es6 modules

[naliferov]

Hi! What about to pkg of an app that use es6 modules? Is pkg correctly works with such apps?

[marcj]

Yes

[luxzeitlos]

It seems not to work for me:

SyntaxError: Unexpected token export
    at new Script (vm.js:84:7)
    at Socket.<anonymous> ([eval]:18:19)
    at Socket.emit (events.js:198:13)
    at addChunk (_stream_readable.js:287:12)
    at readableAddChunk (_stream_readable.js:268:11)
    at Socket.Readable.push (_stream_readable.js:223:10)
    at Pipe.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
C:\snapshot\app\dist\src\tools\deps-resolver.js:772
export function resolveDeps(detBundles) {
^^^^^^

[pedrohenriquebr]

Maybe using Babel will works

[luxzeitlos]

sure, I could transform to AMD or common.js. But thats not the point here. Native ESM does not work.

[Daniel-Olivier]

Which version of Node JS are you targeting when building your project?

[alexander-girsh]

@Daniel-Olivier Hi, I had some issue with {type: module} and .mjs/.js files. Node version was 14.4, pkg target was node14-alpine-x64

[Daniel-Olivier]

Hi @noguilty4you

Are you experiencing the exact same issue and receiving SyntaxError: Unexpected token export errors?

[alexander-girsh]

@Daniel-Olivier, yes. Yesterday I refactored the whole project to using commonjs modules and so I have no problems =(

[MichaelKorn]

I took a look at the situation, especially since several open issues are related to es6 modules.
es6 modules are not supported!

1. The caching cannot work like this:
   

   pkg/lib/fabricator.js

   Lines 20 to 25 in 52b4933

   	var code = module.wrap(body);
   	var s = new vm.Script(code, {
   	filename: snap,
   	produceCachedData: true,
   	sourceless: true
   	});

   
   1.1. vm.Script is just for CommonJS modules. For ECMAScript modules vm.Modules and vm.SourceTextModule have be be used.
   1.2. node must be run with --experimental-vm-modules
2. ECMAScript modules can not be started within the output file (eg. .exe) , because only CommonJS is considered in https://github.com/vercel/pkg/blob/master/prelude/bootstrap.js
   2.1 In particular, _load() is a legacy way to run CommonJS modules:

   pkg/prelude/bootstrap.js

   Lines 1378 to 1381 in 52b4933

   	Module.runMain = function () {
   	Module._load(ENTRYPOINT, null, true);
   	process._tickCallback();
   	};

[hipstersmoothie]

closing duplicate of #782