duplicate emit /// <reference types="node" />

[bluelovers]

Bug Report

🔎 Search Terms

🕗 Version & Regression Information

Version 4.7.0-dev.20220305

• This is a crash
• This changed between versions ______ and _______
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________
• I was unable to test this on prior versions because _______

⏯ Playground Link

Playground link with relevant code

💻 Code

// We can quickly address your report if:
//  - The code sample is short. Nearly all TypeScript bugs can be demonstrated in 20-30 lines of code!
//  - It doesn't use external libraries. These are often issues with the type definitions rather than TypeScript bugs.
//  - The incorrectness of the behavior is readily apparent from reading the sample.
// Reports are slower to investigate if:
//  - We have to pare too much extraneous code.
//  - We have to clone a large repo and validate that the problem isn't elsewhere.
//  - The sample is confusing or doesn't clearly demonstrate what's wrong.

🙁 Actual behavior

bluelovers/ws-iconv@c039e94

https://github.com./bluelovers/ws-iconv/blob/c039e942f8562c9fdbba4e8d50c19afc20cc687f/packages/%40lazy-node/readlines/lib/types.d.ts

/// <reference types="node" />
/// <reference types="node" />
/**
 * Created by user on 2020/5/29.
 */
import { PathLike } from 'fs';
export interface IOptions {
    readChunk?: number;
    newLineCharacter?: INewLineCharacter;
}
export declare const enum EnumNewLineCharacter {
    LF = 10,
    CR = 13
}
export declare type IPathLike = PathLike | number;
export declare type INewLineCharacter = string | number | EnumNewLineCharacter | (string | number | EnumNewLineCharacter)[] | Buffer;

🙂 Expected behavior

/// <reference types="node" />
/**
 * Created by user on 2020/5/29.
 */
import { PathLike } from 'fs';
export interface IOptions {
    readChunk?: number;
    newLineCharacter?: INewLineCharacter;
}
export declare const enum EnumNewLineCharacter {
    LF = 10,
    CR = 13
}
export declare type IPathLike = PathLike | number;
export declare type INewLineCharacter = string | number | EnumNewLineCharacter | (string | number | EnumNewLineCharacter)[] | Buffer;

[Silic0nS0ldier]

Same behaviour observed under 4.7.4.

Smallest repro I could muster follows.

// src/mod.ts
type ContainerOpts = {
  readonly env: NodeJS.ProcessEnv,
  readonly stderr?: readonly NodeJS.WritableStream[],
};

// dist/mod.d.ts
/// <reference types="node" />
/// <reference types="node" />
declare type ContainerOpts = {
    readonly env: NodeJS.ProcessEnv;
    readonly stderr?: readonly NodeJS.WritableStream[];
};

// tsconfig.json
{
  "compilerOptions": {
    "module": "CommonJS",
    "moduleResolution": "node",
    "target": "ES2020",
    "lib": ["ES2020"]
    "strict": true,
    "declaration": true,
    "outDir": "dist"
  },
  "include": [
    "src"
  ]
}