babel-preset-es2015-loose-rollup

7.0.0 verified Sat Apr 25 auth: no javascript deprecated

Babel preset that combines es2015-loose and es2015-rollup presets for tree-shaking with Rollup. Note that version numbering is independent of Babel versions. This package is deprecated in favor of @babel/preset-env. Last release v7.0.0, no active maintenance. Not compatible with Babel 7.x (only Babel 6.x). Do not use for new projects.

Common errors

error Error: Cannot find module 'babel-preset-es2015-loose-rollup' ↓

cause Preset name typo or not installed locally or globally.

fix

npm install --save-dev babel-preset-es2015-loose-rollup and ensure .babelrc uses exact string.

error Error: Plugin/Cannot find preset 'es2015-loose-rollup' relative to directory ... ↓

cause Preset not in node_modules or misconfigured path.

fix

Install the preset locally and check that .babelrc is in the correct root directory.

error Requiring the preset directly in code throws 'Preset must be a string' or similar. ↓

cause Passing the required module instead of the preset name string in Babel API.

fix

Use presets: ['es2015-loose-rollup'] not presets: [require('babel-preset-es2015-loose-rollup')].

error Babel 7: Error: [BABEL] unknown preset: es2015-loose-rollup (While processing preset: ...) ↓

cause Using Babel 7 + babel-preset-es2015-loose-rollup which is incompatible.

fix

Upgrade to @babel/preset-env.

Warnings

deprecated This package is deprecated in favor of @babel/preset-env with "modules": false for Rollup tree-shaking. ↓

fix Replace with @babel/preset-env and set modules to false.

breaking Version 7.0.0 does not correspond to Babel 7; it is still for Babel 6 and will not work with Babel 7. ↓

fix Use @babel/preset-env for Babel 7 projects.

gotcha Loose mode may produce code that is not spec-compliant, potentially breaking edge cases. ↓

fix Avoid loose mode unless you fully understand the implications and test thoroughly.

gotcha The preset is specifically for use with Rollup; using with other bundlers may not yield tree-shaking benefits. ↓

fix Use @babel/preset-env with appropriate module format for other bundlers.

Install

npm install babel-preset-es2015-loose-rollup

yarn add babel-preset-es2015-loose-rollup

pnpm add babel-preset-es2015-loose-rollup

Imports

default

wrong

// Using require in code: const preset = require('babel-preset-es2015-loose-rollup')

correct

// In .babelrc: "presets": ["es2015-loose-rollup"]

Presets are configured via .babelrc or programmatic API, not directly imported as module.

name

wrong

// Wrong: 'es2015-loose-rollup' misspelled or using old 'es2015' prefix

correct

// Correct preset name string: 'es2015-loose-rollup'

Preset name must match exactly. Babel 6 only; for Babel 7 use @babel/preset-env with options.

config

wrong

// Common mistake: passing object instead of string: require('babel-core').transform(code, { presets: [require('babel-preset-es2015-loose-rollup')] })

correct

require('babel-core').transform(code, { presets: ['es2015-loose-rollup'] })

Preset names are strings, not required modules, in Babel 6 API.

Quickstart

Shows how to configure the preset in .babelrc for Babel 6 with Rollup.

{
  "presets": ["es2015-loose-rollup"]
}