#1438 Global tracing subscriber error on pact-js with Jest when --watch or --watchAll is enabled Issue created by bertrandE ### Software versions • OS: MacOS 14.6.1 • Pact library: @pact-foundation/pact@15.0.1 • Node Version: Node 22.11.0 ### Issue Checklist Please confirm the following: • I have upgraded to the latest • I have the read the FAQs in the Readme • I have triple checked, that there are no unhandled promises in my code and have read the section on intermittent test failures • I have set my log level to debug and attached a log file showing the complete request/response cycle • For bonus points and virtual high fives, I have created a reproduceable git repository (see below) to illustrate the problem ### Expected behaviour When running the tests, no error should be shown. ### Actual behaviour When running the tests using Jest / Pact-js, the following error is reported before (or after?) every test:

Failed to initialise global tracing subscriber - a global default trace dispatcher has already been set

The reference implementation has several places where this could come from: https://github.com/search?q=repo%3Apact-foundation%2Fpact-reference%20set_global_default&type=code This seems to be linked to the

--watch

or

--watchAll

flag as when I run without them, no error is reported. Note that this does not seem to influence the execution of the tests (they run just as well). Am I right to assume that this

global default trace dispatcher

is linked to the telemetry that pact collects and that setting the

PACT_DO_NOT_TRACK =true

env var should disable it? I tried it without success. ### Steps to reproduce I have gathered a minimal reproductible repo here: https://github.com/bertrandE/jest-global-tracing-repro/tree/main Just run

npm run test

. The logs of the execution:

PASS  src/b.pact.jest.ts
  Suite B
    ✓ Test B (349 ms)

Failed to initialise global tracing subscriber - a global default trace dispatcher has already been set
 PASS  src/a.pact.jest.ts
  Suite A
    ✓ Test A (6 ms)

Test Suites: 2 passed, 2 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        1.336 s

### Relevant log files debug.txt pact-foundation/pact-js