Simplify Variants

[developit]

The ES5 "compat" version of safari-14-idb-fix was actually 2b smaller than the default (modern) version. Since the differences between the two were limited to "function" vs arrows and const vs var, there should also be no measurable performance tradeoff. Simplifying the package by shipping only ES5 will help ease usage in bundlers/runtimes with varying support for Package Exports.

The new directory layout is:

dist/
    index.js  <- ESM
    index.cjs  <- CJS
    iife.min.js  <- IIFE
    index.d.ts  <- types

All are ES5, all are minified via Terser.

[jakearchibald]

Would you recommend minifying here? I tend to only minify the iife version, since it's the one likely to be used without a bundler.

It's a bit of a pain during dev if you end up with something throwing in minified code.

[developit]

TBH there are good logical arguments in both directions. My main reason for minifying was just to strip out all the comments. One option that might be a nice middle ground would be:

Suggested change

	plugins: [simpleTS('./'), terser()],
	plugins: [
	simpleTS('./'),
	terser({
	mangle: false, // preserve all names
	output: {
	beautify: true // normalize/preserve whitespace
	}
	})
	],

[jakearchibald]

I'm going to move terser to only operate on the iife, but I'll do that in a follow-up commit.