@projectevergreen/acorn-jsx-esm

Acorn-JSX

This is plugin for Acorn - a tiny, fast JavaScript parser, written completely in JavaScript.

It was created as an experimental alternative, faster React.js JSX parser. Later, it replaced the official parser and these days is used by many prominent development tools.

This is a fork intended to satisfy a specific use case while awaiting the migration of the original package to ESM - https://github.com/acornjs/acorn-jsx/issues/112

Transpiler

Please note that this tool only parses source code to JSX AST, which is useful for various language tools and services. If you want to transpile your code to regular ES5-compliant JavaScript with source map, check out Babel and Buble transpilers which use acorn-jsx under the hood.

Usage

Requiring this module provides you with an Acorn plugin that you can use like this:

var acorn = require("acorn");
var jsx = require("@projectevergreen/acorn-jsx-esm");
acorn.Parser.extend(jsx()).parse("my(<jsx/>, 'code');");

Note that official spec doesn't support mix of XML namespaces and object-style access in tag names (#27) like in <namespace:Object.Property />, so it was deprecated in acorn-jsx@3.0. If you still want to opt-in to support of such constructions, you can pass the following option:

acorn.Parser.extend(jsx({ allowNamespacedObjects: true }))

Also, since most apps use pure React transformer, a new option was introduced that allows to prohibit namespaces completely:

acorn.Parser.extend(jsx({ allowNamespaces: false }))

Note that by default allowNamespaces is enabled for spec compliancy.

License

This plugin is issued under the MIT license.