Function mergeConfig

packages/vite/src/node/utils.ts:1509–1522

(
  defaults: D extends Function ? never : D,
  overrides: O extends Function ? never : O,
  isRoot = true,
)

}

export function mergeConfig<
  D extends Record<string, any>,
  O extends Record<string, any>,
>(
  defaults: D extends Function ? never : D,
  overrides: O extends Function ? never : O,
  isRoot = true,
): Record<string, any> {
  if (typeof defaults === 'function' || typeof overrides === 'function') {
    throw new Error(`Cannot merge config in form of callback`)
  }

  return mergeConfigRecursively(defaults, overrides, isRoot ? '' : '.')
}

export function mergeAlias(
  a?: AliasOptions,