Awesome
Overview
esdown is an ES6+ to ES5 compiler, written in ES6. It will allow you to write programs using next-generation Javascript features without having to wait for Node or browsers to fully implement them.
esdown can also be used as a runtime environment for executing ES6+ programs on top of Node.
You can demo esdown by using the browser REPL.
For more information:
- The Feature Guide describes the ES6+ features that you can use with esdown.
- The Module Guide describes the ES6 module system implemented in esdown.
- Limitations describes some limitations and caveats regarding code produced by esdown.
Instructions
Install globally with NPM (you may need to sudo
this):
npm install -g esdown
Start a REPL by running it without any arguments:
esdown
Execute a module by adding a path:
esdown main.js
Translate a module by using a hyphen:
esdown - src/main.js build/esdown.js -b -r
--input, -i (1) The file to translate.
--output, -o (2) The file to write to. If not set, then the output
will be written to the console.
--bundle, -b If present, module dependencies will be bundled
together in the output.
--global, -g If specified, the name of the global variable to
dump this module's exports into, if the resulting
script is not executed within any module system.
API
esdown can also be used as a library. First, install locally with NPM:
npm install esdown
translate(input, options = {})
Translates ES6+ code to ES5. The following options are defined:
- module: (Boolean) If
true
, parse the input as a module. Otherwise, parse the input as a script. The default isfalse
. - global: (String) If specified, the name of the global variable which will be used to expose the module if it is loaded as a plain script in the browser.
Example:
var esdown = require("esdown");
var output = esdown.translate("class C { foo() {} }", {
module: true
});