Port cytoscape.js-dagre to ESM

[ayjayt]

So, I did this.

It's a bit different for your strategy for cytoscape:

1) I hand converted the cjs to esm, and put it in mjs-src.. 2) I use babel to convert the esm back to cjs in src/. 3) I make sure the transpiled cjs works the same as it used to in everyway- tests, webpack, demos, etc. 4) I also converted all the deps to esm by hand.

I had never used rollup before (it seems a better strategy for native cjs repos, I also like that it's procedural and not entirely configuration based).

5) I installed rollup, and just use it to output a bundled version of of min/normal .esm.js, but the source code is still there in esm format.

TODO

• [ ] Undo this strategy, go back to native cjs, and configure rollup to output ESM from that?
• [ ] double check rollup config
• [ ] Fix cytoscape as here.
• [ ] Get linter looking at esm not at old cjs.
• [ ] Improve README.
• [ ] ESM Browser demo needs local server because of cors, tbh.

[stale[bot]]

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