Nuxt/packages/nuxt3/test/auto-imports.test.ts

import type { AutoImport } from '@nuxt/kit'
import { expect } from 'chai'
import { AutoImportContext, updateAutoImportContext } from '../src/auto-imports/context'
import { TransformPlugin } from '../src/auto-imports/transform'

describe('auto-imports:transform', () => {
  const autoImports: AutoImport[] = [
    { name: 'ref', as: 'ref', from: 'vue' },
    { name: 'computed', as: 'computed', from: 'bar' }
  ]

  const ctx = { autoImports, map: new Map() } as AutoImportContext
  updateAutoImportContext(ctx)

  const transformPlugin = TransformPlugin.raw(ctx, { framework: 'rollup' })
  const transform = (code: string) => transformPlugin.transform.call({ error: null, warn: null }, code, '')

  it('should correct inject', async () => {
    expect(await transform('const a = ref(0)')).to.equal('import { ref } from \'vue\';const a = ref(0)')
    expect(await transform('import { computed as ref } from "foo"; const a = ref(0)')).to.include('import { computed } from \'bar\';')
  })

  it('should ignore existing imported', async () => {
    expect(await transform('import { ref } from "foo"; const a = ref(0)')).to.equal(null)
    expect(await transform('import ref from "foo"; const a = ref(0)')).to.equal(null)
    expect(await transform('import { z as ref } from "foo"; const a = ref(0)')).to.equal(null)
    expect(await transform('let ref = () => {}; const a = ref(0)')).to.equal(null)
    expect(await transform('let { ref } = Vue; const a = ref(0)')).to.equal(null)
    expect(await transform('let [\ncomputed,\nref\n] = Vue; const a = ref(0); const b = ref(0)')).to.equal(null)
  })

  it('should ignore comments', async () => {
    const result = await transform('// import { computed } from "foo"\n;const a = computed(0)')
    expect(result).to.equal('import { computed } from \'bar\';// import { computed } from "foo"\n;const a = computed(0)')
  })
})