Function capture

packages/assert/src/lib/assert.test.ts:770–777

(fn: () => void)

})

function capture(fn: () => void): nodeAssert.AssertionError | null {
  try {
    fn()
    return null
  } catch (e) {
    return e as nodeAssert.AssertionError
  }
}

async function captureAsync(fn: () => Promise<void>): Promise<nodeAssert.AssertionError | null> {
  try {