Invalid import path rewrite in declaration file

🔎 Search Terms

"import paths", "imports rewrite"

🕗 Version & Regression Information

• This changed between versions 5.5.4 and 5.6.3

⏯ Repository with repro

https://github.com/MariaSolOs/path-rewrite-bug

💻 Code

The linked repository contains all of the necessary code to reproduce the issue. This is a pnpm monorepo with 4 packages.

mod1 simply exports the following interface and makes it available outside the package:

// mod1/index.ts
export interface Foo {
  foo: string;
}

// mod1/package.json
{
  ...
  "exports": {
    ".": {
      "types": "./dist/index.d.ts",
      "default": "./dist/index.js"
    }
  }
}

mod2 depends on mod1 and exports its types.

// mod2/index.ts
import { Foo } from "mod1";

export const createFoo = (foo: string): Foo => ({ foo });

export type * from "mod1";

// mod2/package.json
{
  ...
  "exports": {
    ".": {
      "types": "./dist/index.d.ts",
      "default": "./dist/index.js"
    }
  },
  "dependencies": {
    "mod1": "workspace:*"
  }
}

mod3 depends on mod2 and exports a simple getFoo function using the imported function from mod2:

// mod3/index.ts
import { createFoo } from "mod2";

export const getFoo = () => createFoo("foo");

// mod3/package.json
{
  ...
  "exports": {
    ".": {
      "types": "./dist/index.d.ts",
      "default": "./dist/index.js"
    }
  },
  "dependencies": {
    "mod2": "workspace:*"
  }
}

Finally, mod4 depends on mod3 and uses getFoo to create another function:

// mod4/index.ts
import { getFoo } from "mod3";

export const foo = getFoo();

// mod4/package.json
{
  ...
  "exports": {
    ".": {
      "types": "./dist/index.d.ts",
      "default": "./dist/index.js"
    }
  },
  "dependencies": {
    "mod3": "workspace:*"
  }
}

🙁 Actual behavior

Because mod3 has an invalid index.d.ts, mod4 fails compilation when doing a lib check of mod3's type declaration files. This is the invalid declaration file from mod3:

export declare const getFoo: () => import("mod1").Foo;
//# sourceMappingURL=index.d.ts.map

🙂 Expected behavior

For the behavior from previous versions of TypeScript to be maintained: Since mod2 re-exports mod1s types, and since mod3 depends on mod2, compiling mod3 should produce this:

export declare const getFoo: () => import("mod2").Foo;
//# sourceMappingURL=index.d.ts.map

Additional information about the issue

No response

リンクされた path-rewrite-bug pnpm モノレポから始め、issue に記載されたバージョンを使って mod1 から mod4 までのパッケージをビルドします。mod3 の生成された dist/index.d.ts を調べ、その宣言が mod1 ではなく mod2 経由で Foo をインポートしているか確認します。生成された宣言が期待される出力と一致し、宣言ファイルを確認した状態で mod4 のコンパイルが成功すれば完了です。