rollup-plugin-jsy-lite

1.7.3 verified Mon Apr 27 auth: no javascript

A Rollup plugin that transpiles JSY syntax to standard JavaScript without requiring Babel. Current stable version is 1.7.3, with a maintenance release cadence. It is part of the JSY language ecosystem, providing a lightweight alternative to Babel-based JSY transpilation by using the `@jsy-lang/jsy-lite` parser directly. Key differentiators: no Babel dependency, simple configuration, and support for multiple output formats (CJS, UMD, ESM). Suitable for projects that want to use JSY syntax with Rollup but avoid the complexity of Babel.

Common errors

error Error: Cannot find module 'rollup-plugin-jsy-lite' ↓

cause Package not installed or not in node_modules.

fix

Run npm install -D rollup-plugin-jsy-lite.

error SyntaxError: Unexpected token ↓

cause JSY file has syntax that is not valid JavaScript and plugin not applied.

fix

Ensure rollup-plugin-jsy-lite is added to the plugins array and file extension is .jsy.

error Error: You must specify 'output.format' ↓

cause Rollup configuration missing output format.

fix

Add a format property (e.g., 'cjs', 'es', 'umd') to output options.

Warnings

deprecated rollup-plugin-node-resolve is deprecated; use @rollup/plugin-node-resolve instead. ↓

fix Replace rollup-plugin-node-resolve with @rollup/plugin-node-resolve in devDependencies and import.

gotcha JSY files must have .jsy extension; otherwise plugin won't process them. ↓

fix Ensure input files use .jsy extension.

gotcha Plugin must be included in Rollup plugins array; no default processing. ↓

fix Add `rpi_jsy()` to the plugins array in rollup.config.js.

Install

npm install rollup-plugin-jsy-lite

yarn add rollup-plugin-jsy-lite

pnpm add rollup-plugin-jsy-lite

Imports

default

wrong

const rpi_jsy = require('rollup-plugin-jsy-lite')

correct

import rpi_jsy from 'rollup-plugin-jsy-lite'

ESM-only; use import syntax.

jsy

wrong

import { rpi_jsy } from 'rollup-plugin-jsy-lite'

correct

import { jsy } from 'rollup-plugin-jsy-lite'

Named export available as 'jsy', not 'rpi_jsy'.

plugin
```
import plugin from 'rollup-plugin-jsy-lite'
```
Default export is the plugin function; can be imported with any name.

Quickstart

Example Rollup configuration using rollup-plugin-jsy-lite to transpile JSY syntax with node-resolve plugin.

import rpi_jsy from 'rollup-plugin-jsy-lite';
import resolve from '@rollup/plugin-node-resolve';

export default {
  input: 'src/index.jsy',
  output: {
    file: 'dist/index.js',
    format: 'cjs'
  },
  plugins: [
    resolve(),
    rpi_jsy()
  ]
};