Function createWriteStream

test/core.test.js:458–463

(f)

      test('file stream as stdout', async () => {
        const createWriteStream = (f) => {
          const stream = fs.createWriteStream(f)
          return new Promise((resolve) => {
            stream.on('open', () => resolve(stream))
          })
        }
        const file = tempfile()
        const stream = await createWriteStream(file)
        const p = $({ stdio: ['pipe', stream, 'ignore'] })`echo foo`