TS2742: The inferred type of 'X' cannot be named without a reference

[Aliaksandr-Kasko-JazzTeam]

🔎 Search Terms

ts2742, inferred type, bufbuild, protobuf, es, proto3

🕗 Version & Regression Information

• This changed between versions 5.6.3 and 5.7.x

⏯ Playground Link

No response

💻 Code

🙁 Actual behavior

When using proto files with enums generated with @bufbuild/protoc-gen-es we've got this error on project build with typescript 5.7.x.

error TS2742: The inferred type of 'Price' cannot be named without a reference to '../../../../node_modules/@bufbuild/protobuf/dist/esm/private/enum.js'. This is likely not portable. A type annotation is necessary.

58 export const Price = /*@__PURE__*/ proto3.makeEnum(
                ~~~~~

🙂 Expected behavior

Project builds successfull with TypeScript <= 5.6.3.

Additional information about the issue

No response

[Andarist]

Project builds successfull with TypeScript <= 5.6.3.

What's the emitted declaration for Price there?

[Aliaksandr-Kasko-JazzTeam]

@Andarist its enum generated from proto file

...
enum Price {
  PRICE_UNSPECIFIED = 0;
  PRICE_PAID = 1;
  PRICE_FREE = 2;
}
...

[Andarist]

This error is raised on:

export const Price = /*@__PURE__*/ proto3.makeEnum(

when attempting to generate a .d.ts for the containing file. I wonder what TS put before at this position:

// generated.d.ts
export declare const Price: ???

[Aliaksandr-Kasko-JazzTeam]

in d.ts file generated by @bufbuild/protoc-gen-es
buf.gen.yaml

version: v1
plugins:
  - plugin: es
    out: src/protos
    opt: target=js+dts
  - plugin: connect-es
    out: src/protos
    opt:
      - target=js+dts

I see next lines

export declare enum Price {
  /**
   * @generated from enum value: PRICE_UNSPECIFIED = 0;
   */
  UNSPECIFIED = 0,

  /**
   * @generated from enum value: PRICE_PAID = 1;
   */
  PAID = 1,

  /**
   * @generated from enum value: PRICE_FREE = 2;
   */
  FREE = 2,
}

when I build project with tsc (typescript 5.6.3) then in dist folder d.ts proto file looks like:

export const Price: import("../../../../node_modules/@bufbuild/protobuf/dist/esm/private/enum.js").EnumObject;

I don't know what else you want from me.

[Andarist]

I was interested exactly in this information:

export const Price: import("../../../../node_modules/@bufbuild/protobuf/dist/esm/private/enum.js").EnumObject;

Thank you for providing it.

To be fair, this emitted declaration wasn't really that portable in the first place. I don't know what changed in which PR but an emitted type like this is sus.

To address this issue I'd recommend doing this:

• adding a dependency on @bufbuild/protobuf. Presumably this is a dependency of your dependency (a so-called transitive dependency)
• making sure that EnumObject can be imported from @bufbuild/protobuf
• try to annotate const Price: ? manually. If you can't do it manually then the compiler won't be able to do so either

[RyanCavanaugh]

See #58176 (comment) and #42873 (comment)

[typescript-bot]

This issue has been marked as "Not a Defect" and has seen no recent activity. It has been automatically closed for house-keeping purposes.