JEST test support ES Module

[jaywcjlove]

Not yet ready: jest cannot run tests correctly in ESM mode and mocking in our tests will need rework. It's possible to have jest convert everything to CJS, however ESM-only features (e.g. import.meta.url) will then fail instead.

Ref:

• https://jestjs.io/docs/ecmascript-modules
• https://kulshekhar.github.io/ts-jest/docs/guides/esm-support/

Jest ESM support:

• Meta: Native support for ES Modules jestjs/jest#9430
• esm: implement import.meta.resolve and make nodejs: scheme public nodejs/node#31032
• import.meta not allowed  kulshekhar/ts-jest#1174
• Support ESM kulshekhar/ts-jest#1709
• [Bug]: SyntaxError: Cannot use 'import.meta' outside a module jestjs/jest#12183 (comment)

Code:

• e6f29fb

Issue:

• https://stackoverflow.com/a/50052194/1334703
• https://nodejs.org/api/esm.html#esm_no_require_exports_module_exports_filename_dirname

[jaywcjlove]

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