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

🔎 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.

从链接的 TypeScript Playground 开始，复现值级别和类型级别动态导入中使用尾随逗号的情况。比较这两种形式的解析方式，然后为两个示例添加回归覆盖。完成标准是 typeof import() 接受与值级别 import() 相同的尾随逗号语法。