TS2742 “The inferred type of 'default' cannot be named” with ESLint `defineConfig`

还没有人认领这个 Issue。

### 🔎 Search Terms

TS2742, 2742, composite, pnpm

### 🕗 Version & Regression Information

- This is the behavior in every version I tried, and I reviewed the FAQ for entries about TS2742

### ⏯ Playground Link

_No response_

### 💻 Code

**`eslint.config.ts`**

```ts
import { defineConfig } from "@eslint/config-helpers";
export default defineConfig();
```

**`node_modules/@eslint/config-helpers/index.d.ts`**

```ts
export type Config = import("@eslint/core").ConfigObject;
export function defineConfig(): Config;
```

**`node_modules/@eslint/config-helpers/node_modules/@eslint/core/index.d.ts`**

```ts
export interface ConfigObject {}
```

**`tsconfig.json`**

```json
{
"compilerOptions": {
"composite": true
}
}
```

(No other files are needed for this test case; there’s nothing else in `node_modules`.)

### 🙁 Actual behavior

No error.

### 🙂 Expected behavior

`eslint.config.ts(2,1): error TS2742: The inferred type of 'default' cannot be named without a reference to '@eslint/config-helpers/node_modules/@eslint/core'. This is likely not portable. A type annotation is necessary.`

### Additional information about the issue

In eslint/rewrite#283 I reported an unexpected error TS2742 when using the `defineConfig` function from ESLint. I reduced this test case to a clear TypeScript issue, which I’m reporting as requested in https://github.com/microsoft/TypeScript/issues/42873#issuecomment-2065572017.

This change makes the error disappear:

```diff
--- a/node_modules/eslint/node_modules/@eslint/config-helpers/index.d.ts
+++ b/node_modules/eslint/node_modules/@eslint/config-helpers/index.d.ts
@@ -1,2 +1,3 @@
-export type Config = import("@eslint/core").ConfigObject;
+import { ConfigObject as Config } from "@eslint/core";
+export { Config };
export function defineConfig(): Config;
```

However, in the real `@eslint/config-helpers` package, the line `export type Config = import("@eslint/core").ConfigObject` is generated by `tsc` from JSDoc `/** @typedef {import("@eslint/core").ConfigObject} Config */`, and there doesn’t seem to be a way to generate an equivalent change from JSDoc.

In any case, such a change shouldn’t be necessary. TypeScript ought to recognize that `export type Config = import("@eslint/core").ConfigObject` is already sufficient to allow the `defineConfig` return type to be named.

在启用 composite 的情况下，复现 eslint.config.ts、node_modules/@eslint/config-helpers/index.d.ts 和 tsconfig.json 中的案例。调查编译器在使用导入的 Config 别名时如何命名推断出的默认类型；当精简示例无需修改包即可报告预期的 TS2742 诊断时，即表示完成。

由索引模型根据 Issue 内容生成。