es6-transpiler

0.7.18 verified Fri May 01 auth: no javascript deprecated

An ES6 to ES5 transpiler that focuses on producing output without a runtime library, using only polyfills when necessary. It avoids try/catch for block binding, supports spread via .concat with iterator protocol, and strives for minimal temporary variables. The project is in beta and supports classes, destructuring, block binding (let/const), arrow functions, spread, for-of, comprehensions, template strings, object literals, binary/octal literals, unicode code point escapes, and RegExp flags. It does not support modules, generators, or symbols. Release cadence: dormant; latest version 0.7.18 from 2015. Key differentiator: no runtime library, line-to-line mapping, Closure Compiler support.

Common errors

error Cannot find module 'es6-transpiler' ↓

cause Package not installed or not found in node_modules.

fix

Run 'npm install es6-transpiler' in your project directory.

error TypeError: es6transpiler.transpile is not a function ↓

cause Incorrect import: using import instead of require on a CommonJS module.

fix

Use 'var es6transpiler = require("es6-transpiler");' instead of ES module import.

error SyntaxError: Unexpected token import (or other ES6 syntax) in transpiled output ↓

cause Transpiler does not support 'import' statements (modules).

fix

Remove modules from source or use another transpiler like Babel.

Warnings

deprecated Project is no longer maintained; not compatible with modern Node.js versions (ES6 features in V8 have diverged). ↓

fix Use Babel or Typescript for ES6 transpilation.

breaking Requires an Object.create polyfill for older browsers (e.g., IE8). ↓

fix Include es5-shim or a polyfill before using the output.

gotcha The transpiler does not support modules, generators, or Symbol; if used on code with these, it may produce incorrect output or crash. ↓

fix Avoid using unsupported ES6 features or switch to a more modern transpiler.

gotcha The package does not ship TypeScript definitions; types must be declared manually. ↓

fix Define your own type declarations or use @ts-ignore.

gotcha The transpile function returns an object; it is not a streaming transform. For Gulp/Grunt, use wrapper plugins. ↓

fix Use grunt-es6-transpiler or gulp-es6-transpiler for build tool integration.

Install

npm install es6-transpiler

yarn add es6-transpiler

pnpm add es6-transpiler

Imports

transpile

wrong

import { transpile } from 'es6-transpiler';

correct

var transpile = require('es6-transpiler').transpile;

Package is not an ES module; only CommonJS require works.

default

wrong

import es6transpiler from 'es6-transpiler';

correct

var es6transpiler = require('es6-transpiler');

No default export; require returns an object with transpile method.

run

var es6transpiler = require('es6-transpiler'); es6transpiler.run(src, options);

run() is available for programmatic use with source string.

Quickstart

Demonstrates programmatic usage: require, transpile a simple ES6 snippet, and log the output ES5 source.

var es6transpiler = require('es6-transpiler');
var result = es6transpiler.transpile('let x = 1; const y = 2;');
console.log(result.src);
// Optionally configure with options object:
var result2 = es6transpiler.transpile('() => 42', { environments: ['node'] });
console.log(result2.src);