{
  "compilerOptions": {
    "declaration": true,
    "emitDeclarationOnly": true
  }
}

checker({
  typescript: {
    tsConfig: command === 'build' ? {
      compilerOptions: {
        declaration: true,
        emitDeclarationOnly: true,
     }  : undefined,
  },
}),

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    // These two options are used to emit the *.d.ts files whenever typescript is run.
    // This will happen when "vite build" is run thanks to the vite-plugin-checker.
    // However it requires a separate config file because these options cannot be used
    // in combination with noEmit, which is controlled internally by the plugin.
    "declaration": true,
    "emitDeclarationOnly": true,
    "outDir": "./dist",
  }
}

plugins: [
  // Vite does not emit declaration files when "vite build" is run.
  // Instead, we need to run typescript directly in order to emit the declaration files.
  // Since we are already using vite-plugin-checker for typechecking, we can simply have
  // the same plugin emit the declaration files by using "build mode".
  // When running in "build mode", a separate configuration file must also be used to
  // emit declaration files. This is because the options cannot be used with "noEmit",
  // which is controlled internally by vite-plugin-checker any time buildMode is not true.
  // @see https://github.com/vitejs/vite/issues/3461
  // @see https://vite-plugin-checker.netlify.app/checkers/typescript.html
  // @see https://github.com/fi3ework/vite-plugin-checker/pull/186
  checker({
    typescript: {
      buildMode: command === 'build' ? true : false,
      tsconfigPath: command === 'build' ? 'tsconfig.build.json' : 'tsconfig.json',
    },
  }),
],