babel-preset-stage-0

6.24.1 verified Sat Apr 25 auth: no javascript deprecated

Babel preset that enables all stage 0 (strawman) JavaScript proposal plugins. Version 6.24.1 is the latest stable release; this package is part of Babel 6 and has been deprecated in favor of individual proposal plugins or @babel/preset-env with targets. It includes plugins for syntactic proposals like do-expressions, pipeline operator, and throw expressions. No longer maintained; users should migrate to Babel 7/8 and use specific plugins.

Common errors

error Error: Cannot find module 'babel-preset-stage-0' ↓

cause Package not installed or version mismatch

fix

npm install --save-dev babel-preset-stage-0@6.24.1

error Error: Plugin/Preset files are not allowed to export objects, only functions. ↓

cause Using an older Babel 6 preset with Babel 7

fix

Upgrade to @babel/preset-stage-0 or use Babel 6

error TypeError: (intermediate value) is not a function ↓

cause Babel 7 dropped support for stage presets

fix

Migrate to @babel/preset-env and individual plugins

Warnings

deprecated babel-preset-stage-0 is deprecated in Babel 7+ ↓

fix Use @babel/preset-env with specific targets or individual plugins.

breaking Stage presets are removed in Babel 8 ↓

fix Migrate to @babel/preset-env and explicit plugin configuration.

gotcha Including stage-0 enables unstable proposals that may change or be removed ↓

fix Pin exact Babel version and update proposals carefully.

deprecated Stage presets depend on deprecated babel-preset-stage-1, -2, -3 ↓

fix Remove stage presets and use individual plugins for needed proposals.

Install

npm install babel-preset-stage-0

yarn add babel-preset-stage-0

pnpm add babel-preset-stage-0

Imports

preset-stage-0
wrong
```
import presets from 'babel-preset-stage-0'
```
correct
```
require('babel-preset-stage-0')
```
CommonJS require is used; ESM import not supported.

default

wrong

module.exports = { presets: ['babel-preset-stage-0'] }

correct

module.exports = { presets: ['stage-0'] }

Preset names can be shorthand; no need for full package name in .babelrc.

transform

wrong

babel.transform(code, { presets: [require('babel-preset-stage-0')] })

correct

babel.transform(code, { presets: ['stage-0'] })

Passing preset name as string is idiomatic.

Quickstart

Shows how to install and configure the stage-0 preset, then use a pipeline operator (stage-0 proposal).

// Install: npm install --save-dev babel-preset-stage-0
// .babelrc
{
  "presets": ["stage-0"]
}

// Example JS with stage-0 features
// Pipeline operator: 2 |> double |> square
const double = x => x * 2;
const square = x => x * x;
const result = 2 |> double |> square;
console.log(result); // 16