mochajs / mocha / 7561

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Support --require of ESM; closes #4281 (#4304)

* Support --require of ESM; closes #4281
Allow files/modules specified in `--require` to be ESM.

CommonJS loading is still supported and the default.

* Conditionally generate url for import
Windows compatible

* Add tests for --require ESM
As both .mjs and type=module (combined with cjs for good measure).

Updated linter to allow tests to use spread operator (ecmaVersion 2018)

Allow --require'd module to be an object, or "module"

* Revert change to eslintrc, use mocha to pass experimental flag

* Replace type() -> typeof
Add truthy check to handle null edge case

type(ES Module) => "module", but we treat it the same as an object

* Remove doc limitation for --require ESM

* Add note to --require docs about ESM support

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