@ts-stack/multer 简化了将文件上传到基于 Nodejs 的后端

npm install @ts-stack/multer

import { multer } from '@ts-stack/multer';import express from 'express';import { createwritestream } from 'node:fs';// here `avatar`, `photos` and `gallery` - is the names of the field in the html form.const multer = new multer({ limits: { filesize: '10mb' } });const parseavatar = multer.single('avatar');const parsephotos = multer.array('photos', 12);const parsegroups = multer.groups([{ name: 'avatar', maxcount: 1 }, { name: 'gallery', maxcount: 8 }]);const app = express();app.post('/profile', async (req, res, next) =&gt; {  const parsedform = await parseavatar(req, req.headers);  // parsedform.file is the `avatar` file  // parsedform.formfields will hold the text fields, if there were any  const path = `uploaded-files/${parsedform.file.originalname}`;  const writablestream = createwritestream(path);  parsedform.file.stream.pipe(writablestream);  // ...});app.post('/photos/upload', async (req, res, next) =&gt; {  const parsedform = await parsephotos(req, req.headers);  // parsedform.files is array of `photos` files  // parsedform.formfields will contain the text fields, if there were any  const promises: promise<void>[] = [];  parsedform.files.foreach((file) =&gt; {    const promise = new promise<void>((resolve, reject) =&gt; {      const path = `uploaded-files/${file.originalname}`;      const writablestream = createwritestream(path);      file.stream.pipe(writablestream);      writablestream.on('finish', resolve);      writablestream.on('error', reject);    });    promises.push(promise);  });  await promise.all(promises);  // ...});app.post('/cool-profile', async (req, res, next) =&gt; {  const parsedform = await parsegroups(req, req.headers);  // parsedform.groups is an object (string -&gt; array) where fieldname is the key, and the value is array of files  //  // e.g.  //  parsedform.groups['avatar'][0] -&gt; file  //  parsedform.groups['gallery'] -&gt; array  //  // parsedform.formfields will contain the text fields, if there were any});</void></void>

import { multer } from '@ts-stack/multer';import express from 'express';const parseformfields = new multer().none();const app = express();app.post('/profile', async (req, res, next) => {  const parsedform = await parseformfields(req, req.headers);  // parsedform.formfields contains the text fields});

const errormessages = new map<errormessagecode string>([  ['client_aborted', 'client aborted'],  ['limit_file_size', 'file too large'],  ['limit_file_count', 'too many files'],  ['limit_field_key', 'field name too long'],  ['limit_field_value', 'field value too long'],  ['limit_field_count', 'too many fields'],  ['limit_unexpected_file', 'unexpected file field'],]);</errormessagecode>

import { Multer, MulterError, ErrorMessageCode } from '@ts-stack/multer';// ...try {  const multer = new Multer().single('avatar');  const parsedForm = await multer(req, req.headers);  // ...} catch (err) {  if (err instanceof MulterError) {    err.code // This property is of type ErrorMessageCode.    // ...  }}