Missing support for ES modules in node v13.

[npfedwards]

As of node v13.2, ES Modules are no longer hidden behind the --experimental-modules flag. When creating a project with "type":"module" in package.json and running mocha, the following error happens.

Warning: require() of ES modules is not supported.
require() of /path/to/componentTest.js from /path/to/node_modules/mocha/lib/mocha.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename componentTest.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /path/to/package.json.
/path/to/node_modules/mocha/lib/mocha.js:1
Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /path/to/componentTest.js

The offending line being

at Mocha.loadFiles (/path/to/node_modules/mocha/lib/mocha.js:331:14)

It seems to me, either this is a fairly large oversight in mocha, or there's a lack of documentation for this issue (all I've found in google is a comment on a closed issue).

Node: v13.2.0
Mocha: v6.2.2
npm: v6.13.1

[npfedwards]

Duplicate of #3006