now-deployment/node_modules/now/dist/util/handle-error.ts

import bytes from 'bytes';
import info from './output/info';
import errorOutput from './output/error';
import { APIError } from './errors-ts';

export default function handleError(
  error: string | Error | APIError,
  { debug = false } = {}
) {
  // Coerce Strings to Error instances
  if (typeof error === 'string') {
    error = new Error(error);
  }

  if (debug) {
    console.log(`> [debug] handling error: ${error.stack}`);
  }

  if ((<APIError>error).status === 403) {
    console.error(
      errorOutput(
        error.message ||
          'Authentication error. Run `now login` to log-in again.'
      )
    );
  } else if ((<APIError>error).status === 429) {
    // Rate limited: display the message from the server-side,
    // which contains more details
    console.error(errorOutput(error.message));
  } else if ((<APIError>error).code === 'size_limit_exceeded') {
    const { sizeLimit = 0 } = <APIError>error;
    console.error(
      errorOutput(`File size limit exceeded (${bytes(sizeLimit)})`)
    );
  } else if (error.message) {
    console.error(errorOutput(error.message));
  } else if ((<APIError>error).status === 500) {
    console.error(errorOutput('Unexpected server error. Please retry.'));
  } else if ((<APIError>error).code === 'USER_ABORT') {
    info('Aborted');
  } else {
    console.error(
      errorOutput(
        `Unexpected error. Please try again later. (${error.message})`
      )
    );
  }
}