index.test.ts

import { nextBuild } from 'next-test-utils'
import path from 'path'

describe('Exported runtimes value validation', () => {
  test('fails to build on malformed input', async () => {
    const result = await nextBuild(
      path.resolve(__dirname, './invalid-runtime/app'),
      undefined,
      { stdout: true, stderr: true }
    )
    expect(result).toMatchObject({
      code: 1,
      stderr: expect.stringContaining(
        `Invalid enum value. Expected 'edge' | 'experimental-edge' | 'nodejs', received 'something-odd'`
      ),
    })
  })

  test('warns on unrecognized runtimes value', async () => {
    const result = await nextBuild(
      path.resolve(__dirname, './unsupported-syntax/app'),
      undefined,
      { stdout: true, stderr: true }
    )

    // The build should fail to prevent unexpected behavior
    expect(result.code).toBe(1)

    // Template Literal with Expressions
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/template-literal-with-expressions"'
      )
    )
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unsupported template literal with expressions at "config.runtime".'
      )
    )
    // Binary Expression
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/binary-expression"'
      )
    )
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unsupported node type "BinaryExpression" at "config.runtime"'
      )
    )
    // Spread Operator within Object Expression
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/object-spread-operator"'
      )
    )
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unsupported spread operator in the Object Expression at "config.runtime"'
      )
    )
    // Spread Operator within Array Expression
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/array-spread-operator"'
      )
    )
    // ensure only 1 occurrence of the log
    expect(
      result.stderr.match(/field in route "\/array-spread-operator"/g)?.length
    ).toBe(1)

    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unsupported spread operator in the Array Expression at "config.runtime"'
      )
    )
    // Unknown Identifier
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/invalid-identifier"'
      )
    )
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unknown identifier "runtime" at "config.runtime".'
      )
    )
    // Unknown Expression Type
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/unsupported-value-type"'
      )
    )
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unsupported node type "CallExpression" at "config.runtime"'
      )
    )
    // Unknown Object Key
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Next.js can\'t recognize the exported `config` field in route "/unsupported-object-key"'
      )
    )
    expect(result.stderr).toEqual(
      expect.stringContaining(
        'Unsupported key type "Computed" in the Object Expression at "config.runtime"'
      )
    )
  })
})