覆盖多个先前的终端输出

我想你需要用 readline.moveCursor 将光标相对于其当前位置移动以返回到与请求相对应的行。这也意味着您需要跟踪当前行或将其移回 x: 0 每次写作后。

const readline = require('readline')

let i = 0;
const next = () => {
    if (i && i%3 === 0) readline.moveCursor(process.stdout, null, -3)
    readline.cursorTo(process.stdout, 0, null);
    readline.clearLine(process.stdout, 0);
    process.stdout.write(`${i}\n`);
    i += 1;
    if (i < 9) setTimeout(next, 200);
    else console.log();
}
setTimeout(next, 200);

对于您的具体示例,我认为您需要更类似于以下内容的内容:

const readline = require('readline');
// ...
urls = [];
const rowOf = url => {
    let row = urls.indexOf(req.url);
    if (row === -1) {
        row = urls.length;
        urls.push(req.url);
    }
    return row;
}

const writeLine = (row, str) => {
    readline.moveCursor(process.stdout, null, row);
    readline.cursorTo(process.stdout, 0, null);
    readline.clearLine(process.stdout, 0);
    process.stdout.write(str);
    readline.moveCursor(process.stdout, null, -1*row);
    readline.cursorTo(process.stdout, 0, null);
}

devServer: {
    proxy: {
        onProxyReq: function (proxyReq, req, res) {
            writeLine(rowOf(req.url), `(---) ${req.method} ${req.url}`);
            proxyReq.on('response', function(response) {
                writeLine(rowOf(req.url), `(${response.statusCode}) ${req.method} ${req.url}\n`)
            });
        }
    }
}