Add ES6 Style Exports

[ColbyTresness]

Will update issue with more information later on.

[mhoeger]

@ColbyTresness - you brought this up, but putting here for posterity:
We'll wait until node.js has ES6 style export capabilities, and not worry about trying to enable an experimental node feature or transpiling user code (status of feature here).

[ColbyTresness]

Assigning myself so I don't forget about this

[jeffhollan]

I expect this is what this is tracking but any thoughts on why when I use things like:

import foo from './foo.js'

export default function() { }

I get errors in functions, where as for other node projects where I use node 10 it seems to work? VS Code is telling me something about CommonJS and I frankly don't know where CommonJS, ES6, and Node overlap and if this is related 😕 . Seems from link above seems like we are waiting for something with node?

EDIT: I think I may understand this now. Have only used this in projects with Babel before so I think it was converting to a node compatible format as node doesn't fully adhere to ES6 it appears? Who knows.. and I thought .NET Core / .NET Standard was strange. Is weird that VS Code prompts me to change this though.

[willmorgan]

@jeffhollan You're correct - Node currently just supports CJS style exports (that's require and module.exports = { stuff }. But with a flag, you can switch on ESM, which is in the experimental phase: https://nodejs.org/docs/latest-v10.x/api/esm.html

[ColbyTresness]

@jeffhollan Yes, the fact that VS Code prompts for this is a bug that I brought up with @fiveisprime. We left this issue open though since we'd like to support this once Node does.

[jeffhollan]

Nice thanks. @fiveisprime would be nice if any related code issue we could link

[bennypowers]

You might try using esm, which allows seamless interop between cjs and esm in older node versions:

npm i -S esm

// index.js
// ESM polyfill lets us write source code with Modules, while running CJS
// App code is in main.js.

// Set options as a parameter, environment variable, or rc file.
require = require('esm')(module/* , options*/);
module.exports = require('./main.js');

// main.js
export default async function(context, req) {
  context.log('JavaScript HTTP trigger function processed a request.');

  if (req.query.name || (req.body && req.body.name)) {
    context.res = {
      // status: 200, /* Defaults to 200 */
      body: `Hello ${req.query.name || req.body.name}`,
    };
  } else {
    context.res = {
      status: 400,
      body: 'ESM: Please pass a name on the query string or in the request body',
    };
  }
}

[zidzin]

Is it okay to write
require = require('esm')(module/* , options*/); module.exports = require('./main.js');
as
module.exports = require('esm')('./main.js');