tsconfig `include` not overridden

#It’s either a bug or maybe a wanted functionality. Here are my tsconfig file and plugin options which work well: tsconfig.dist.esm.json:

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "declaration": true,
    "declarationDir": "dist/esm"
  },
  "include": ["src/**/*.ts"]
}

rollup.config.js:

typescript({
  tsconfig: 'tsconfig.dist.esm.json',
  useTsconfigDeclarationDir: true
})

I wanted to rid of tsconfig.dist.esm.json and thus modified rollup.config.js file:

typescript({
  tsconfig: 'tsconfig.dist.esm.json',
  tsconfigOverride: {
    compilerOptions: {
      declaration: true,
      declarationDir: 'dist/esm'
    },
    include: ['src/**/*.ts']
  },
  useTsconfigDeclarationDir: true
})

But it does not work. The plugin does not pay attention to txconfigOverride.compilerOptions.declarationDir option. Would be nice if it could.

[kalitine]

Ok, I see. Yes override confused me. No problem I will preserve my tsconfig.dist.esm.json which extends tsconfig.json and is not a big deal.

[ezolenko]

Ah, yes, that works as coded. Objects and arrays are merged, not replaced. This is a different behavior from tsconfig extends option (and I probably shouldn’t have called it override 😃). Arguably either way is useful in different cases.

You can achieve what you want by creating tsconfig.base.json file without test/**/* in includes (but with all the other common options) and using that for rollup directly. Then create tsconfig.json that extends your base and specifies full include list and use that outside of rollup. (see Configuration inheritance in tsconfig-json)

Doesn’t reduce number of files, but removes duplication.