Server crashes when throwing inside Cloud Code trigger

[mtrezza]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

Parse Server crashes when throwing inside a Cloud Code trigger. The crash is due to the removal of the UnhandledPromiseRejectionWarning in Node 15. Parse Server handles trowing inside a Cloud Code function differently and returns a Parse error without crashing the server.

Breaking Change

This change is breaking because developers may have implemented their own solution by globally catching unhandled rejections on the node process with:

process.on('unhandledRejection', (reason, promise) => {
  // handle error
});

Steps to reproduce

This test fails:

it('does not crash server when throwing in afterLogout hook', async () => {
    let triggered = false;
    const error = new Error('throw in cloud code');

    Parse.Cloud.afterLogout(() => {
      triggered = true;
      throw error;
    });

    await Parse.User.signUp('user', 'pass');
    const response = await Parse.User.logOut().catch(e => e);
    expect(triggered).toBeTrue();
    expect(response).toBeDefined();
    expect(response.code).toBe(141);
    expect(response.message).toBe(error.message);
  });

However, throwing in a Cloud Code function passes the test:

it('does not crash server when throwing in cloud code function', async () => {
    const error = new Error('throw in cloud code');
    Parse.Cloud.define('hello', () => {
      throw error;
    });

    const response = await Parse.Cloud.run('hello').catch(e => e);
    expect(response).toBeDefined();
    expect(response.code).toBe(141);
    expect(response.message).toBe(error.message);
  });

Actual Outcome

Throwing in trigger crashes server.

Expected Outcome

Throwing in trigger returns Parse error without crashing the server.

Environment

Server

• Parse Server version: 5.3.0-alpha.30

[parse-github-assistant]

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[parseplatformorg]

🎉 This change has been released in version 6.0.0-alpha.5

[parse-github-assistant]

The label state:released-alpha cannot be used in combination with state:breaking.

[parseplatformorg]

🎉 This change has been released in version 6.0.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 6.0.0