Support require of ESM files

[lieser]

In my .mocharc.json I require an esm module. This is suported since Mocha 8.0.0 (mochajs/mocha#4304) and works fine if I run the tests from the command line.

With the adapter I however get the following error:

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: <...>\dkim_verifier@pl\test\helpers\sinonRegisterNode.mjs.js
require() of ES modules is not supported.
require() of <...>\dkim_verifier@pl\test\helpers\sinonRegisterNode.mjs.js from c:\Users\<user>\.vscode\extensions\hbenl.vscode-mocha-test-adapter-2.7.0\out\worker\bundle.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 sinonRegisterNode.mjs.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from <...>\dkim_verifier@pl\package.json.

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1192:13)
    at Module.load (internal/modules/cjs/loader.js:1040:32)
    at Function.Module._load (internal/modules/cjs/loader.js:929:14)
    at Module.require (internal/modules/cjs/loader.js:1080:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at c:\Users\<user>\.vscode\extensions\hbenl.vscode-mocha-test-adapter-2.7.0\out\worker\bundle.js:5645:17
    at Generator.next (<anonymous>)
    at c:\Users\<user>\.vscode\extensions\hbenl.vscode-mocha-test-adapter-2.7.0\out\worker\bundle.js:88:71
    at new Promise (<anonymous>)
    at __awaiter (c:\Users\<user>\.vscode\extensions\hbenl.vscode-mocha-test-adapter-2.7.0\out\worker\bundle.js:84:12) {
  code: 'ERR_REQUIRE_ESM'
}

As far as I can tell from the Mocha Explorer Log, the new Mocha (8.0.1) locally installed is used:

[2020-07-25 17:17:20.958] [INFO] Worker: Using the mocha package at <...>\dkim_verifier@pl\node_modules\mocha
[2020-07-25 17:17:21.152] [INFO] Worker: Patching Mocha

[hbenl]

I have added support for this to version 2.7.1.
Please test and tell me if it works for you.

[lieser]

It works now, thanks for the fast fix