support import attributes

[ahabhgk]

https://github.com/tc39/proposal-import-attributes

• webpack-tests/cases/json/import-assertions-type-json

[chenjiahan]

@ahabhgk what's the current status of this issue?

I tried the following code in Rspack and it works:

import test from "./foo.json" with { type: "json" };

console.log(test);

[chenjiahan]

I think it was transformed by SWC, if I add the swc.jsc.experimental.keepImportAttributes: true option, I will get the parsing error:

[stale]

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