import { readFileSync } from 'node:fs'
import { describe, expect, it } from 'vitest'

// `next build` rewrites tsconfig.json when the values differ from what Next 16
// mandates (jsx: react-jsx, .next/dev/types in include), dirtying the checkout on
// every build. The shipped file must already hold them.
const tsconfig = JSON.parse(readFileSync(new URL('../tsconfig.json', import.meta.url), 'utf8')) as {
  compilerOptions: { jsx?: string }
  include: string[]
}

describe('tsconfig holds the values Next 16 mandates', () => {
  it('uses the React automatic runtime jsx setting', () => {
    expect(tsconfig.compilerOptions.jsx).toBe('react-jsx')
  })

  it('includes the dev types directory', () => {
    expect(tsconfig.include).toContain('.next/dev/types/**/*.ts')
  })
})