Function captureRun

cli/src/framework/run.test.ts:61–91

(tree: CommandTree, argv: string[])

}

async function captureRun(tree: CommandTree, argv: string[]): Promise<Captured> {
  const captured: Captured = { stdout: '', stderr: '', exit: undefined }
  const origStdout = process.stdout.write.bind(process.stdout)
  const origStderr = process.stderr.write.bind(process.stderr)
  const origExit = process.exit.bind(process)

  process.stdout.write = ((chunk: string | Uint8Array) => {
    captured.stdout += typeof chunk === 'string' ? chunk : new TextDecoder().decode(chunk)
    return true
  }) as typeof process.stdout.write

  process.stderr.write = ((chunk: string | Uint8Array) => {
    captured.stderr += typeof chunk === 'string' ? chunk : new TextDecoder().decode(chunk)
    return true
  }) as typeof process.stderr.write

  process.exit = ((code?: number) => {
    captured.exit = code
    // do not throw; the catch block should `return` after exit
  }) as typeof process.exit

  try {
    await run(tree, argv)
  }
  finally {
    process.stdout.write = origStdout
    process.stderr.write = origStderr
    process.exit = origExit
  }
  return captured
}

function makeTree(cmd: CommandConstructor): CommandTree {
  return { cmd: { command: cmd, subcommands: {} } }