ES6 from Java, using Nashorn

[Hannes Wallnöfer]

Hi Olivier,

Support for ECMAScript 6 is quite incomplete in Nashorn unfortunately. We only support a small set of ES6 features in JDK 9:

	• Template strings
	• let, const, and block scope
	• Iterators and for..of loops
	• Map, Set, WeakMap, and WeakSet
	• Symbols
	• Binary and octal literals

„require“ on the other hand is not part of ES6. It was created as a way to implement modules in the pre-ES6 world. It can be implemented in script and there are implementations out there, so this is probably the most promising approach to use modules in Nashorn.

Hannes

> Am 08.01.2018 um 17:33 schrieb Olivier <olivier.lediouris at oracle.com>:
> 
> Hi experts,
> I want to run ES6 scripts from Java, using Nashorn.
> I have scripts involving 'let', 'const', my Java code is happy with it, I just need to use a property "nashorn.args" set to "--language=es6".
> 
> Now, I'd like to move forward, use imports and modules.
> I have one script like this (modules.01.js):
> 
> function displayMessage() {
> console.log("Hello JS World!");
> };
> 
> export default displayMessage;
> 
> I want to consume it from this (modules.consume.js):
> 
> import displayMessagefrom './modules.01';
> 
> displayMessage();
> 
> But this is where I have a question:
> My engine.eval("load('./modules.consume.js');"); complains about the "import" statement.
> In the transpiled version, it complains about the "require" statement.
> 
> I must be missing something... I attach my code, in case it's needed.
> 
> Any idea, pointer, comment, help, etc, most welcome,
> Thank you!
> - Olivier
> 
> 
> 
> <Executor.java>