Node.js : CommonJS to ES Module in 4 Steps without Transpiling or Babel Node
Jul 12, 2023
With some adjustment we don’t need babel and transpiling.
Just Node.js. Up and running !
First of all, add type: module into your package.json
Here we go to fix the error.
Problem 1: File Naming
The module need to be the exact name.
It also makes sense to set this. Some reason behind this is that the module might guess wrong when you have .js and .ts in the same directory.
directory
|_ a.js
|_ b.jsimport a from 'a'
// NOT WOKRING
import a from 'a.js'
// WOKRING
|_ a.js
|_ b.jsimport a from 'a'
// NOT WOKRING
import a from 'a.js'
// WOKRING
Problem 2: __dirname
After migration, the __dirname is not working anymore.
Here are the alternative:
// BEFORE
readFileSync(path.join(__dirname, './data.proto'))// AFTER
readFileSync(new URL('./data.proto', import.meta.url))
readFileSync(path.join(__dirname, './data.proto'))// AFTER
readFileSync(new URL('./data.proto', import.meta.url))
Problem 3: Incompatible CJS Named import
Sometimes, there are lib that’s not yet compatible with ‘Named import’
import sequelize from 'sequelize'
const { STRING, ARRAY } from sequelize
const { STRING, ARRAY } from sequelize
Problem 4: ReferenceError: require is not defined
Sometimes, there are the mixin style required
For example, winston-daily-rotate-file this one mutate the imported winston instance.
import { createRequire } from 'module';
const require = createRequire(import.meta.url);require('...')
// working !
const require = createRequire(import.meta.url);require('...')
// working !
Here we go. Now we finish migrating.
Cheers !
Tag :
Recommended for you
Fix Azure Cache for Redis Long Hangup and Unstable Connection for Node.js Node-Redis
Jul 14, 2023
4 min read
The Missing Guide on Node.js Stream Part 1: Pipe, Pipeline and Writing Transform
Jul 14, 2023
2 min read
The Missing Guide on Node.js Stream Part 2: Object mode, Read, Write, Transform and Compatibility
Jul 14, 2023
2 min read
How to Test Sending SMTP Email locally with Nodemailer
Jul 14, 2023
1 min read
[HPM] Error occurred while proxying request [ECONNRESET]
Jul 14, 2023
2 min read
SequelizeDatabaseError missing FROM-clause entry for table
Jul 12, 2023
1 min read
