flipper/desktop/flipper-common/src/utils/errors.tsx

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 */

export function isAuthError(
  err: any,
): err is UserNotSignedInError | UserUnauthorizedError {
  return (
    err instanceof UserNotSignedInError || err instanceof UserUnauthorizedError
  );
}

export function isConnectivityOrAuthError(
  err: any,
): err is ConnectivityError | UserNotSignedInError | UserUnauthorizedError {
  return (
    err instanceof ConnectivityError ||
    isAuthError(err) ||
    String(err).startsWith('Failed to fetch')
  );
}

export class CancelledPromiseError extends Error {
  constructor(msg: string) {
    super(msg);
    this.name = 'CancelledPromiseError';
  }
  name: 'CancelledPromiseError';
}

export class ConnectivityError extends Error {
  constructor(msg: string) {
    super(msg);
    this.name = 'ConnectivityError';
  }
  name: 'ConnectivityError';
}

export class UserUnauthorizedError extends Error {
  constructor(msg: string = 'User unauthorized.') {
    super(msg);
    this.name = 'UserUnauthorizedError';
  }
  name: 'UserUnauthorizedError';
}

export class UserNotSignedInError extends Error {
  constructor(msg: string = 'User not signed in.') {
    super(msg);
    this.name = 'UserNotSignedInError';
  }
  name: 'UserNotSignedInError';
}

declare global {
  interface Error {
    interaction?: unknown;
  }
}

export function isError(obj: any): obj is Error {
  return (
    obj instanceof Error ||
    (obj &&
      obj.name &&
      typeof obj.name === 'string' &&
      obj.message &&
      typeof obj.message === 'string' &&
      obj.stack &&
      typeof obj.stack === 'string')
  );
}

export function getErrorFromErrorLike(e: any): Error | undefined {
  if (Array.isArray(e)) {
    return e.map(getErrorFromErrorLike).find((x) => x);
  } else if (isError(e)) {
    return e;
  } else {
    return undefined;
  }
}

export function getStringFromErrorLike(e: any): string {
  if (Array.isArray(e)) {
    return e.map(getStringFromErrorLike).join(' ');
  } else if (typeof e == 'string') {
    return e;
  } else if (isError(e)) {
    return e.message || e.toString();
  } else {
    try {
      return JSON.stringify(e);
    } catch (e) {
      // Stringify might fail on arbitrary structures
      // Last resort: toString it.
      return '' + e;
    }
  }
}