Trailing comma in dynamic import should be allowed also when used in a typeof type

[nicolo-ribaudo]

🔎 Search Terms

trailing comma dynamic import

🕗 Version & Regression Information

• This is the behavior in every version I tried

⏯ Playground Link

https://www.typescriptlang.org/play/?#code/CYUwxgNghgTiAEBbA9sArhBAiAZs5W8A3gL4BQZYyAdgM4Au8AbvALzxQDuUAloz4gAOyGPQAUufFgA0ASgDcZegE9BCACpt4KtchzwBw0RLwE5iyjQbMATFq69+QkeMlnS5pao132OkHoGzsZuMh4KZEA

💻 Code

declare module "foo" {}

const v = await import("foo",);
type T = typeof import("foo",);

const v2 = await import("foo",{},);
type T2 = typeof import("foo",{},);

🙁 Actual behavior

The trailing commas in the type-level import()s are reported as syntax error

🙂 Expected behavior

The syntax of import() at the type-level should match the one at the value level, thus allowing trailing commas.

Additional information about the issue

Note that the error was correct before import attributes, but import attributes changed the dynamic import syntax to allow trailing commas.

[nicolo-ribaudo]

If this issues gets triaged as a real bug and anybody wants to open a PR, the fix will probably be by changing something in the parseImportType function in src/compiler/parser.ts