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Showing content from https://github.com/microsoft/TypeScript/issues/57735 below:

ESM `X.test` which have zero export statement, should be sub type of ESM `X` which have at least one export statement · Issue #57735 · microsoft/TypeScript · GitHub

• dynamic import

• type union

• no export

• export {}

• export default {}

No response

reproduce.ts

async function optionalImport(id: string) {
  switch (id) {
    case 'a':
      return await import('./a.js')
    case 'a.test':
      return await import('./a.test.js')
  }

  throw new Error()
}

export { optionalImport }

a.ts

• When a.test.ts

import { foo } from './a.js'
describe('reproduce', () => { it('reproduce', () => { foo }) })

type is

function optionalImport(id: string): Promise<typeof import("/path/to/reproduce/a.test")>

• When a.test.ts

import { foo } from './a.js'
describe('reproduce', () => { it('reproduce', () => { foo }) })
export {}

type is

function optionalImport(id: string): Promise<typeof import("/path/to/reproduce/a.test")>

• When a.test.ts

import { foo } from './a.js'
describe('reproduce', () => { it('reproduce', () => { foo }) })
export default {}

type is

function optionalImport(id: string): Promise<typeof import("/path/to/reproduce/a") | typeof import("/path/to/reproduce/a.test")>

When a.test.ts

import { foo } from './a.js'
describe('reproduce', () => { it('reproduce', () => { foo }) })

type is

function optionalImport(id: string): Promise<typeof import("/path/to/reproduce/a") | typeof import("/path/to/reproduce/a.test")>

No response

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