ES6 Module Transpiler System Formatter

0.3.0 verified Fri May 01 auth: no javascript deprecated

An output formatter for es6-module-transpiler that generates System.register() format, enabling ES6 module semantics (including delayed execution, circular dependencies, and live bindings) in ES5. Current stable version: 0.3.0 (2015, no further updates). It integrates with SystemJS and es6-micro-loader and is interchangeable with Traceur's output. Key differentiator: preserves ES6 semantics exactly via the transpiler pipeline, but is experimental and no longer maintained. Use modern tools like Babel or TypeScript instead.

Common errors

error Error: Cannot find module 'es6-module-transpiler-system-formatter' ↓

cause The package is not installed or the path is incorrect when using CLI -f option.

fix

Install the package locally: npm install es6-module-transpiler-system-formatter, then use -f ./node_modules/es6-module-transpiler-system-formatter.

error TypeError: SystemFormatter is not a constructor ↓

cause Using ES import (import SystemFormatter from ...) instead of CommonJS require.

fix

Use const SystemFormatter = require('es6-module-transpiler-system-formatter');

Warnings

deprecated This package is no longer maintained. Use modern transpilers like Babel or TypeScript with SystemJS. ↓

fix Migrate to Babel or TypeScript and use their respective module formats (System.register is still supported in SystemJS).

breaking Version 0.3.0 requires es6-module-transpiler 0.10. Incompatible with older versions. ↓

fix Ensure es6-module-transpiler is at version ^0.10.0 when using this package.

gotcha The output format is experimental and may change between minor versions, breaking System.register() consumers. ↓

fix Pin the exact version of this formatter and test compatibility with your loader.

gotcha This package does not support ES module syntax; it only works with CommonJS require. ↓

fix Use CommonJS require() to import the formatter; do not attempt ES import.

Install

npm install es6-module-transpiler-system-formatter

yarn add es6-module-transpiler-system-formatter

pnpm add es6-module-transpiler-system-formatter

Imports

SystemFormatter

wrong

import SystemFormatter from 'es6-module-transpiler-system-formatter';

correct

const SystemFormatter = require('es6-module-transpiler-system-formatter');

This package does not support ES module imports; it must be used via CommonJS require.

Quickstart

Demonstrates programmatic usage with es6-module-transpiler to transpile ES6 modules into System.register format.

var transpiler = require('es6-module-transpiler');
var SystemFormatter = require('es6-module-transpiler-system-formatter');
var Container = transpiler.Container;
var FileResolver = transpiler.FileResolver;

var container = new Container({
  resolvers: [new FileResolver(['lib/'])],
  formatter: new SystemFormatter()
});

container.getModule('index');
container.write('out/mylib.js');