Log incorrectly prints [Circular] for object property when it shares reference with another property in the same object

[brjakab]

Related issues

[REQUIRED] Version info

node: 18.19.0

firebase-functions: 4.6.0

firebase-tools: 12.9.1

firebase-admin: 11.11.0

[REQUIRED] Test case

My function is the following:

import { onCall } from "firebase-functions/v2/https";
import { logger } from "firebase-functions/v2";

export const testFunction = onCall(
  {
    region: "europe-west1",
  },
  (request) => {
    const commonData = { foo: "bar" }
    const obj1 = {
      data: commonData,

    }
    const obj2 = {
      data: commonData,

    }
    logger.debug("TEST 1", { obj1, obj2 })
  }
);

[REQUIRED] Steps to reproduce

• Call the function
• View the logs

[REQUIRED] Expected behavior

When calling the function (e.g. locally) it should log with the json payload:

{
  "obj1": { "data": { "foo": "bar" } },
  "obj2": { "data": { "foo": "bar" } },
  "severity": "DEBUG",
  "message": "TEST 1"
}

[REQUIRED] Actual behavior

Instead it prints the following payload:

{
  "obj1": { "data": { "foo": "bar" } },
  "obj2": { "data": "[Circular]" },
  "severity": "DEBUG",
  "message": "TEST 1"
}

Were you able to successfully deploy your functions?

Yes, I had the same issue when viewing the logs in the log explorer.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[OskarGroth]

Also seeing this issue, trying to log an object that has the same timestamp in createdAt and updatedAt.

[CorieW]

Hi @brjakab,

Thanks for reporting this issue! We’ve received it and are reviewing it. We’ll provide updates as soon as possible.

[CorieW]

I have reproduced this issue using:

• firebase-tools: 13.31.2
• firebase-functions: v6.3.1
• firebase-admin: v13.0.2

[CorieW]

Same problem with firebase-function-python