test runner does not pass cli flags to test files when running --test

for example, running node --loader ts-node/esm --test a.test.ts will fail:

/// a.test.ts

import { test } from 'node:test'

test(async () => {
	const a: any = {};
});

the challenge is that each test file spawns a new process

this is obviously the case for any other node flag

A workaround is to use NODE_OPTIONS env variable (NODE_OPTIONS="--loader ts-node/esm" node --test a.test.ts). It would still be worth to find a better way to integrate loaders though.

Related: #43973

I am not sure what I did wrong on the first time I tested this, but I re-tested it and it does actually work.
see https://github.com/nodejs/node/blob/main/lib/internal/main/test_runner.js#L100-L102

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test runner does not pass cli flags to test files when running `--test` #43941

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test runner does not pass cli flags to test files when running --test #43941

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MoLow commented on Jul 22, 2022

aduh95 commented on Jul 23, 2022

aduh95 commented on Jul 26, 2022

MoLow commented on Aug 5, 2022

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test runner does not pass cli flags to test files when running `--test` #43941