[v18.20.5 / next v20.x LTS version] NodeJS should provide some kind of warning when using import assertions as they are non-standard

[alexsch01]

Clarification

v18.20.4 (previous v18.x release) and v20.18.0 have a warning for both import assertions and import attributes

v18.20.5 removes this warning for both cases, I believe the import assertion warning should still be around

Seems to be caused by #55333

Version

v18.20.5

Platform

All

Subsystem

No response

What steps will reproduce the bug?

node --input-type=module -e 'import "data:application/json,{}" assert { type: "json" }'

How often does it reproduce? Is there a required condition?

Every time

What is the expected behavior? Why is that the expected behavior?

Regarding [What steps will reproduce the bug?]

It should provide some kind of warning since import assertions (not import attributes) are non-standard

Additional information

This also applies to the next v20.x LTS version

[avivkeller]

Adding a warning is a breaking change, and LTS lines are meant to be non-breaking.

[alexsch01]

@redyetidev I should have clarified

v18.20.4 (previous v18.x release) and v20.18.0 have a warning for both import assertions and import attributes

v18.20.5 removes this warning for both cases, I believe the import assertion warning should still be around

[avivkeller]

Oh, okay. The removal / addition of a warning is typically semver major, I wonder why it was backported.

[alexsch01]

This is probably the cause #55333

[avivkeller]

Yes, likely.

[nicolo-ribaudo]

This is a bit difficult to fix, because V8 doesn't tell us which syntax is being used. Does any of the maintainers have any suggestion?

[aduh95]

We need to reconsider #51631

[alexsch01]

@aduh95 thanks for the PR, just letting you know that a v20.x version will be needed

[aduh95]

@alexsch01 I'm not sure why you ping me to repeat an information that's already in the OP. If you need a 20.x backport, make the PR yourself, or pay someone to do it for you (you can find support links in the README).

[alexsch01]

my apologies

[alexsch01]

Fixed in v20.18.3 thank you aduh95!

[data.json]

{"abc":"def"}

---

[script_with.mjs]

import data from './data.json' with {type: 'json'}

console.log(process.version)
console.log(data)

running in node

v20.18.3
{ abc: 'def' }

---

[script_assert.mjs]

import data from './data.json' assert {type: 'json'}

console.log(process.version)
console.log(data)

running in node

(node:1092) V8: file:///somelocation/script_assert.mjs:1 'assert' is deprecated in import statements and support will be removed in a future version; use 'with' instead
(Use `node --trace-warnings ...` to show where the warning was created)
v20.18.3
{ abc: 'def' }