Function extractStack

packages/vite/src/node/build.ts:958–972

* The stack string usually contains a copy of the message at the start of the stack. * If the stack starts with the message, we remove it and just return the stack trace * portion. Otherwise the original stack trace is used.

(e: RollupError)

 * portion. Otherwise the original stack trace is used.
 */
function extractStack(e: RollupError) {
  const { stack, name = 'Error', message } = e

  // If we don't have a stack, not much we can do.
  if (!stack) {
    return stack
  }

  const expectedPrefix = `${name}: ${message}\n`
  if (stack.startsWith(expectedPrefix)) {
    return stack.slice(expectedPrefix.length)
  }

  return stack
}

/**
 * Esbuild code frames have newlines at the start and end of the frame, rollup doesn't