babel-plugin-minify-type-constructors

0.4.3 verified Sat Apr 25 auth: no javascript maintenance

A Babel plugin that minifies type constructors like Boolean(), Number(), String(), Array(), and Object() where possible (e.g., replacing `new Boolean(x)` with `!!x` or `new Number(x)` with `+x`). Part of the babel-minify (formerly babili) minification preset. Version 0.4.3 is the latest stable release (2018). The babel-minify project is now in maintenance mode; no new features are expected. This plugin should be used with caution in environments requiring IE8 or lower due to potential compatibility issues. It is designed to work as part of a Babel minification pipeline, complementing other minify plugins.

Common errors

error Error: Cannot find module 'babel-plugin-minify-type-constructors' ↓

cause Package not installed or missing in node_modules.

fix

npm install babel-plugin-minify-type-constructors --save-dev

error ReferenceError: Boolean is not defined (or similar) in transformed code ↓

cause Plugin transforms `new Boolean(x)` to `!!x`, which may not be equivalent in all edge cases (e.g., `new Boolean(false)` is truthy).

fix

Review transformed code and possibly disable plugin for sensitive cases.

Warnings

breaking Not recommended for full IE8 and lower support due to potential issues with object wrappers. ↓

fix Use only in modern environments or apply polyfills.

deprecated The babel-minify project is no longer actively maintained. Prefer babel-preset-minify or community alternatives. ↓

fix Migrate to babel-preset-minify (which includes this plugin) or other minifiers.

gotcha Potential breaking due to missing dependencies in babel-minify@0.5.0 and 0.5.1. ↓

fix Use version 0.4.3 or upgrade to a later patch if available.

Install

npm install babel-plugin-minify-type-constructors

yarn add babel-plugin-minify-type-constructors

pnpm add babel-plugin-minify-type-constructors

Imports

default

module.exports = require('babel-plugin-minify-type-constructors');

CommonJS style; works in Node.js with Babel.

default

import minifyTypeConstructors from 'babel-plugin-minify-type-constructors';

ESM import; requires bundler or Node.js with ESM support.

default

wrong

plugins: ['minify-type-constructors']

correct

plugins: ['babel-plugin-minify-type-constructors']

In Babel config, use the full package name.

Quickstart

Shows how to add the plugin to Babel config and the type constructor minification transform.

// babel.config.js
module.exports = {
  plugins: [
    'babel-plugin-minify-type-constructors'
  ]
};

// Input: var a = new Boolean(true); var b = new String('hello');
// Output: var a = !!true; var b = 'hello';