babel-messages

6.23.0 verified Sat Apr 25 auth: no javascript deprecated

A utility package that provides a collection of debug messages used internally by Babel during code transformation and compilation. This package (v6.23.0) is now deprecated in modern Babel versions (v7+) and is no longer updated separately as messages are embedded directly in code or handled by @babel/code-frame. It offers functions like get(key) to retrieve localized message strings. Key differentiator: it is a legacy internal module with no standalone value for end users beyond historical reference.

Common errors

error Cannot find module 'babel-messages' ↓

cause Package not installed or removed in newer Babel versions.

fix

npm install babel-messages@6.23.0 --save-dev (but prefer migrating away)

error import messages from 'babel-messages'; console.log(messages.get('...')) TypeError: messages.get is not a function ↓

cause Default import yields undefined because the module uses namespace export.

fix

Use import * as messages from 'babel-messages' instead.

error Module not found: Error: Can't resolve 'babel-messages/definedMessages' ↓

cause Subpath export 'babel-messages/definedMessages' does not exist.

fix

Import from 'babel-messages' directly: import { definedMessages } from 'babel-messages'

Warnings

deprecated babel-messages is deprecated in Babel v7 and removed in v8. All messages have been moved to @babel/code-frame or embedded directly. ↓

fix Replace usage with @babel/code-frame or handle messages manually.

gotcha Importing using default import (import messages from 'babel-messages') returns undefined. ↓

fix Use import * as messages from 'babel-messages' or named imports like { get }.

gotcha The package only exports get() and definedMessages. Other symbols like set() are not public. ↓

fix Only use the documented exports: get and definedMessages.

Install

npm install babel-messages

yarn add babel-messages

pnpm add babel-messages

Imports

messages

wrong

import messages from 'babel-messages'

correct

import * as messages from 'babel-messages'

Module only supports namespace import, not default import.

get method
wrong
```
const { get } = require('babel-messages')
```
correct
```
import { get } from 'babel-messages'
```
Works with both named import and destructured require, but the package is deprecated and not recommended for new code.

definedMessages

wrong

import definedMessages from 'babel-messages/definedMessages'

correct

import { definedMessages } from 'babel-messages'

definedMessages is exported as a named export; subpath import is not supported.

Quickstart

Shows how to import and use the get() function to retrieve a debug message, and how to list all available message keys via definedMessages.

import { get, definedMessages } from 'babel-messages';

// Get a specific debug message
console.log(get('tailCallReassignmentDeopt'));
// → "Function reference has been..."

// List all defined message keys
console.log(Object.keys(definedMessages));
// → ['tailCallReassignmentDeopt', ...]