babel-preset-es2040

1.1.1 verified Sat Apr 25 auth: no javascript deprecated

A Babel preset that enables a very small subset of ES6 features deemed essential by its authors, deliberately omitting most ES2015+ syntax. Version 1.1.1 is the latest and final release. It is an experimental, opinionated alternative to larger presets like babel-preset-env. Note: the name 'es2040' is ironic, indicating a minimal, possibly frivolous approach. The package is not actively maintained and is not recommended for new projects.

Common errors

error Module not found: Can't resolve 'babel-preset-es2040' in ... ↓

cause Babel cannot locate the preset if not installed or if the name resolution is incorrect.

fix

Run npm install --save-dev babel-preset-es2040 and ensure it's in node_modules.

error Error: [BABEL] unknown preset: es2040 ↓

cause Babel 7 requires the full package name if the default resolution fails.

fix

Change .babelrc to {"presets": ["babel-preset-es2040"]}.

error SyntaxError: Unexpected token (something like import/const/arrow etc.) ↓

cause The preset does not include the plugin for that feature.

fix

Use a different preset like babel-preset-env that supports the needed syntax.

Warnings

deprecated Package is no longer maintained and may not work with modern Babel versions (v7+). ↓

fix Migrate to babel-preset-env or a custom preset with chosen plugins.

breaking Babel 7 dropped support for presets without babel-preset- prefix in the name, requiring full package name in .babelrc. ↓

fix Use { "presets": ["babel-preset-es2040"] } or switch to a compatible preset.

gotcha Only a tiny subset of ES6 features are supported; most modern syntax will fail to compile. ↓

fix Check the list of supported plugins in the package source, or use a more comprehensive preset.

gotcha Package name includes 'es2040' but actually targets a subset of ES6 (ES2015), not ES2020. ↓

fix Do not assume it provides ES2020 features; refer to source for actual plugins.

Install

npm install babel-preset-es2040

yarn add babel-preset-es2040

pnpm add babel-preset-es2040

Imports

default export
wrong
```
import preset from 'babel-preset-es2040'
```
correct
```
module.exports = require('babel-preset-es2040')
```
This preset is a CommonJS module. ESM import will fail unless using a bundler that handles CJS interop.
.babelrc config
wrong
```
{"presets": ["babel-preset-es2040"]}
```
correct
```
{"presets": ["es2040"]}
```
Babel resolves the preset name 'es2040' to the package 'babel-preset-es2040'. Do not include the full package name in most cases.

Node API usage

wrong

require('babel-core').transform('code', { presets: [require('babel-preset-es2040')] })

correct

require('babel-core').transform('code', { presets: ['es2040'] })

Passing the preset object directly is also valid but unnecessary. The string name works via Babel's resolution.

Quickstart

Install the preset, configure .babelrc to use it, and compile a JavaScript file with Babel CLI.

npm install --save-dev babel-preset-es2040
# .babelrc
{
  "presets": ["es2040"]
}
# Then run babel on your files
npx babel script.js --presets es2040