deno support for import assertions?

[uriva]

the popular webtorrent lib has lines like this:

import json from "./MyJSON.json" assert { type: "json" };

when imported as npm:webtorrent this improt trips deno's compiler and a very cryptic hard to debug error message is output:

error: Uncaught SyntaxError: Unexpected token 'i', "import {cr"... is not valid JSON

is this feature supported in deno? why is the error message not with file and line numbers?

is there some solution to this?

thanks

Related #19834

[petamoriken]

Import Attributes (ex-Import Assertions) are Stage 3 now. We should wait for ECMAScript progress.

related: #17944

[andreubotella]

Deno has supported import assertions and JSON modules since 1.17.0. (In fact, recently the import assertions proposal was renamed to import attributes and the assert keyword changed to with, and Deno's existing support of assert means it will have to continue shipping that keyword for at least some time.)

The reason your import is failing seems to be because the JSON file you're importing isn't valid JSON syntax, but seems to be JS or TS.

[uriva]

https://github.com/webtorrent/webtorrent/blob/master/index.js#L20

https://github.com/webtorrent/webtorrent/blob/master/package.json

seems like valid json

[uriva]

@ThaUnknown maybe you'll have an idea?

[ThaUnknown]

my idea is that webtorrent doesn't support deno, as I've already told you once before

[sigmaSd]

it seems like the node compat doesn't support npm packages that have import assertion

this fails the same way import "npm:@sigmasd/a/a.js"; where a.js only have this

import b from "./b.json" assert { type: "json" };
console.log(b);

[await-ovo]

Is it related to #17942 ?