emitIsolatedDts fails to preserve subsequent function declaration after abstract function conversion

[mingc00]

Describe the bug

When using the emitIsolatedDts option, the subsequent function declaration following an abstract function disappears from the generated .d.ts file. This issue occurs consistently when a function is marked as abstract.

Steps to reproduce:

$ git clone https://github.com/mingc00/swc-dts-bug.git
$ pnpm build
$ cat dist/index.d.ts

Input code

export abstract class Manager {
  protected abstract A(): void;
  
  protected B(): void {
    console.log('B');
  }

  protected C(): void {
    console.log('B');
  }
}

Config

{
  "$schema": "https://swc.rs/schema.json",
  "jsc": {
    "loose": true,
    "parser": {
      "syntax": "typescript"
    },
    "experimental": {
      "emitIsolatedDts": true
    },
    "target": "es2022"
  }
}

Playground link (or link to the minimal reproduction)

https://github.com/mingc00/swc-dts-bug

SWC Info output

Node.js v20.17.0

Operating System:
    Platform: linux
    Arch: x64
    Machine Type: x86_64
    Version: #45-Ubuntu SMP PREEMPT_DYNAMIC Fri Aug 30 12:02:04 UTC 2024
    CPU: (8 cores)
        Models: Intel(R) Xeon(R) Silver 4214R CPU @ 2.40GHz

Binaries:
    Node: 20.17.0
    npm: 10.8.2
    Yarn: N/A
    pnpm: 9.12.2

Relevant Packages:
    @swc/core: 1.7.36
    @swc/helpers: N/A
    @swc/types: N/A


SWC Config:
    output: N/A
    .swcrc path: N/A

Next.js info:
    output: N/A

Expected behavior

index.d.ts should be

export declare abstract class Manager {
    protected abstract A(): void;
    protected B(): void;
    protected C(): void;
}

Actual behavior

export declare abstract class Manager {
    protected abstract A(): void;
    protected C(): void;
}

Version

1.7.36

Additional context

No response

[swc-bot]

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