Watch A Directory And Run Mocha JS With ES Modules When Files Change

This is how I'm running Mochajs in watch mode with ES Modules:

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mocha --watch --parallel

Adding `--parallel` is based off this comment to a GitHub issue about `--watch` not working by itself with ES Modules.

If you try to run `mocha --watch` without `--parallel` it produces errors like:

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Error [ERR_REQUIRE_ESM]: require() of ES Module
/file/path/file.mjs not supported.
Instead change the require of /file/path/file.mjs
to a dynamic import() which is available in all
CommonJS modules.

(I think I've done the dynamic import stuff before in other projects, but haven't tried it with Mocha yet)