js2coffee

library2.2.0jsnpmunverified

JavaScript to CoffeeScript compiler. v2.2.0 (latest) rewrites the 0.x series with a new Esprima-based parser, offering better JavaScript coverage. Released on npm and Bower. Key differentiator: unidirectional conversion from JS to CoffeeScript with warnings for unrepresentable patterns.

data

npm install js2coffee

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · JS2COFFEE

js2coffee

datajavascriptv2.2.0

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

js2coffee

✓ const js2coffee = require('js2coffee')

✗ import js2coffee from 'js2coffee' (ESM not supported)

CommonJS only. Use require() or window.js2coffee for browser.

build

✓ js2coffee.build(source)

✗ js2coffee(source)

build is the main API method returning { code, ast, map, warnings }

version

✓ js2coffee.version (string)

Read-only property exposing library version

Compile JavaScript to CoffeeScript using the build method, outputting CoffeeScript code.

const js2coffee = require('js2coffee'); const source = ` var x = 1; function hello(name) { console.log('Hello, ' + name); } hello('world'); `; const result = js2coffee.build(source); console.log(result.code); // x = 1 // hello = (name) -> // console.log 'Hello, ' + name // hello 'world'

js2coffee --version

Debug

Known issues

breaking2.0 release rewrites API: 0.x `js2coffee.js2coffee()` no longer works

fix

Use `js2coffee.build()` instead of the old `js2coffee.js2coffee()`

affects: >=2.0

deprecated0.x series is deprecated. No longer supported.

fix

Upgrade to v2.x using the migration guide

affects: <2.0

gotchaNot all JavaScript constructs convert cleanly; result.warnings may contain warnings for unrepresentable patterns

fix

Check result.warnings array after conversion and handle accordingly

affects: >=2.0

Errors

Common errors & fixes

Cannot find module 'js2coffee'

Package not installed

fix

npm install js2coffee

js2coffee is not a function

v2.x does not have a default export

fix

Use js2coffee.build() instead of trying to call js2coffee()

require(...).js2coffee is not a function

0.x API does not exist in v2

fix

Update to js2coffee.build() for v2

Upgrade

Version history

2.2.0latest on npm

Audit

Dependencies

esprimarequiredJavaScript parser used to parse input

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/js2coffee/js2coffee ↗

packagehttps://www.npmjs.com/package/js2coffee ↗

homepagehttp://js2.coffee ↗