Demo package for Stackoverflow question.
Build & run tests:
$ npm install
$ npm test
you will get an error:
> mocha_esm@1.0.0 test /...
> ./node_modules/mocha/bin/mocha --require esm --recursive './test/**/*.test.js'
TypeError [ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING]: A dynamic import callback was not specified.
at exports.importModuleDynamicallyCallback (internal/process/esm_loader.js:41:9)
at formattedImport (/.../node_modules/mocha/lib/esm-utils.js:6:23)
at Object.exports.requireOrImport (/.../node_modules/mocha/lib/esm-utils.js:23:14)
at Object.exports.loadFilesAsync (/.../node_modules/mocha/lib/esm-utils.js:33:34)
at Mocha.loadFilesAsync (/.../node_modules/mocha/lib/mocha.js:427:19)
at singleRun (/.../node_modules/mocha/lib/cli/run-helpers.js:156:15)
...
Remove type: "module" from package.json and run tests again:
$ npm test
> mocha_esm@1.0.0 test /...
> ./node_modules/mocha/bin/mocha --require esm --recursive './test/**/*.test.js'
Index
✓ `process` method runs correctly
Util
✓ runs correctly
2 passing (7ms)