swc-compile function deepMerge didn't handle array type properly

[非凡少年]

Is there an existing issue for this?

• I have searched the existing issues

Current behavior

If I delacre paths in .swcrc and tsconfig.json at the same time, the deepMerge function in https://github.com/nestjs/nest-cli/blob/1b9ab2641a2e46427bb5e54b5f0f6feda4a65276/lib/compiler/swc/swc-compiler.ts#L205C13-L205C13 will convert source code below:

{
    "paths": [
          "@/*": ["src/*"]
    ]
}

to

{
    "paths": {
      "@/*": {
        "0": "src/*"
      }
    }

}

Due to the above issue, @swc/cli fails to start with an error 'invalid type: map, expected a sequence at line 1 column 560'.

Minimum reproduction code

https://github.com/powerfulyang/api.powerfulyang.com

Steps to reproduce

1. pnpm i
2. pnpm run build

Expected behavior

build successfully.

Package version

10.1.7

NestJS version

10.0.5

Node.js version

18.16.1

In which operating systems have you tested?

• macOS
• Windows
• Linux

Other

This BUG fisrt appear in [@nestjs/cli@10.0.4](feat: auto-populate tsc paths in swc config)

[Kamil Mysliwiec]

Let's track this here #2161