Files
react/packages/react-devtools-shared
Ruslan Lesiutin 9f4e4611ea fix: add Error prefix to Error objects names (#30969)
This fixes printing Error objects in Chrome DevTools.

I've observed that Chrome DevTools is not source mapping and linkifying
URLs, when was running this on larger apps. Chrome DevTools talks to V8
via Chrome DevTools protocol, every object has a corresponding
[`RemoteObject`](https://chromedevtools.github.io/devtools-protocol/tot/Runtime/#type-RemoteObject).

When Chrome DevTools sees that Error object is printed in the console,
it will try to prettify it. `description` field of the corresponding
`RemoteObject` for the `Error` JavaScript object is a combination of
`Error` `name`, `message`, `stack` fields. This is not just a raw
`stack` field, so our prefix for this field just doesn't work. [V8 is
actually filtering out first line of the `stack` field, it only keeps
the stack frames as a string, and then this gets prefixed by `name` and
`message` fields, if they are
available](https://source.chromium.org/chromium/chromium/src/+/main:v8/src/inspector/value-mirror.cc;l=252-311;drc=bdc48d1b1312cc40c00282efb1c9c5f41dcdca9a?fbclid=IwZXh0bgNhZW0CMTEAAR1tMm5YC4jqowObad1qXFT98X4RO76CMkCGNSxZ8rVsg6k2RrdvkVFL0i4_aem_e2fRrqotKdkYIeWlJnk0RA).
As an illustration, this:
```
const fakeError = new Error('');
fakeError.name = 'Stack';
fakeError.stack = 'Error Stack:' + stack;
```

will be formatted by `V8` as this `RemoteObject`:
```
{
  ...
  description: 'Stack: ...',
  ...
}
```

Notice that there is no `Error` prefix, that was previously added.
Because of this, [Chrome DevTools won't even try to symbolicate the
stack](https://github.com/ChromeDevTools/devtools-frontend/blob/ee4729d2ccdf5c6715ee40e6697f5464829e3f9a/front_end/panels/console/ErrorStackParser.ts#L33-L35),
because it doesn't have such prefix.
2024-09-16 17:43:40 +01:00
..
2022-03-16 11:37:10 -04:00

This directory contains code shared between several DevTools packages:

  • /packages/react-devtools-core
  • /packages/react-devtools-extensions
  • /packages/react-devtools-inline

It is not published or released anywhere directly.