Add support for multiple configurations in .escheckrc

[cascornelissen]

Requested Update

Support arrays in .escheckrc so that different files can be checked with different options. Command-line options should probably overwrite the option for all configurations. Something like this:

[{
    "ecmaVersion": "es6",
    "module": false,
    "files": "{cjs,umd}/index.{cjs,js}"
}, {
    "ecmaVersion": "es2020",
    "module": true,
    "files": "esm/index.mjs"
}]

Why Is This Update Needed?

We have some projects that compile multiple bundles (e.g. UMD, CJS, and ESM) and they require different es-check flags/options. As an example, this is the command we currently use:

es-check es6 cjs/index.cjs umd/index.js && es-check es2020 esm/index.mjs --module

We were hoping to switch to using the separate .escheckrc file but I don't think it's possible to have multiple configurations in there at this point in time?

Are There Examples Of This Requested Update Elsewhere?

Not that we could find 🤷🏼‍♂️