Convert to ESM

[remcohaszing]

Because 5f2b26a introduced breaking changes, I think now would be the right time to convert to ESM.

[wooorm]

What does that commit break?
All these packages are used a lot in electron, and by folks who have no clue about Node.js/JavaScript, so im delaying this project

[remcohaszing]

• It introduces let syntax, which breaks compatibility with node 0.12
• It introduces arrow functions, which breaks compatibility with node 0.12
• It changes the fallback values of exception and result from null to undefined. Although technically this isn’t a breaking change, because an exception can never occur while reading the aff and dic files.

I personally don’t care for such old Node.js versions, but given the initial release date of this project and the lack of an engines field and Compatibility section in the readme, those are technically breaking changes.

[wooorm]

Node 0.12 and this project are both 7 years old. I don’t really see this problem

[wooorm]

Compared to the ESM problem, which is definitely a major

[remcohaszing]

If electron support is really important, but old Node.js version support isn't, then never mind this issue 🙂

[wooorm]

A lot of folks are getting these dictionaries by manually downloading them and placing the files somewhere. They often don’t know about Node, npm, or JavaScript.