Support ESM

[j-f1]

Ideally, ESM would be supported in pages as well as component files, and the project would be rewritten to use ESM throughout.

Unfortunately, the Babel transform @babel/plugin-transform-modules-commonjs converts both static and dynamic imports to require calls (and, of course, you won’t be able to import ESM-only packages with a top-level import statement). As a result, it isn’t feasible to compile away the ESM code.

This is ~blocked on:

• Node.js adding require.cache and require.extensions-like functionality to ESM loading
• Modify Eleventy to work with ECMAScript Modules (ESM) by default 11ty/eleventy#836