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Showing content from https://github.com/zenparsing/esdown below:

zenparsing/esdown: ES6+ to ES5 Compiler

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.

Install globally with NPM (you may need to sudo this):

Start a REPL by running it without any arguments:

Execute a module by adding a path:

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.

esdown can also be used as a library. First, install locally with NPM:

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 is false.
• 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
});

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