Use node experimental-modules?

[ghost]

One way to avoid having to use babel, is to enable the --experimental-modules node feature.
So, for example, I'd run: node --experimental-modules main.mjs (mode here)

But, i can't seem to figure out how to make ava use experimental modules instead of relying on babel-register. Any clue?

[novemberborn]

AVA does not recognize test files with .mjs extensions. See #631 (comment). That comment still assumes use of a transpiler or @std/esm. I'm not sure how much we should change AVA to work with experimental Node.js features, though I'm open to this as long as the changes are not too intrusive.

I imagine you can forward the --experimental-modules flag to the worker processes by running node --experimental-modules ./node_modules/.bin/ava. Perhaps you can then import .mjs source files from your tests.

[jrgleason]

@novemberborn Nope...

node --experimental-modules ./node_modules/.bin/ava ./src/test/js/webdriver/tests/sampleTest.mjs 
(node:1742) ExperimentalWarning: The ESM module loader is experimental.

  ✖ Couldn't find any files to test

node --experimental-modules ./node_modules/.bin/ava ./src/test/js/webdriver/tests/sampleTest.js 
(node:1744) ExperimentalWarning: The ESM module loader is experimental.

⠹ (node:1745) ExperimentalWarning: The ESM module loader is experimental.

  1 test passed

[novemberborn]

@jrgleason you need to be using the latest AVA release (ava@next on npm), and configure it to recognize the mjs extension. But even then it may not work. #1810 has more discussion.

[dandv]

Indeed, it didn't work. I tried node --experimental-modules node_modules/.bin/ava ava-test.mjs and got

Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: