Update UMD to have an export

[JonathanWolfe]

https://github.com/umdjs/umd/blob/6e693154138b111e17b264e4e27f76e6116f1aba/returnExports.js#L17-L37

Update the UMD to an export variant to allow for node require-ing of pre-compiled tags that used the --modular flag.

[GianlucaGuarini]

@JonathanWolfe thank you for your pull request I see you have removed the require, export, module variables but they were used to solve riot/riot#1044 Is there a reason you want to have an export for node? riot.tag2 does not return anything special

[JonathanWolfe]

About riot/riot#1044 - No, I didn't realize it was used for anything.

The problem I'm facing is that node pre-rendering doesn't work (anymore?) because when require-ing the .tag it fails to compile because the node compiler doesn't require('riot').

const riot = require('riot');
const tag = require('./example.tag');

riot.render( example, { foo:'bar'} )

Returns:

ReferenceError: riot is not defined
    at Object.<anonymous> (/Users/jonwolfe/repos/hopspot/src/templates/pages/app.tag:1:80)
    at Module._compile (module.js:425:26)
    at Object.require.extensions..tag (/Users/jonwolfe/repos/hopspot/node_modules/riot/lib/server/index.js:14:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:311:12)
    at Module.require (module.js:366:17)
    at require (module.js:385:17)
    at loadSite (/Users/jonwolfe/repos/hopspot/server/prerender.js:33:20)
   at ...express stuff...

But if you pre-compile the tags to .js (with modular flag) then require them you get:

TypeError: tagName.toUpperCase is not a function
    at new simple$dom$document$element$$Element (/Users/jonwolfe/repos/hopspot/node_modules/simple-dom/dist/simple-dom.js:161:25)
    at simple$dom$document$$Document.createElement (/Users/jonwolfe/repos/hopspot/node_modules/simple-dom/dist/simple-dom.js:299:14)
    at createTag (/Users/jonwolfe/repos/hopspot/node_modules/riot/lib/server/index.js:21:23)
    at Object.riot.render (/Users/jonwolfe/repos/hopspot/node_modules/riot/lib/server/index.js:27:13)
    at loadSite (/Users/jonwolfe/repos/hopspot/server/prerender.js:36:24)
    at ...express stuff...

Because the returned value of the node require statement is {} not the tag because the module doesn't export anything.

So if you add an export the UMD and return the tag statement, you'll get back a tag that riot.render can then process.

[GianlucaGuarini]

I have already fixed it ;) riot/riot#1307

[JonathanWolfe]

Oh. Well you can do whatever you want with this PR then :)

[GianlucaGuarini]

😄 @JonathanWolfe thanks anyway we have always 1000 things to do and it's always good if other devs like you could help us on the project. I will close this issue and thanks again for testing the beta