivr.net/npm/axios/dist/axios.js",
    "node-fetch": "https://cdn.jsdelivr.net/npm/node-fetch/lib/index.js",
    "markdown-it": "https://cdn.jsdelivr.net/npm/markdown-it/dist/markdown-it.js",
    "remarkable": "https://cdn.jsdelivr.net/npm/remarkable/dist/remarkable.js"
}

require-from-url.js

// see npm: require-from-url
// compile('module.exports = 42', '.') => 42
const path = require('path');
function compile(code, filename) {
    const Module = module.constructor;
    const m = new Module(filename, module.parent);
    m.filename = filename;
    m.paths = Module._nodeModulePaths(path.dirname(filename));
    m._compile(code, filename);
    return m.exports;
}
const https = require('https');
function gets(url) {
    return new Promise((resolve, reject) => {
        // prettier-ignore
        https.get(url, res => {
            const buf = [];
            res.on('data', data => {
                buf.push(data);
            }).on('end', () => {
                resolve(Buffer.concat(buf).toString());
            });
        }).on('error', reject);
    });
}
const importmap = require('./importmap.json');
async function requireFromUrl(url) {
    if (url in importmap) url = importmap[url];
    const code = await gets(url);
    return compile(code, url);
}

async function testAxios() {
    const axios = await requireFromUrl('axios');
    console.log(axios);
}

async function testNodeFetch() {
    const fetch = await requireFromUrl('node-fetch');
    console.log(fetch);
}

async function testMarkdownIt() {
    const MarkdownIt = await requireFromUrl('markdown-it');
    console.log(MarkdownIt);
}

async function testRemarkable() {
    const { Remarkable } = await requireFromUrl('remarkable');
    console.log(Remarkable);
}

async function runTests() {
    await Promise.all([
        testAxios(),
        testNodeFetch(),
        testMarkdownIt(),
        testRemarkable(),
    ]);
}

async function main() {
    try {
        await runTests();
    } catch (e) {
        console.log(e.message);
    }
}

main();